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A quadcopter, also called quadrocopter, or quadrotor [1] is a type of helicopter or multicopter that has four rotors. [ 2 ] Although quadrotor helicopters and convertiplanes have long been flown experimentally, the configuration remained a curiosity until the arrival of the modern unmanned aerial vehicle or drone.
The conceptual design featured a large tandem wing aircraft with V-22 type engines and 50-foot (15 m) rotors at each of the four wing tips. The C-130-size fuselage would have a 747-inch (19.0 m) cargo bay with a rear loading ramp that could carry 110 paratroopers or 150 standard-seating passengers.
Bangladesh People's Republic of China: 174 Type 59 tanks were upgraded to Type 59G(BD) Durjoy with kits from China in 2014–2019. [23] [24] Type 69-IIG: Main battle tank: 58 People's Republic of China: 58 Type 69-IIA tanks upgraded to Type 69-IIG version with kits from China in 2010–2013. [23] [24] Light tanks (44) VT-5: Light tank: 44
The engine is limited to 95 horsepower due to torque limits on the main gearbox and rotor system. As of June 2010, five runs of about 30 kits each had been delivered to builders, for a total of 160 kits, of which more than 80 had been completed and were flying, with another kit being completed every other month, on average (delivery of a sixth ...
The H502S, also marketed as the "H502S X4 DESIRE FPV" is a smaller version of the H501S quadcopter and same size as the H502E. Uses brushed motors, has 12 minutes' flight time, 7.4 V (2S) 610 mAh Li-Po battery, GPS Positioning, first-person view (FPV), altitude hold, follow-me mode, 720P High Definition Camera and return to home.
In 2015 the Pakistan Army ordered 12 Bell AH-Z Viper attack helicopters, with an option of 3 more to replace its aging AH-1F Cobras. Following cancellation of $300 million military aid to Pakistan by the US government, the helicopters were put into storage at Davis-Monthan AFB , Arizona .
A low-wing monoplane design primarily constructed of aluminum alloys, the JL-8 / K-8 airframe structure is designed for an 8,000 flight hour service life.. The landing gear is of tricycle configuration, with hydraulically operated wheel brakes and nose-wheel steering.
The average engine stays on wing 13,500 flight hours before a shop visit (a Shop Visit Rate of 0.073 per thousand hours). It is claimed to be cumulatively 3.4 dB quieter than other engines in its class. [1] Like other modern aircraft power plants, it has a Full Authority Digital Engine Control (FADEC), for better fuel economy and reliability. [4]