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In the past few ten years so m any kinds of "vertical takeoffand land (VTOL) " aircraft came out.With new configuration, they have the advantages of both helicopters and airplanes.The flight envelope can be extended.The flight performance can be improved.Among of them.Tilt-rotor aircraft V-22 from Bell and the X-50 come from Boeing Company are more famous.As unmanned aircraft, there are many critical technical problems to be solved.