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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).
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.
The Fitchburg engine (illus.) [ii] was one of a series of similar engines offered in various configurations.The steeple arrangement required a high ceiling to the engine house, but had two advantages: [6] it took up less floor space than a horizontal engine and it also required less complex masonry foundations beneath the engine.
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.
the rear of the F135 engine (nozzle rotated down) that powers the Rolls-Royce LiftSystem. Instead of using separate lift engines, like the Yakovlev Yak-38, or rotating nozzles for engine bypass air, like the Harrier, the "LiftSystem" has a shaft-driven LiftFan, designed by Lockheed Martin and developed by Rolls-Royce, [3] and a thrust vectoring nozzle for the engine exhaust that provides lift ...
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 ...