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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.
Twin rotor: Experimental: August 1955: Prototype: 2: Originally designated XH-33. [7] Bell XV-15: US: Twin rotor: Experimental: May 1977: Prototype: 2: Developed into V-22 Osprey. [8] Bell X-22: US: Quad fans: Experimental: May 1977: Prototype: 2: 4 tilting ducted fans powered by 4 turboshaft engines Bell Boeing V-22 Osprey: US: Twin rotor ...
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.
Around 2005 [13] –2010, [14] Bell and Boeing teamed up again to perform a conceptual study of a larger Quad TiltRotor (QTR) for the US Army's Joint Heavy Lift (JHL) program. The QTR is a larger, four rotor version of the V-22 with two tandem wings sets of fixed wings and four tilting rotors.
Rotorcraft generally include aircraft where one or more rotors provide lift throughout the entire flight, such as helicopters, autogyros, and gyrodynes. Compound rotorcraft augment the rotor with additional thrust engines, propellers, or static lifting surfaces. Some types, such as helicopters, are capable of vertical takeoff and landing.
Bell and Boeing have studied larger Quad Tiltrotor (QTR) military models for possible application to the US Army's Joint Heavy Lift (JHL) program. A Quad Tiltrotor is a larger four rotor version of a Tiltrotor aircraft. It has 2 sets of fixed wings and 4 tilting rotors mounted at the tips of the wings.
The normal path for power was directly from the engine into a speed-reduction gearbox and into the rotor/propeller without any long shafts involved. There was still a driveshaft along the wings for emergency use to transfer power to the opposite rotor in case of engine failure, but that shaft did not normally carry any power loads, allowing it ...
Engines with a future planned block 4 upgrade would be expected to deliver nearly 10,000 horsepower (7,500 kilowatts). [ 19 ] An ongoing problem with the engines was their propensity for surging or stalling with 68 incidents reported between 2003 and October 2016 though this rate had reduced after the introduction of the Block 3 engine version.
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