| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein a main rotor blade of the conventional helicopter is a lengthy rectangular shape, there is a phenomenon in which it lapses into an impact stall when the synthesis speed of the flying speed and the peripheral speed of a distal end of the main rotor blade reaches transonic speed, the distal end of the main rotor blade is made into a retreating wing as a countermeasure for avoiding a case where it lapse into an impact stall, which is modeled after the retreating wing or the delta wing of a supersonic jet aircraft, as the embodiment, and although a retreating angle is given to the distal end of the main rotor blade to form it into the C shape partial retreating wing or paddle shape, since it is twisted by huge centrifugal force, limitation is present in the size of the retreating wing part and response to sufficient high speed flying is not achieved. SOLUTION: An apex angle of a front edge of the main rotor blade is made to a saw tooth form of 90-30°according to the retreating angle of the supersonic jet delta wing aircraft and the advancement wing aircraft, and it is made in the form that a rotation speed of the main rotor blade is enhanced. Further, lack of lift generated accompanying with the apex angle of the front edge of 90-30°is compensated by increasing a blade area by lengthening bowstring length of the lengthy rectangular part of the rear edge. COPYRIGHT: (C)2009,JPO&INPIT
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