New Design Concept of Compound Helicopter

摘要

The market trends in the design of helicopter have shown that in order to be competitive it is necessary to investigate new design approach which may give an expanding the flight envelope of rotorcraft, but must be shown to be cost-effective. The helicopter has carved a niche for itself as an efficient vertical takeoff and landing aircraft, but have limitation on its cruising speed due to restrictions of retreating blade stall and advancing blade compressibility on the rotor in edgewise flight. This is a challenging task, which might be solved by the use of new design approach. It is believed that the application of a compound helicopter design concept would assist in achieving such a task. This work presents the feasibility study of a compound helicopter design concept, allowing for the use of a combined conventional fix-wing aircraft with single propeller in the nose and conventional helicopter to satisfy the above objectives. Description is then given of the concept proposed compound helicopter which incorporated combines main rotor-wing-auxiliary propeller. It concludes with a discussion of the results and recommendations for future work.