FanWing or fan wing is a new concept for a type of STOL aircraft. It is distinct from existing types of aircraft like airplanes and helicopters in using afixed wing with a forced airflow produced by cylindrical fan(s) mounted at the leading edge of the wing.
Its makers claim it is the first horizontal-rotored integral lift and propulsion wing in history to sustain flight.
FanWing Ltd is the name of the company created to develop the concept.
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Concept: The FanWing is a distributed-propulsion aircraft with a trapped vortex inside the rotor cage. A cross-flow fan at the leading edge of the wing transfers the work of the engine to the air along the entire wingspan. The resulting acceleration of the large volume of air offers very short-take off, no stall and efficient short-haul heavy lift capability.
Efficiency: Documented efficiencies for the first prototypes were 20 grams of lift per Watt of shaft power, indicating an initial lift of 1 –1 ½ tons in the air with 100 hp. 2002 wind-tunnel
optimisation tests indicated 29 g/W. Most recent predictions (July 2011) are that the FanWing will cover more than twice the distance of a helicopter on the same fuel load.
Speed: Higher speed wingshape modifications and wind-tunnel tests this year have resulted in new speed estimates for a 15-ton aircraft of 100kt at sea level. and 150kt at 5500 m.*
OHS Development (Outboard Horizontal Stabilizer) The recently developed TwinTail configuration, avoids the strong downwash flow directly behind the wing and exploits the upwash from the wingtip vortices. The new design has increased the efficiency of the aircraft by between 10 and 15% and also improved pitch stability.
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