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Stopped-rotor combat aircraft
Stopped-rotor combat aircraft are convertible fixed-wing / helicopter aircraft, proposed in the United States in the late 1990s.
==Design==
The X-Wing WarFighter is a conceptual aircraft using a stopped rotor X-Wing platform in a unique class of hybrid helicopter / fixed-wing aircraft. For vertical take-off and landing (VTOL) they operate with a helicopter like rotary-wing platform, exhibiting similar low hover disc loading ideal for lifting heavy loads efficiently, including in high-hot altitude conditions. For high speed forward flight the rotary-wing blades are stopped, and begin serving as fixed-wing aerofoils. Since there no longer are high-speed high-drag advancing rotary-wing blades as with conventional helicopters, the aircraft can potentially fly efficiently at higher speeds, similar to conventional fixed-wing aircraft.
Claimed but not experimentally verified improvements over other stopped rotor designs include: (1) Ability to “snap” between rotary-wing and fixed-wing flight modes, in both directions, in about 1/3 of a second by coupling the rotary-wing platform to a spinning flywheel (via rotational momentum transfer between flywheel and rotary-wing platform), virtually eliminating typical several second unsteady/unstable conversion time between flight modes of other designs, (2) flipping the airfoil 180° during conversion, such that conventional aerodynamically efficient airfoils (e.g. exhibiting blunt leading edge and sharp trailing edge) are utilized as opposed to using less efficient elliptical or other symmetrical like airfoils that have to fly in both directions, and (3) use of a convertible engine (a convertible engine is essentially a turboshaft engine driving a variable pitch ducted fan) by applying efficient direct drive shaft horsepower to the rotary-wing platform during VTOL mode while the ducted fan produces almost no forward thrust, and applying efficient horizontal thrust in fixed-wing flight mode where the ducted fan produces 100% of the thrust.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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