Abstract
The lift fan concept encompasses basically a V/STOL propulsion system consisting of a high bypass ratio jet engine. Jet engine thrust is installed in the aircraft for conventional flight, and this thrust is utilized as an energy source. Lift fans are sized for VTOL. Studies indicate that low aspect ratio wings suitable for fan installations compare very well with variablegeometry winged aircraft from a mission standpoint. In addition, vertifan aircraft can achieve V/STOL at nearly the cost of STOL only. Vertifan aircraft powered by lift fan propulsion systems are equally applicable to high subsonic or supersonic applications.
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