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The Bell Boeing Quad TiltRotor (QTR) is a proposed four-rotor derivative of the Bell Boeing V-22 Osprey developed jointly by Bell Helicopter and Boeing.The concept is a contender in the U.S. Army's Joint Heavy Lift program (a part of Future Vertical Lift program).
This model incorporates many revisions to the basic Challenger design, including a larger and re-shaped vertical fin, fiberglass wing tips and redesigned landing gear. Qualifies as a US Light sport aircraft, 110 reported completed and flown by the fall of 2011. [1] [8] [11] Challenger II LSS XL-65 Two seats in tandem, 29 ft (8.8 m).
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.
Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the torque. [1] An alternative is to mount two rotors in a coaxial configuration.
A powered lift aircraft takes off and lands vertically under engine power but uses a fixed wing for horizontal flight. Like helicopters , these aircraft do not need a long runway to take off and land, but they have a speed and performance similar to standard fixed-wing aircraft in combat or other situations.
The best stair lifts provide a safe way to move between the floors of your house, and there are options available for every budget. ... $2,195+ at AmeriGlide $2,149 at Amazon. Best curved Bruno ...
Aeronca 7AC Champion on skis Champion 7FC Tri-Traveller at the Canadian Museum of Flight. The Aeronca Model 7 Champion, commonly known as the "Champ", or "Airknocker", [3] [5] [7] [8] is a single-engine light airplane with a high wing, generally configured with fixed conventional landing gear and tandem seating for two occupants.
The Boeing Vertol CH-46 Sea Knight is a medium-lift tandem-rotor transport helicopter, furnished with a set of counter-rotating main rotors in a tandem-rotor configuration. It was typically powered by a pair of General Electric T58 turboshaft engines, which were mounted on each side of the rear rotor pedestal; power to the forward rotor was ...