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IMPORTANT NOTES(Please Read Before Purchase!): This BV5900 Does NOT work with Verizon, Sprint, Boost Mobile or U.S.Cellular! It CAN work with GSM Carriers like AT&T, T-mobile, Metro PCS and Cricket Wireless! Please Confirm Your SIM Card’s frequency bands are included in below Supported Bands Before Order: – 2G GSM: B2/B3/B5/B8
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– Model: Blackview BV5900 Unlocked Rugged Cell Phone
– Screen Size: 5.7 inches HD + IPS full screen
– Watetproof level: IP68 Waterproof
– OS: Android 10
– CPU: MT6761 Quad-Core 4*2.0GHz
– Battery: 5580mAh
– Storage: 3GB RAM+32GB ROM(128GB TF Card Supported )
– Camera: Rear camera: 13MP+0.3MP; Front camera: 5MP
– Dual SIM Slot: 2 Nano SIM card OR 1 Nano SIM card + TF card(Up to 128G,not included)
– Weight: 0.59 lb / 268g
– Supports: NFC/ GPS/ WIFI/ Bluetooth 4.2/ FM/ Compass/ Gyroscope/ Magnetic/ Face Recognition/ OTG/ 3.5mm earphone
– This Blackview BV5900 can survive from 5-feet DROPPING, Half hour IMMERSION under 5 feet of water and resist 100% of DUST (Please make sure those rubber plugs are plugged tightly ). Moreover, it can work normally in the temperature range of -30°C (-22°F) to 50°C (122°F).
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A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally-spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (Vertical TakeOff and Landing) aircraft cannot perform.
In 1942 the Sikorsky R-4 became the first helicopter to reach full-scale production.
Although most earlier designs used more than one main rotors, the configuration of a single main rotor (monocopter) accompanied by a vertical anti-torque tail rotor has become the most common helicopter configuration. Twin-main rotor helicopters (bicopters), in either tandem or transverse rotors configurations, are also in use due to their greater payload capacity than the monorotor design. Coaxial-rotor helicopters, tiltrotor aircraft, and compound helicopters are all flying today. Quadrotor helicopters (quadcopters) were pioneered as early as 1907 in France, and other types of multicopters have been developed for specialized applications such as drones.
The English word helicopter is adapted from the French word hélicoptère, coined by Gustave Ponton d’Amécourt in 1861, which originates from the Greek helix (ἕλιξ) "helix, spiral, whirl, convolution" and pteron (πτερόν) "wing". English language nicknames for "helicopter" include "chopper", "copter", "heli", and "whirlybird". In the United States military, the common slang is "helo" pronounced with a long "e".
A helicopter, sometimes referred to in slang as a "chopper", is a type of rotorcraft in which lift and thrust are supplied by one or more horizontally-spinning rotors. By contrast the autogyro (or gyroplane) and gyrodyne have a free-spinning rotor for all or part of the flight envelope, relying on a separate thrust system to propel the craft forwards, so that the airflow sets the rotor spinning to provide lift. The compound helicopter also has a separate thrust system, but continues to supply power to the rotor throughout normal flight.
Main article: Helicopter rotor
The rotor system, or more simply rotor, is the rotating part of a helicopter that generates lift. A rotor system may be mounted horizontally, as main rotors are, providing lift vertically, or it may be mounted vertically, such as a tail rotor, to provide horizontal thrust to counteract torque from the main rotors. The rotor consists of a mast, hub and rotor blades.
The mast is a cylindrical metal shaft that extends upwards from the transmission. At the top of the mast is the attachment point for the rotor blades called the hub. Main rotor systems are classified according to how the rotor blades are attached and move relative to the hub. There are three basic types: hingeless, fully articulated, and teetering; although some modern rotor systems use a combination of these.
Most helicopters have a single main rotor, but torque created by its aerodynamic drag must be countered by an opposed torque. The design that Igor Sikorsky settled on for his VS-300 was a smaller tail rotor. The tail rotor pushes or pulls against the tail to counter the torque effect, and this has become the most common configuration for helicopter design, usually at the end of a tail boom.
MD Helicopters 520N NOTAR
Some helicopters use other anti-torque controls instead of the tail rotor, such as the ducted fan (called Fenestron or FANTAIL) and NOTAR. NOTAR provides anti-torque similar to the way a wing develops lift through the use of the Coandă effect on the tail boom.
The use of two or more horizontal rotors turning in opposite directions is another configuration used to counteract the effects of torque on the aircraft without relying on an anti-torque tail rotor. This allows the power normally required to be diverted for the tail rotor to be applied fully to the main rotors, increasing the aircraft’s power efficiency and lifting capacity. There are several common configurations that use the counter-rotating effect to benefit the rotorcraft:
Tandem rotors are two counter-rotating rotors with one mounted behind the other.
Transverse rotors are pair of counter-rotating rotors transversely mounted at the ends of fixed wings or outrigger structures. Now used on tiltrotors, some early model helicopters had used them.
Coaxial rotors are two counter-rotating rotors mounted one above the other with the same axis.
Intermeshing rotors are two counter-rotating rotors mounted close to each other at a sufficient angle to let the rotors intermesh over the top of the aircraft without colliding.
Quadcopters have four rotors often with parallel axes (sometimes rotating in the same direction with tilted axes) which are commonly used on model aircraft.
Tip jet designs let the rotor push itself through the air and avoid generating torque.
The turbine engine for CH-53 Sea Stallion helicopter
Main articles: Aircraft engine and Turboshaft
The number, size and type of engine(s) used on a helicopter determines the size, function and capability of that helicopter design. The earliest helicopter engines were simple mechanical devices, such as rubber bands or spindles, which relegated the size of helicopters to toys and small models. For a half century before the first airplane flight, steam engines were used to forward the development of the understanding of helicopter aerodynamics, but the limited power did not allow for manned flight. The introduction of the internal combustion engine at the end of the 19th century became the watershed for helicopter development as engines began to be developed and produced that were powerful enough to allow for helicopters able to lift humans.
Early helicopter designs utilized custom-built engines or rotary engines designed for airplanes, but these were soon replaced by more powerful automobile engines and radial engines. The single, most-limiting factor of helicopter development during the first half of the 20th century was that the amount of power produced by an engine was not able to overcome the engine’s weight in vertical flight. This was overcome in early successful helicopters by using the smallest engines available. When the compact, flat engine was developed, the helicopter industry found a lighter-weight powerplant easily adapted to small helicopters, although radial engines continued to be used for larger helicopters.
Turbine engines revolutionized the aviation industry; and the turboshaft engine for helicopter use, pioneered in December 1951 by the aforementioned Kaman K-225, finally gave helicopters an engine with a large amount of power and a low weight penalty. Turboshafts are also more reliable than piston engines, especially when producing the sustained high levels of power required by a helicopter. The turboshaft engine was able to be scaled to the size of the helicopter being designed, so that all but the lightest of helicopter models are powered by turbine engines today.
Special jet engines developed to drive the rotor from the rotor tips are referred to as tip jets. Tip jets powered by a remote compressor are referred to as cold tip jets, while those powered by combustion exhaust are referred to as hot tip jets. An example of a cold jet helicopter is the Sud-Ouest Djinn, and an example of the hot tip jet helicopter is the YH-32 Hornet.
Some radio-controlled helicopters and smaller, helicopter-type unmanned aerial vehicles, use electric motors or motorcycle engines. Radio-controlled helicopters may also have piston engines that use fuels other than gasoline, such as nitromethane. Some turbine engines commonly used in helicopters can also use biodiesel instead of jet fuel.
There are also human-powered helicopters.
Main article: Helicopter flight controls
Controls from a Bell 206
A helicopter has four flight control inputs. These are the cyclic, the collective, the anti-torque pedals, and the throttle. The cyclic control is usually located between the pilot’s legs and is commonly called the cyclic stick or just cyclic. On most helicopters, the cyclic is similar to a joystick. However, the Robinson R22 and Robinson R44 have a unique teetering bar cyclic control system and a few helicopters have a cyclic control that descends into the cockpit from overhead.
The control is called the cyclic because it changes cyclic pitch of the main blades. The result is to tilt the rotor disk in a particular direction, resulting in the helicopter moving in that direction. If the pilot pushes the cyclic forward, the rotor disk tilts forward, and the rotor produces a thrust in the forward direction. If the pilot pushes the cyclic to the side, the rotor disk tilts to that side and produces thrust in that direction, causing the helicopter to hover sideways.
The collective pitch control or collective is located on the left side of the pilot’s seat with a settable friction control to prevent inadvertent movement. The collective changes the pitch angle of all the main rotor blades collectively (i.e. all at the same time) and independently of their position. Therefore, if a collective input is made, all the blades change equally, and the result is the helicopter increasing or decreasing in altitude.
A swashplate controls the collective and cyclic pitch of the main blades. The swashplate moves up and down, along the main shaft, to change the pitch of both blades. This causes the helicopter to push air downward or upward, depending on the angle of attack. The swashplate can also change its angle to move the blades angle forwards or backwards, or left and right, to make the helicopter move in those directions.
The anti-torque pedals are located in the same position as the rudder pedals in a fixed-wing aircraft, and serve a similar purpose, namely to control the direction in which the nose of the aircraft is pointed. Application of the pedal in a given direction changes the pitch of the tail rotor blades, increasing or reducing the thrust produced by the tail rotor and causing the nose to yaw in the direction of the applied pedal. The pedals mechanically change the pitch of the tail rotor altering the amount of thrust produced.
Helicopter rotors are designed to operate in a narrow range of RPM. The throttle controls the power produced by the engine, which is connected to the rotor by a fixed ratio transmission. The purpose of the throttle is to maintain enough engine power to keep the rotor RPM within allowable limits so that the rotor produces enough lift for flight. In single-engine helicopters, the throttle control is a motorcycle-style twist grip mounted on the collective control, while dual-engine helicopters have a power lever for each engine.
A compound helicopter has an additional system for thrust and, typically, small stub fixed wings. This offloads the rotor in cruise, which allows its rotation to be slowed down, thus increasing the maximum speed of the aircraft. The Lockheed AH-56A Cheyenne diverted up to 90% of its engine power to a pusher propeller during forward flight.
Helicopter hovering over boat in rescue exercise
There are three basic flight conditions for a helicopter: hover, forward flight and the transition between the two.
Hovering is the most challenging part of flying a helicopter. This is because a helicopter generates its own gusty air while in a hover, which acts against the fuselage and flight control surfaces. The end result is constant control inputs and corrections by the pilot to keep the helicopter where it is required to be. Despite the complexity of the task, the control inputs in a hover are simple. The cyclic is used to eliminate drift in the horizontal plane, that is to control forward and back, right and left. The collective is used to maintain altitude. The pedals are used to control nose direction or heading. It is the interaction of these controls that makes hovering so difficult, since an adjustment in any one control requires an adjustment of the other two, creating a cycle of constant correction.
Transition from hover to forward flight
As a helicopter moves from hover to forward flight it enters a state called translational lift which provides extra lift without increasing power. This state, most typically, occurs when the airspeed reaches approximately 16–24 knots (30–44 km/h; 18–28 mph), and may be necessary for a helicopter to obtain flight.
In forward flight a helicopter’s flight controls behave more like those of a fixed-wing aircraft. Displacing the cyclic forward will cause the nose to pitch down, with a resultant increase in airspeed and loss of altitude. Aft cyclic will cause the nose to pitch up, slowing the helicopter and causing it to climb. Increasing collective (power) while maintaining a constant airspeed will induce a climb while decreasing collective will cause a descent. Coordinating these two inputs, down collective plus aft cyclic or up collective plus forward cyclic, will result in airspeed changes while maintaining a constant altitude. The pedals serve the same function in both a helicopter and a fixed-wing aircraft, to maintain balanced flight. This is done by applying a pedal input in whichever direction is necessary to center the ball in the turn and bank indicator.
An HH-65 Dolphin demonstrating hoist rescue capability
Due to the operating characteristics of the helicopter—its ability to take off and land vertically, and to hover for extended periods of time, as well as the aircraft’s handling properties under low airspeed conditions—it has been chosen to conduct tasks that were previously not possible with other aircraft, or were time- or work-intensive to accomplish on the ground. Today, helicopter uses include transportation of people and cargo, military uses, construction, firefighting, search and rescue, tourism, medical transport, law enforcement, agriculture, news and media, and aerial observation, among others.
A helicopter used to carry loads connected to long cables or slings is called an aerial crane. Aerial cranes are used to place heavy equipment, like radio transmission towers and large air conditioning units, on the tops of tall buildings, or when an item must be raised up in a remote area, such as a radio tower raised on the top of a hill or mountain. Helicopters are used as aerial cranes in the logging industry to lift trees out of terrain where vehicles cannot travel and where environmental concerns prohibit the building of roads. These operations are referred to as longline because of the long, single sling line used to carry the load.
The largest single non-combat helicopter operation in history was the disaster management operation following the 1986 Chernobyl nuclear disaster. Hundreds of pilots were involved in airdrop and observation missions, making dozens of sorties a day for several months.
"Helitack" is the use of helicopters to combat wildland fires. The helicopters are used for aerial firefighting (water bombing) and may be fitted with tanks or carry helibuckets. Helibuckets, such as the Bambi bucket, are usually filled by submerging the bucket into lakes, rivers, reservoirs, or portable tanks. Tanks fitted onto helicopters are filled from a hose while the helicopter is on the ground or water is siphoned from lakes or reservoirs through a hanging snorkel as the helicopter hovers over the water source. Helitack helicopters are also used to deliver firefighters, who rappel down to inaccessible areas, and to resupply firefighters. Common firefighting helicopters include variants of the Bell 205 and the Erickson S-64 Aircrane helitanker.
A Bell 205 dropping water onto a fire
Helicopters are used as air ambulances for emergency medical assistance in situations when an ambulance cannot easily or quickly reach the scene, or cannot transport the patient to a medical facility in time. Helicopters are also used when patients need to be transported between medical facilities and air transportation is the most practical method. An air ambulance helicopter is equipped to stabilize and provide limited medical treatment to a patient while in flight. The use of helicopters as air ambulances is often referred to as "MEDEVAC", and patients are referred to as being "airlifted", or "medevaced". This use was pioneered in the Korean War, when time to reach a medical facility was reduced to three hours from the eight hours needed in World War II, and further reduced to two hours by the Vietnam War.
Police departments and other law enforcement agencies use helicopters to pursue suspects. Since helicopters can achieve a unique aerial view, they are often used in conjunction with police on the ground to report on suspects’ locations and movements. They are often mounted with lighting and heat-sensing equipment for night pursuits.
Military forces use attack helicopters to conduct aerial attacks on ground targets. Such helicopters are mounted with missile launchers and miniguns. Transport helicopters are used to ferry troops and supplies where the lack of an airstrip would make transport via fixed-wing aircraft impossible. The use of transport helicopters to deliver troops as an attack force on an objective is referred to as "air assault". Unmanned aerial systems (UAS) helicopter systems of varying sizes are developed by companies for military reconnaissance and surveillance duties. Naval forces also use helicopters equipped with dipping sonar for anti-submarine warfare, since they can operate from small ships.
Oil companies charter helicopters to move workers and parts quickly to remote drilling sites located at sea or in remote locations. The speed advantage over boats makes the high operating cost of helicopters cost-effective in ensuring that oil platforms continue to operate. Various companies specialize in this type of operation.
NASA is developing the Mars Helicopter, a 1.8 kg (4.0 lb) helicopter to be launched to survey Mars (along with a rover) in 2020. Given that the Martian atmosphere is 100 times thinner than that of Earth’s, its two blades will spin at close to 3,000 revolutions a minute, approximately 10 times faster than that of a terrestrial helicopter.
A Sikorsky S-64 Skycrane lifting a prefab house
In 2017, 926 civil helicopters were shipped for $3.68 Billion, led by Airbus Helicopters with $1.87 Billion for 369 rotorcraft, Leonardo Helicopters with $806 Million for 102 (first three-quarters only), Bell Helicopter with $696 Million for 132, then Robinson Helicopter with $161 Million for 305.
By October 2018, the in-service and stored helicopter fleet of 38,570 with civil or government operators was led Robinson Helicopter with 24.7% followed by Airbus Helicopters with 24.4%, then Bell with 20.5 and Leonardo with 8.4%, Russian Helicopters with 7.7%, Sikorsky Aircraft with 7.2%, MD Helicopters with 3.4% and other with 2.2%. The most widespread model is the piston Robinson R44 with 5,600, then the H125/AS350 with 3,600 units, followed by the Bell 206 with 3,400. Most were in North America with 34.3% then in Europe with 28.0% followed by Asia-Pacific with 18.6%, Latin America with 11.6%, Africa with 5.3% and Middle East with 1.7%.
See also: Bamboo-copter, Science and inventions of Leonardo da Vinci, and Leonardo’s aerial screw
The earliest references for vertical flight came from China. Since around 400 BC, Chinese children have played with bamboo flying toys (or Chinese top). This bamboo-copter is spun by rolling a stick attached to a rotor. The spinning creates lift, and the toy flies when released. The 4th-century AD Daoist book Baopuzi by Ge Hong (抱朴子 "Master who Embraces Simplicity") reportedly describes some of the ideas inherent to rotary wing aircraft.
Designs similar to the Chinese helicopter toy appeared in some Renaissance paintings and other works. In the 18th and early 19th centuries Western scientists developed flying machines based on the Chinese toy.
Leonardo’s "aerial screw"
It was not until the early 1480s, when Italian polymath Leonardo da Vinci created a design for a machine that could be described as an "aerial screw", that any recorded advancement was made towards vertical flight. His notes suggested that he built small flying models, but there were no indications for any provision to stop the rotor from making the craft rotate. As scientific knowledge increased and became more accepted, people continued to pursue the idea of vertical flight.
In July 1754, Russian Mikhail Lomonosov had developed a small coaxial modeled after the Chinese top but powered by a wound-up spring device and demonstrated it to the Russian Academy of Sciences. It was powered by a spring, and was suggested as a method to lift meteorological instruments. In 1783, Christian de Launoy, and his mechanic, Bienvenu, used a coaxial version of the Chinese top in a model consisting of contrarotating turkey flight feathers as rotor blades, and in 1784, demonstrated it to the French Academy of Sciences. Sir George Cayley, influenced by a childhood fascination with the Chinese flying top, developed a model of feathers, similar to that of Launoy and Bienvenu, but powered by rubber bands. By the end of the century, he had progressed to using sheets of tin for rotor blades and springs for power. His writings on his experiments and models would become influential on future aviation pioneers. Alphonse Pénaud would later develop coaxial rotor model helicopter toys in 1870, also powered by rubber bands. One of these toys, given as a gift by their father, would inspire the Wright brothers to pursue the dream of flight.
Experimental helicopter by Enrico Forlanini, 1877
In 1861, the word "helicopter" was coined by Gustave de Ponton d’Amécourt, a French inventor who demonstrated a small steam-powered model. While celebrated as an innovative use of a new metal, aluminum, the model never lifted off the ground. D’Amecourt’s linguistic contribution would survive to eventually describe the vertical flight he had envisioned. Steam power was popular with other inventors as well. In 1878 the Italian Enrico Forlanini’s unmanned vehicle, also powered by a steam engine, rose to a height of 12 meters (39 feet), where it hovered for some 20 seconds after a vertical take-off. Emmanuel Dieuaide’s steam-powered design featured counter-rotating rotors powered through a hose from a boiler on the ground. In 1887 Parisian inventor, Gustave Trouvé, built and flew a tethered electric model helicopter.
In July 1901, the maiden flight of Hermann Ganswindt’s helicopter took place in Berlin-Schöneberg; this was probably the first heavier-than-air motor-driven flight carrying humans. A movie covering the event was taken by Max Skladanowsky, but it remains lost.
In 1885, Thomas Edison was given US$1,000 (equivalent to $29,000 today) by James Gordon Bennett, Jr., to conduct experiments towards developing flight. Edison built a helicopter and used the paper for a stock ticker to create guncotton, with which he attempted to power an internal combustion engine. The helicopter was damaged by explosions and one of his workers was badly burned. Edison reported that it would take a motor with a ratio of three to four pounds per horsepower produced to be successful, based on his experiments. Ján Bahýľ, a Slovak inventor, adapted the internal combustion engine to power his helicopter model that reached a height of 0.5 meters (1.6 feet) in 1901. On 5 May 1905, his helicopter reached 4 meters (13 feet) in altitude and flew for over 1,500 meters (4,900 feet). In 1908, Edison patented his own design for a helicopter powered by a gasoline engine with box kites attached to a mast by cables for a rotor, but it never flew.
In 1906, two French brothers, Jacques and Louis Breguet, began experimenting with airfoils for helicopters. In 1907, those experiments resulted in the Gyroplane No.1, possibly as the earliest known example of a quadcopter. Although there is some uncertainty about the date, sometime between 14 August and 29 September 1907, the Gyroplane No. 1 lifted its pilot into the air about 0.6 metres (2 ft) for a minute. The Gyroplane No. 1 proved to be extremely unsteady and required a man at each corner of the airframe to hold it steady. For this reason, the flights of the Gyroplane No. 1 are considered to be the first manned flight of a helicopter, but not a free or untethered flight.
Paul Cornu’s helicopter, 1907
That same year, fellow French inventor Paul Cornu designed and built the Cornu helicopter which used two 6.1-metre (20 ft) counter-rotating rotors driven by a 24 hp (18 kW) Antoinette engine. On 13 November 1907, it lifted its inventor to 0.3 metres (1 ft) and remained aloft for 20 seconds. Even though this flight did not surpass the flight of the Gyroplane No. 1, it was reported to be the first truly free flight with a pilot.[n 1] Cornu’s helicopter completed a few more flights and achieved a height of nearly 2.0 metres (6.5 ft), but it proved to be unstable and was abandoned.
In 1911, Slovenian philosopher and economist Ivan Slokar patented a helicopter configuration.
The Danish inventor Jacob Ellehammer built the Ellehammer helicopter in 1912. It consisted of a frame equipped with two counter-rotating discs, each of which was fitted with six vanes around its circumference. After indoor tests, the aircraft was demonstrated outdoors and made several free take-offs. Experiments with the helicopter continued until September 1916, when it tipped over during take-off, destroying its rotors.
During World War I, Austria-Hungary developed the PKZ, an experimental helicopter prototype, with two aircraft built.
File:Bits & Pieces – BP374 – Test flight of Pescara’s helicopter – 1922 – EYE FLM7760 – OB105716.ogv
Silent film of a test flight of Pescara’s helicopter, 1922. EYE Film Institute Netherlands.
In the early 1920s, Argentine Raúl Pateras-Pescara de Castelluccio, while working in Europe, demonstrated one of the first successful applications of cyclic pitch. Coaxial, contra-rotating, biplane rotors could be warped to cyclically increase and decrease the lift they produced. The rotor hub could also be tilted forward a few degrees, allowing the aircraft to move forward without a separate propeller to push or pull it. Pateras-Pescara was also able to demonstrate the principle of autorotation. By January 1924, Pescara’s helicopter No. 1 was tested but was found to be underpowered and could not lift its own weight. His 2F fared better and set a record. The British government funded further research by Pescara which resulted in helicopter No. 3, powered by a 250-horsepower (190 kW) radial engine which could fly for up to ten minutes.
In March 1923 Time Magazine reported Thomas Edison sent Dr. George de Bothezaat a congratulations for a successful helicopter test flight. Edison wrote, "So far as I know, you have produced the first successful helicopter." The helicopter was tested at McCook’s Field and remained airborne for 2 minutes and 45 seconds at a height of 15 feet.
On 14 April 1924, Frenchman Étienne Oehmichen set the first helicopter world record recognized by the Fédération Aéronautique Internationale (FAI), flying his quadrotor helicopter 360 meters (1,180 ft). On 18 April 1924, Pescara beat Oemichen’s record, flying for a distance of 736 meters (2,415 ft) (nearly 0.80 kilometers or .5 miles) in 4 minutes and 11 seconds (about 13 km/h or 8 mph), maintaining a height of 1.8 meters (6 feet). On 4 May, Oehmichen completed the first one-kilometer (0.62 mi) closed-circuit helicopter flight in 7 minutes 40 seconds with his No. 2 machine.
In the US, George de Bothezat built the quadrotor helicopter de Bothezat helicopter for the United States Army Air Service but the Army cancelled the program in 1924, and the aircraft was scrapped.
Albert Gillis von Baumhauer, a Dutch aeronautical engineer, began studying rotorcraft design in 1923. His first prototype "flew" ("hopped" and hovered in reality) on 24 September 1925, with Dutch Army-Air arm Captain Floris Albert van Heijst at the controls. The controls that van Heijst used were von Baumhauer’s inventions, the cyclic and collective. Patents were granted to von Baumhauer for his cyclic and collective controls by the British ministry of aviation on 31 January 1927, under patent number 265,272.
In 1927, Engelbert Zaschka from Germany built a helicopter, equipped with two rotors, in which a gyroscope was used to increase stability and serves as an energy accumulator for a gliding flight to make a landing. Zaschka’s plane, the first helicopter, which ever worked so successfully in miniature, not only rises and descends vertically, but is able to remain stationary at any height.
In 1928, Hungarian aviation engineer Oszkár Asbóth constructed a helicopter prototype that took off and landed at least 182 times, with a maximum single flight duration of 53 minutes.
In 1930, the Italian engineer Corradino D’Ascanio built his D’AT3, a coaxial helicopter. His relatively large machine had two, two-bladed, counter-rotating rotors. Control was achieved by using auxiliary wings or servo-tabs on the trailing edges of the blades, a concept that was later adopted by other helicopter designers, including Bleeker and Kaman. Three small propellers mounted to the airframe were used for additional pitch, roll, and yaw control. The D’AT3 held modest FAI speed and altitude records for the time, including altitude (18 m or 59 ft), duration (8 minutes 45 seconds) and distance flown (1,078 m or 3,540 ft).
First practical rotorcraft
Spanish aeronautical engineer and pilot Juan de la Cierva invented the autogyro in the early 1920s, becoming the first practical rotorcraft. In 1928, de la Cierva successfully flew an autogyro across the English Channel, from London to Paris. In 1934, an autogyro became the first rotorcraft to successfully take off and land on the deck of a ship. That same year, the autogyro was employed by the Spanish military during the Asturias revolt, becoming the first military deployment of a rotocraft. Autogyros were also employed in New Jersey and Pennsylvania for delivering mail and newspapers prior to the invention of the helicopter. Though lacking true vertical flight capability, work on the autogyro forms the basis for helicopter analysis.
Single lift-rotor success
In the Soviet Union, Boris N. Yuriev and Alexei M. Cheremukhin, two aeronautical engineers working at the Tsentralniy Aerogidrodinamicheskiy Institut (TsAGI or the Central Aerohydrodynamic Institute), constructed and flew the TsAGI 1-EA single lift-rotor helicopter, which used an open tubing framework, a four-blade main lift rotor, and twin sets of 1.8-meter (5.9-foot) diameter, two-bladed anti-torque rotors: one set of two at the nose and one set of two at the tail. Powered by two M-2 powerplants, up-rated copies of the Gnome Monosoupape 9 Type B-2 100 CV output rotary engine of World War I, the TsAGI 1-EA made several low altitude flights. By 14 August 1932, Cheremukhin managed to get the 1-EA up to an unofficial altitude of 605 meters (1,985 feet), shattering d’Ascanio’s earlier achievement. As the Soviet Union was not yet a member of the FAI, however, Cheremukhin’s record remained unrecognized.
Nicolas Florine, a Russian engineer, built the first twin tandem rotor machine to perform a free flight. It flew in Sint-Genesius-Rode, at the Laboratoire Aérotechnique de Belgique (now von Karman Institute) in April 1933, and attained an altitude of six meters (20 feet) and an endurance of eight minutes. Florine chose a co-rotating configuration because the gyroscopic stability of the rotors would not cancel. Therefore, the rotors had to be tilted slightly in opposite directions to counter torque. Using hingeless rotors and co-rotation also minimised the stress on the hull. At the time, it was one of the most stable helicopters in existence.
The Bréguet-Dorand Gyroplane Laboratoire was built in 1933. It was a coaxial helicopter, contra-rotating. After many ground tests and an accident, it first took flight on 26 June 1935. Within a short time, the aircraft was setting records with pilot Maurice Claisse at the controls. On 14 December 1935, he set a record for closed-circuit flight with a 500-meter (1,600-foot) diameter. The next year, on 26 September 1936, Claisse set a height record of 158 meters (518 feet). And, finally, on 24 November 1936, he set a flight duration record of one hour, two minutes and 50 seconds over a 44 kilometers (27 miles) closed circuit at 44.7 kilometers per hour (27.8 mph). The aircraft was destroyed in 1943 by an Allied airstrike at Villacoublay airport.
American single-rotor beginnings
American inventor Arthur M. Young started work on model helicopters in 1928 using converted electric hover motors to drive the rotor head. Young invented the stabilizer bar and patented it shortly after. A mutual friend introduced Young to Lawrence Dale, who once seeing his work asked him to join the Bell Aircraft company. When Young arrived at Bell in 1941, he signed his patent over and began work on the helicopter. His budget was US$250,000 (equivalent to $4.4 million today) to build two working helicopters. In just six months they completed the first Bell Model 1, which spawned the Bell Model 30, later succeeded by the Bell 47.
Birth of an industry
Igor Sikorsky and the first mass-produced helicopter, the Sikorsky R-4, 1944
Heinrich Focke at Focke-Wulf had purchased a license from Cierva Autogiro Company, which according to Frank Kingston Smith Sr., included "the fully controllable cyclic/collective pitch hub system." In return, Cierva Autogiro received a cross-license to build the Focke-Achgelis helicopters. Focke designed the world’s first practical transverse twin-rotor helicopter, the Focke-Wulf Fw 61, which first flew in June 1936. The Fw 61 had flown higher than 8,000 feet (2,400 m) at speeds of 120 miles per hour (190 km/h). Autogiro development was now being bypassed by a focus on helicopters.
During World War II, Nazi Germany used helicopters in small numbers for observation, transport, and medical evacuation. The Flettner Fl 282 Kolibri synchropter—using the same basic configuration as Anton Flettner’s own pioneering Fl 265—was used in the Mediterranean, while the Focke Achgelis Fa 223 Drache twin-rotor helicopter was used in Europe. Extensive bombing by the Allied forces prevented Germany from producing any helicopters in large quantities during the war.
In the United States, Russian-born engineer Igor Sikorsky and Wynn Laurence LePage competed to produce the U.S. military’s first helicopter. LePage received the patent rights to develop helicopters patterned after the Fw 61, and built the XR-1. Meanwhile, Sikorsky settled on a simpler, single rotor design, the VS-300, which turned out to be the first practical single lifting-rotor helicopter design. After experimenting with configurations to counteract the torque produced by the single main rotor, Sikorsky settled on a single, smaller rotor mounted on the tail boom.
Developed from the VS-300, Sikorsky’s R-4 was the first large-scale mass-produced helicopter, with a production order for 100 aircraft. The R-4 was the only Allied helicopter to serve in World War II, primarily for search and rescue (by the USAAF 1st Air Commando Group) in the Burma campaign; in Alaska; and in other areas with harsh terrain. Total production reached 131 helicopters before the R-4 was replaced by other Sikorsky helicopters such as the R-5 and the R-6. In all, Sikorsky produced over 400 helicopters before the end of World War II.
While LePage and Sikorsky built their helicopters for the military, Bell Aircraft hired Arthur Young to help build a helicopter using Young’s two-blade teetering rotor design, which used a weighted stabilizer bar placed at a 90° angle to the rotor blades. The subsequent Model 30 helicopter showed the design’s simplicity and ease of use. The Model 30 was developed into the Bell 47, which became the first helicopter certified for civilian use in the United States. Produced in several countries, the Bell 47 was the most popular helicopter model for nearly 30 years.
See also: Gas turbine and turboshaft
In 1951, at the urging of his contacts at the Department of the Navy, Charles Kaman modified his K-225 synchropter — a design for a twin-rotor helicopter concept first pioneered by Anton Flettner in 1939, with the aforementioned Fl 265 piston-engined design in Germany – with a new kind of engine, the turboshaft engine. This adaptation of the turbine engine provided a large amount of power to Kaman’s helicopter with a lower weight penalty than piston engines, with their heavy engine blocks and auxiliary components. On 11 December 1951, the Kaman K-225 became the first turbine-powered helicopter in the world. Two years later, on 26 March 1954, a modified Navy HTK-1, another Kaman helicopter, became the first twin-turbine helicopter to fly. However, it was the Sud Aviation Alouette II that would become the first helicopter to be produced with a turbine-engine.
Reliable helicopters capable of stable hover flight were developed decades after fixed-wing aircraft. This is largely due to higher engine power density requirements than fixed-wing aircraft. Improvements in fuels and engines during the first half of the 20th century were a critical factor in helicopter development. The availability of lightweight turboshaft engines in the second half of the 20th century led to the development of larger, faster, and higher-performance helicopters. While smaller and less expensive helicopters still use piston engines, turboshaft engines are the preferred powerplant for helicopters today.
A Russian Air Force Kamov Ka-50 uses a coaxial rotor system
Maximum speed limit
There are several reasons a helicopter cannot fly as fast as a fixed-wing aircraft. When the helicopter is hovering, the outer tips of the rotor travel at a speed determined by the length of the blade and the rotational speed. In a moving helicopter, however, the speed of the blades relative to the air depends on the speed of the helicopter as well as on their rotational speed. The airspeed of the advancing rotor blade is much higher than that of the helicopter itself. It is possible for this blade to exceed the speed of sound, and thus produce vastly increased drag and vibration.
At the same time, the advancing blade creates more lift traveling forward, the retreating blade produces less lift. If the aircraft were to accelerate to the air speed that the blade tips are spinning, the retreating blade passes through air moving at the same speed of the blade and produces no lift at all, resulting in very high torque stresses on the central shaft that can tip down the retreating-blade side of the vehicle, and cause a loss of control. Dual counter-rotating blades prevent this situation due to having two advancing and two retreating blades with balanced forces.
Because the advancing blade has higher airspeed than the retreating blade and generates a dissymmetry of lift, rotor blades are designed to "flap" – lift and twist in such a way that the advancing blade flaps up and develops a smaller angle of attack. Conversely, the retreating blade flaps down, develops a higher angle of attack, and generates more lift. At high speeds, the force on the rotors is such that they "flap" excessively, and the retreating blade can reach too high an angle and stall. For this reason, the maximum safe forward airspeed of a helicopter is given a design rating called VNE, velocity, never exceed. In addition, it is possible for the helicopter to fly at an airspeed where an excessive amount of the retreating blade stalls, which results in high vibration, pitch-up, and roll into the retreating blade.
A Eurocopter EC120 helicopter demonstrates its agility with a barrel roll
During the closing years of the 20th century designers began working on helicopter noise reduction. Urban communities have often expressed great dislike of noisy aviation or noisy aircraft, and police and passenger helicopters can be unpopular because of the sound. The redesigns followed the closure of some city heliports and government action to constrain flight paths in national parks and other places of natural beauty.
Helicopters also vibrate; an unadjusted helicopter can easily vibrate so much that it will shake itself apart. To reduce vibration, all helicopters have rotor adjustments for height and weight. Blade height is adjusted by changing the pitch of the blade. Weight is adjusted by adding or removing weights on the rotor head and/or at the blade end caps. Most also have vibration dampers for height and pitch. Some also use mechanical feedback systems to sense and counter vibration. Usually the feedback system uses a mass as a "stable reference" and a linkage from the mass operates a flap to adjust the rotor’s angle of attack to counter the vibration. Adjustment is difficult in part because measurement of the vibration is hard, usually requiring sophisticated accelerometers mounted throughout the airframe and gearboxes. The most common blade vibration adjustment measurement system is to use a stroboscopic flash lamp, and observe painted markings or coloured reflectors on the underside of the rotor blades. The traditional low-tech system is to mount coloured chalk on the rotor tips, and see how they mark a linen sheet. Health and Usage Monitoring Systems (HUMS), provide vibration monitoring and rotor track and balance solutions to limit vibration. Gearbox vibration most often requires a gearbox overhaul or replacement. Gearbox or drive train vibrations can be extremely harmful to a pilot. The most severe being pain, numbness, loss of tactile discrimination and dexterity.
Loss of tail-rotor effectiveness
For a standard helicopter with a single main rotor, the tips of the main rotor blades produce a vortex ring in the air, which is a spiraling and circularly rotating airflow. As the craft moves forward, these vortices trail off behind the craft.
When hovering with a forward diagonal crosswind, or moving in a forward diagonal direction, the spinning vortices trailing off the main rotor blades will align with the rotation of the tail rotor and cause an instability in flight control.
When the trailing vortices colliding with the tail rotor are rotating in the same direction, this causes a loss of thrust from the tail rotor. When the trailing vortices rotate in the opposite direction of the tail rotor, thrust is increased. Use of the foot pedals is required to adjust the tail rotor’s angle of attack, to compensate for these instabilities.
These issues are due to the exposed tail rotor cutting through open air around rear of the vehicle. This issue disappears when the tail is instead ducted, using an internal impeller enclosed in the tail and a jet of high pressure air sideways out of the tail, as the main rotor vortices can not impact the operation of an internal impeller.
Critical wind azimuth
For a standard helicopter with a single main rotor, maintaining steady flight with a crosswind presents an additional flight control problem, where strong crosswinds from certain angles will increase or decrease lift from the main rotors. This effect is also triggered in a no-wind condition when moving the craft diagonally in various directions, depending on the direction of main rotor rotation.
This can lead to a loss of control and a crash or hard landing when operating at low altitudes, due to the sudden unexpected loss of lift, and insufficient time and distance available to recover.
Conventional rotary-wing aircraft use a set of complex mechanical gearboxes to convert the high rotation speed of gas turbines into the low speed required to drive main and tail rotors. Unlike powerplants, mechanical gearboxes cannot be duplicated (for redundancy) and have always been a major weak point in helicopter reliability. In-flight catastrophic gear failures often result in gearbox jamming and subsequent fatalities, whereas loss of lubrication can trigger onboard fire. Another weakness of mechanical gearboxes is their transient power limitation, due to structural fatigue limits. Recent EASA studies point to engines and transmissions as prime cause of crashes just after pilot errors.
By contrast, electromagnetic transmissions do not use any parts in contact; hence lubrication can be drastically simplified, or eliminated. Their inherent redundancy offers good resilience to single point of failure. The absence of gears enables high power transient without impact on service life. The concept of electric propulsion applied to helicopter and electromagnetic drive was brought to reality by Pascal Chretien who designed, built and flew world’s first man-carrying, free-flying electric helicopter. The concept was taken from the conceptual computer-aided design model on 10 September 2010 to the first testing at 30% power on 1 March 2011 – less than six months. The aircraft first flew on 12 August 2011. All development was conducted in Venelles, France.
As with any moving vehicle, unsafe operation could result in loss of control, structural damage, or loss of life. The following is a list of some of the potential hazards for helicopters:
Settling with power is when the aircraft has insufficient power to arrest its descent. This hazard can develop into Vortex ring state if not corrected early.
Vortex ring state is a hazard induced by a combination of low airspeed, high power setting, and high descent rate. Rotor-tip vortices circulate from the high pressure air below the rotor disk to low pressure air above the disk, so that the helicopter settles into its own descending airflow. Adding more power increases the rate of air circulation and aggravates the situation. It is sometimes confused with settling with power, but they are aerodynamically different.
Retreating blade stall is experienced during high speed flight and is the most common limiting factor of a helicopter’s forward speed.
Ground resonance is a self-reinforcing vibration that occurs when the lead/lag spacing of the blades of an articulated rotor system becomes irregular.
Low-G condition is an abrupt change from a positive G-force state to a negative G-force state that results in loss of lift (unloaded disc) and subsequent roll over. If aft cyclic is applied while the disc is unloaded, the main rotor could strike the tail causing catastrophic failure. Dynamic rollover in which the helicopter pivots around one of the skids and ‘pulls’ itself onto its side (almost like a fixed-wing aircraft ground loop).
Powertrain failures, especially those that occur within the shaded area of the height-velocity diagram.
Tail rotor failures which occur from either a mechanical malfunction of the tail rotor control system or a loss of tail rotor thrust authority, called "loss of tail-rotor effectiveness" (LTE).
Brownout in dusty conditions or whiteout in snowy conditions.
Low rotor RPM, or "rotor droop", is when the engine cannot drive the blades at sufficient RPM to maintain flight.
Rotor overspeed, which can over-stress the rotor hub pitch bearings (brinelling) and, if severe enough, cause blade separation from the aircraft.
Wire and tree strikes due to low altitude operations and take-offs and landings in remote locations. Controlled flight into terrain in which the aircraft is flown into the ground unintentionally due to a lack of situational awareness.
Mast bumping in some helicopters List of fatal crashes
Deadliest helicopter crashes by death toll
DateOperatorAircraftEvent and locationDeath toll
19 August 2002RussiaMil Mi-26Shot down over Chechnya127
9 December 1982NicaraguaMil Mi-8Shot down by Sandinistan rebels while carrying 88 people. All 84 passengers were killed and all four crew members survived.84
4 February 1997IsraelSikorsky CH-53 Sea Stallion (x2)Collision over Israel73
14 December 1992Russia (Russian Air Force)Mil Mi-8Shot down by Georgian forces in Abkhazia using SA-14 MANPADs, despite heavy escort. Three crew and 58 passengers, composed of mainly Russian refugees.61
4 October 1993GeorgiaMil Mi-8Shot down when transporting 60 refugees from eastern Abkhazia; all on board were killed.[failed verification]60
10 May 1977IsraelCH-53Crash near Yitav in the Jordan Valley54
8 January 1968United StatesSikorsky CH-53A Sea Stallion, USMCCrash near Đông Hà Combat Base in South Vietnam. All five crew and 41 passengers were killed.46 11 July 1972United StatesSikorsky CH-53D Sea Stallion, USMCShot down by missile near Quảng Trị in South Vietnam. Six US Marines and 50 Vietnamese Marines on board. Three US Marines and 43 Vietnamese Marines were killed.46 11 September 1982United StatesBoeing CH-47 Chinook, U.S. ArmyCrash at an air show in Mannheim, then located in West Germany.46 6 November 1986British International HelicoptersBoeing 234LR ChinookCrash in the Shetland Islands45
28 January 1992AzerbaijanMil Mi-8Shootdown44
3 July 2009Pakistan (Pakistan Army)Mil Mi-17Crash41
6 August 2011United StatesCH-47 ChinookShootdown, Afghanistan38 18 August 1971United StatesCH-47 Chinook, US ArmyCrash near Pegnitz, then located in West Germany. All four crew and 33 passengers were killed.37 26 January 2005United StatesSikorsky CH-53E Super Stallion, USMCCrash landed near Ar Rutbah, Iraq31 World records
Speed400.87 km/h (249.09 mph)Westland LynxJohn Trevor Egginton (UK)11 August 1986UK Distance without landing3,561.55 km (2,213.04 mi)Hughes YOH-6ARobert G. Ferry (USA)6 April 1966United States Around-the-world speed136.7 km/h (84.9 mph)Agusta A109S GrandScott Kasprowicz (USA)18 August 2008From and to New York City
via Europe, Russia, Alaska, CanadaNo in-flight refueling Highest altitude without payload12,442 m (40,820 ft)Aerospatiale LamaJean Boulet (France)21 June 1972France Highest level flight altitude11,010 m (36,120 ft)Sikorsky CH-54 TarheJames K. Church4 November 1971United States Altitude with 40-tonne payload2,255 m (7,398 ft)Mil V-12Vasily Kolochenko, et al.6 August 1969USSR Highest takeoff (turbine)8,848 m (29,029 ft)Eurocopter AS350Didier Delsalle14 May 2005NepalMount Everest Highest takeoff (piston)4,300.7 m (14,110 ft)Robinson R44Mark Young12 October 2009United StatesPike’s Peak, Colorado First manned electric flightPurely electric hoverSolution F PrototypePascal Chretien12 August 2011FranceVenelles Longest human-powered liftPedalling, lift 64 s endurance, 3.3 m height; diagonal width: 46.9 mAeroVelo Atlas, 4 rotorsDr. Todd Reichert13 June 2013CanadaIndoor soccer stadium; Igor I. Sikorsky Competition winner
Tagged: , niagara.gorge , usa , new.york.state , state.park , outdoor , north america , america , united states , stateside , the empire state , NYC , the big apple , new york city , city
I combined photos of a sculpture that was on display in Madison Square Park from May 5 to Aug 14, 2011 in New York City. HSS
Towering forty-feet above the central Oval Lawn, Jaume Plensa’s Echo is a monumental sculpture that depicts the head of a nine-year-old girl from the artist’s Barcelona neighborhood. The work, marking Plensa’s New York City public space debut, is made of resin, steel and coated in white marble dust. Echo, a mountain nymph in Greek mythology, was cursed by the goddess Hera. As a result, she was unable to speak, except for the last words uttered by another person.
The calm of Plensa’s Echo offers a quiet counterpoint to the voices of the thousands of daily visitors to Madison Square Park. A child with her eyes closed and her mouth poised, the looming sculpture conveys peaceful, dream-like introspection with the surreal air of disquietude. Drawing on Surrealism’s links to his work, the artist has said that “the beauty of art is that your dreams must be shared with others, but first you must dream.” Plensa is closely identified today with his practice of creating outsized portrait heads of those in his community in Barcelona. He realizes their likenesses and then, with computer technology and sophisticated fabrication techniques, transforms each individual as a collective figure of the human condition. [Madison Sq. Pk. Conservancy Website].
Tagged: , NY , New York , Madison Square Park , Echo , Sculpture , Jaume Plensa , Composite
James 5:1-6 “Now listen, you rich people, weep and wail because of the misery that is coming on you. Your wealth has rotted, and moths have eaten your clothes. Your gold and silver are corroded. Their corrosion will testify against you and eat your flesh like fire. You have hoarded wealth in the last days. Look! The wages you failed to pay the workers who mowed your fields are crying out against you. The cries of the harvesters have reached the ears of the Lord Almighty. You have lived on earth in luxury and self-indulgence. You have fattened yourselves in the day of slaughter. You have condemned and murdered the innocent one, who was not opposing you.”
Anyone who isn’t sleeping can see that there is an economic crash coming around the corner (all by design). After the dust settles from this, the U.S. will no longer be the world’s reserve currency. We will also get Universal Basic Income/Universal Basic Socialism, and we will become a cashless society. Oh, what fun, a Social Credit System, just like China! In the west, it’s already here in softer form: Banks shutting down the accounts of Christian ministries because their beliefs and opinions do not line up with the New World Order narrative. PayPal also likes to shut down people’s accounts. What about Social(ist) Media like Facistbook? Have you ever heard the terms “Cancel Culture” or “Deplatforming” or “Shadow Banning”? There are people banned off all major Social Media platforms. Google has banned some alterative news and natural health sites. This is no shock, since U.N. Agenda 21 has a thing called “Public-Private Partnerships”, in which governments and corporations and NGOs work together to implement the New World Order agenda piece by piece in ways that they couldn’t do alone, all the while giving the corporate fascists our resources/assets/infrastructure. Vaccine Passports anyone?…if you are good and take the vax every time you are supposed to, then you can freely travel about…Hello, Social Credit System! The ultimate Social Credit System will be the Mark of the Beast.
Authoritarianism, here we come! Digital slavery, oh what fun! Let’s microchip you; it’s for your own good, for your own enslavement! Bow down before the AI god, the Image of the Beast, or die! What a dream, what a utopia!
Tagged: , dollar , dies , money , ecteronic , digital , cashless , control , bw , black , white , monochrome , fuji , fujifilm , macro , close up , world system , beast system , nwo , great reset , new norm , tones , contrasts , focus , photography , fan , pc , computer , mammon , coins , coinage , small change , savings , nest egg , currency , digital currency , fiat money , paper money , play money , fake money , monopoly money , printed money , worthless , bogus , economic crash , great depression , world’s reserve currency , Universal Basic Income , globalism , agenda 21 , scheme , evil
1. Literally, carpentry. One should always double check one’s measurements before cutting materials to minimize the chances of mistakes thus wasting materials, time, and money.
2. Figuratively, when describing oneself. Plan and prepare careful and thorough manner before taking action.
This amazing sewing and craft room is sponsored by ChiMia and Lagom!
Worktable: ChiMia – Workshop desk @ $50L Friday 4/30/21
Rugs: ChiMia – Flea Market Rugs @ $50L Friday 4/30/21
Computer: ChiMia – ChiDesktop Gift for VIP Group Gift @ Mainstore (FREE to join)
ChiMia Mainstore LM: maps.secondlife.com/secondlife/Serena%20Pisces/92/128/22
FLICKR GROUP: www.flickr.com/groups/mournful-monday/
You’ll want this Crafters Desk from Lagom! It was at the March round of Uber Hometown and will be in their mainstore soon!
Workspace: Lagom – Crafters Desk
Lagom Mainstore: maps.secondlife.com/secondlife/Magical/85/87/1971Lagom Marketplace: marketplace.secondlife.com/stores/154234Lagom Flickr: www.flickr.com/photos/141118288@N08/
Dead Dollz – My Attic Gacha
*Textiles Rack / Patterns
*Spools Thread Rack
Tres Blah – Workspace Gacha
Ribbon: Ariskea – Florist Ruban gacha item
Pencils: Fancy Decor – Pencil Holder
Table: Dust Bunny – Blanket Storage Table
Link to decor lanmarks and credits:
Polytron is one of the local electronic equipment brands that continues to innovate. You can also see the superior quality and technology in the speaker products. Not surprisingly, their products are in demand in the market, such as soundbar speakers, active speakers, and home theater speakers.
This article will discuss more about the complete Polytron speakers by selecting them. Sky Tower Home Theater Speaker, Muze Mini Bluetooth Speaker, and other good Polytron speakers are also discussed here. So, don’t miss the article, OK!
How to choose Polytron speakers
There are many Polytron speaker products that you can choose from. Each product has its own advantages. To make it easy for you to find speakers that suit your needs, here are tips for choosing them.
Choose according to the Polytron speaker category
Polytron releases several speaker categories that are tailored to your needs. Each category has its own features and specialties. Well, here is the review.
Active speaker, produce a loud sound
Active speakers usually have an amplifier that will amplify the sound produced. This type of speaker is also equipped with a subwoofer that can maximize bass sound. Polytron speakers themselves are famous for their good bass sound quality such as the Polytron PAS 8C28.
In terms of size, on average, active speakers have a larger size. You can also see this on the Polytron PAS PRO 15F2 speaker. These specifications make this type of speaker very suitable for use in large rooms for the needs of events such as music concerts or parties.
Home theater speaker, bring the cinema at home
This type of speaker generally consists of several sound system components so that it looks quite complex. As the name implies, home theater speakers are made to create cinema-style sound quality that you can enjoy at home. Therefore, this type of speaker is much sought after by film lovers.
This speaker consists of more than one speaker bar which aims to produce sound effects from various directions. Thus, the resulting sound will become more alive. So, for those of you who want to present a cinema at home, you can choose speakers such as the Sky Tower Home Theater PHT 728S.
Multimedia speaker, flexible for various activities
If you are looking for speakers that are flexible in use, this is the type of speaker that is most appropriate. The sound quality of these speakers is usually suitable for indoor or outdoor activities. Not only that, these types of speakers generally have different types of inputs so they can be easily plugged into various devices.
You will also find various multimedia features, such as FM radio, MP3 player, or video player on this speaker. There are also speakers that have features that make it easier for you to karaoke, such as the Polytron Multimedia Audio PMA 9502 speaker.
Wireless speaker, easy to move and install anywhere
Wireless speakers let you listen to music without the use of wires. So, you can place and move them anywhere more easily. This type of speaker is usually equipped with Bluetooth features such as the Muze Mini Bluetooth Speaker PSP B2.
In addition, there are also wireless speakers that have Wi-Fi features. Compared to Bluetooth, the Wi-Fi feature has a wider wireless range. In addition, the signal is also stronger so that the resulting sound quality is not intermittent. The Wi-Fi feature is also available on the Polytron Muze Multiroom Speaker PMS R1.
Speaker soundbar, the design is compact and takes up no space
For those of you who have limited space, a speaker soundbar is the solution. The shape is very slim and not too big, making it take up less space. The appearance is also very simple so it won’t interfere with your minimalist room decor.
Even though the size is very slim, you don’t need to doubt the sound quality of this type of speaker. Many think, soundbar speakers have sound quality that is almost similar to home theater speakers. You can prove this assumption directly through the Polytron Soundbar PHT 225 / SB speaker.
Consider additional multimedia features to make them even more useful
When choosing speakers, also consider products that have additional multimedia features. Multimedia features will bring many benefits for your daily activities. You also won’t get bored easily because this multimedia feature is very entertaining.
To answer this need, Polytron adds many multimedia features to its products. For example, the Active Speaker PAS 8C28 has a video out feature that lets you play videos with this speaker.
There are also speakers with FM radio features such as the Muze Mini Bluetooth Speaker PSP C1 whose channels are free for you to choose. For you true music lovers, Polytron also facilitates music playback via the MP3 player feature. Not to forget, there is also a music recorder feature which is certainly useful for those of you who like to play music.
Also pay attention to the speaker connectivity
Don’t forget to consider connectivity issues too, huh. The reason is, the connectivity feature will make it easier for you to connect speakers to various other devices. So, make sure the speaker you choose can be connected to the device you want.
For those of you who want to play music or videos from a flash drive or memory card, you can choose Polytron speakers with a USB input or micro SD slot. You can find this kind of connectivity on the Polytron PAS 8C28 and PAS PRO 15F2 speakers.
Meanwhile, Polytron speakers such as the Big Band Theater BB 5510 are equipped with aux input and microphone input connectivity . Thanks to this connectivity, you can connect the speaker to a musical instrument or microphone. You can also choose Polytron speakers such as the Muze Mini Bluetooth Speaker PSP C1 which can be connected to a smartphone.
Prioritize those that can be controlled remotely
For those of you who don’t want to be bothered, choose speakers that have a remote control such as the Polytron Multimedia Audio PMA 9502. This remote control can help you control your speakers remotely. So, the use of speakers will be more practical and not waste energy.
Amazingly, now Polytron also has speaker control technology via smartphone like the one in the 5.1 Speaker System PHT 551. With this technology, you can control speakers with various types of smartphones that have the Polytron Audio Connect application.
10 Best Polytron Speaker Recommendations
The following are recommendations for the ten best Polytron speaker products that we have compiled based on price, type and specifications. Don’t forget to apply the points above when choosing, OK!
Polytron | Muze Mini Bluetooth Speaker PSP C1
A multi – function speaker that can be used for making calls
It is easy to connect this speaker to your smartphone thanks to its high-speed Bluetooth feature. In addition, the Bluetooth range is also quite wide, up to 10 meters. Its slim and lightweight shape also makes it easy for you to carry it anywhere.
Interestingly, this speaker also has a small, supersensitive microphone. So, those of you who want to make direct telephone calls through the speaker can choose it. You can also listen to music from various sources thanks to the support of the USB slot, micro SD, and aux input on this speaker.
Polytron | Muze Multiroom Speaker PMS R1
Channel sound throughout the room with its Multiroom mode
Not only Bluetooth, this speaker is also equipped with Wi-Fi features. This makes this speaker very easy to connect to similar speakers or other devices. Those of you who want to play music in multiple rooms at once will be pleased with this speaker.
You music lovers, of course, will also be spoiled by the S putrefy connect feature on this speaker. You can also select and play your favorite song from your Spotify list. In addition, through the UNDOK application, you can operate this speaker via a smartphone.
Polytron | Muze Mini Bluetooth Speaker PSP B2
Waterproof, safe for outdoor activities
Those of you who like to do outdoor activities must have this speaker. This mini-size Bluetooth speaker is very practical to carry and store in a bag. Moreover, this speaker is also waterproof so it is safe to carry for outdoor activities such as sports, hiking or picnics.
In addition, this speaker will not get dirty easily because it is designed with dust-proof material. Amazingly, when the battery is full, these speakers can play music for up to six hours! The battery power is also more efficient because the speaker will automatically turn off if no device is connected.
Polytron | Active Speaker PAS 8C28
With XBR Woofer technology, the bass sound is very jarring
Want to feel a powerful bass sensation? Active speaker PAS 8C28 is the answer! Designed with XBR Woofer technology with a 3 ways speaker system model, the bass quality of these speakers is excellent, clear, and detailed.
Not only that, this speaker is also supported with super bass technology, which keeps the bass steady even at a small volume. In addition, this speaker has a touch of prism cut and ambience light which makes it look very cool.
Polytron | 5.1 Speaker System PHT 551
The surround effect is more pronounced thanks to 5 satellites
Speakers with 5.1 model consists of one main speaker and five satellite speakers. Thanks to the many satellite speakers, the automatic sound range is also wider. Well, for those of you who like sound effects from all over or surround, this speaker can be the right choice.
Equipped with the Polytron Audio Connect feature, you can control these speakers via a smartphone. This smart speaker is also equipped with various inputs that make it easy to connect to a computer, TV or DVD player.
Polytron | PHT 225 / SB Soundbar
Simple speaker with clear sound quality
You certainly wouldn’t expect this minimalist speaker to have such great sound quality. This is because these speakers have been supported by a high quality subwoofer. The 2.1 channel model allows the sound produced by these speakers to span the entire room.
The ultra-slim design makes this speaker easy to place on a table or on a wall. For those of you who want to get a sound quality class like a home theater speaker in a limited space, this Polytron soundbar is the solution.
Polytron | Polytron Multimedia Audio PMA 9502
Karaoke is even more fun with this speaker
Are you a karaoke fan? If so, this multimedia speaker from Polytron is the best choice. Has two microphone inputs, you can sing using the microphone. You can also adjust the echo sound on the microphone according to your taste.
This speaker is equipped with bass and treble control that will make your voice pleasant to hear when singing. With these speakers, it will feel like you are recording in a studio! In addition, this speaker is also equipped with a USB input so you can sing along to the music that you store on the flash.
Polytron | PAS PRO 15F2
A speaker with a wide sound range
For those of you who are looking for speakers with loud voices, choose these speakers. The PAS PRO 15F2 is equipped with a 15-inch woofer that will produce a very loud sound. For events like weddings or music concerts, these speakers are perfect.
This speaker also has a trolley that makes it easy to move around. In addition, this speaker is also equipped with a stand that can be adjusted in height so that the range is wider. Amazingly, this speaker is equipped with two power modes, namely battery and cable.
Polytron | Big Band Theater BB 5510
Can be connected to various musical instruments, perfect for those of you who like music
This speaker is specially created for those of you who like to play musical instruments. How not, this speaker has a music instrument board interface that can be connected to a musical instrument such as a piano, electric guitar, or an electric drum.
No half-hearted, this speaker is also equipped with distortion and compressor effects that can reduce noise when you play a musical instrument. As a result, the sound produced is also clear. Apart from that, you can also record the sound of your music playing thanks to the single deck stereo cassette recorder feature on this speaker.
Polytron | Sky Tower Home Theater PHT 728S
Watching a cinema-style movie at home? Sure, you can with this speaker!
Now you can make your own cinema at home with this speaker. This home theater speaker has four standfloor type speakers and one center speaker. Thanks to this composition, the speakers are able to provide clear sound quality like in a cinema.
This speaker is also equipped with XBR Subwoofer technology so that the bass quality is so superior. In addition, the PHT 782S speaker also supports video playback with high resolution up to 720p. What’s more, its simple and elegant design will perfectly match various room designs.
Finally, the discussion about Polytron speakers this time has been completed. All of the Polytron speakers we recommend are very attractive, right? We hope that this method of choosing will make it easier for you.
In addition, when buying speakers, pay attention to the power. We recommend that you adjust it to the maximum power capacity in the house so that there is no power drop when the speakers are used. In addition, so as not to take up space, also adjust the speaker size according to your room.
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USB CHARGE PORT WITH INBUILT CABLE – External USB port with built-in charging cable offers a convenient charging of your electronic device anywhere. This bag does not include a battery and you need a power bank to charge your mobile phone, tablet or speaker. There is a retro reflective tape on the front of the bag, which makes this backpack more conspicuous in the night. This is a safe backpack while walking, travelling or biking during the night.WATER REPELLENT OXFORD FABRIC – We use high quality 300D waterproof, cut-proof and dust-proof polyester and PVC fabric with nylon sponge, which protects your belongings during rain season. It has metal zippers, breathable mesh shoulder straps and 6-layers of breathable mesh back padding. It is durable, lightweight and comfortable.MULTI COMPARTMENT DAYPACK – 90° or 180° adjustable main compartment is equipped with large space for 15.6 Inch laptop and medium space for tablet computer or iPad. In addition there are multiple compartments that are suitable for keeping pens, mobile phone, calculator, mp3 player, wallet, passport, iPod, power bank, notebooks, keys, watch, headphones, clothes, umbrella, water bottle and many other items. 180° opening like a suitcase helps in organising stuff easily.ERGONOMIC DESIGN, PADDED STRAPS & CUSHIONING – Shoulder straps have an ergonomic design.
Western Veil Nebula (Caldwell 34), 06/25/2020
This object is part of a super nova remnant from a star that was 20 times more massive than the sun. When that star blew up some 10,000 to 20,000 years ago, it left behind ionized gas and dust that has expanded to cover an area of the sky roughly 6 times the diameter of the Moon. This picture is only one small part of that explosion.
This night was kind of a last-minute decision. I looked outside and saw clear skies so I quickly setup the gear. It was my first night using some new toys, a new light pollution filter and an Asiair Pro computer. The new equipment worked great but I did have a few issues. I had my gain set to 200 for some reason and the polar alignment was crap. But I think I salvaged the data and the image turned out pretty good.
ZWO Asiair Pro
Optolong L-eHhance filter
Location – My back yard in Tacoma WA
Bortle Class 8
120 60-second Lights
Astro Pixel Processor
#astrophotography #astronomy #comos #nightphotography #space #telescope #deepsky #asi294mcpro #amateurastronomy #backyardastronomy #asiair #rasa #celestron #astropixelprocessor #optolong #telescope #astronomyphotography #deepskyobject #zwo #longexposurephotography #caldwell34 #veilnebula