Aircraft having helicopter rotor and front mounted propeller

Details Aircraft having helicopter rotor and front mounted propeller Aircraft having helicopter rotor and front mounted propeller

B - Operations, Transporting

64

C

B64C 27/22 (2006.01) B64C 27/08 (2006.01)

Patent

CA 2627618

An aircraft features a nose mounted propeller on a fuselage having a typical helicopter rotor assembly. By reducing the amount of forward thrust needed from the main rotor, the propeller allows greater forward speeds as the angle of attack on the rotor's blades can be kept low to avoid the stalling and violent vibration experienced by conventional helicopters at relatively high speeds. By reducing the maximum angle of attack experienced by the main rotor during its rotation during forward cruising from that of a conventional helicopter but still using the main rotor to generate lift, the addition of wings extending from both sides of the fuselage can be avoided. The aircraft may be flown in a forward direction in a generally horizontal orientation, as the nose does not have to be pitched downward to create thrust from the main rotor.

L'invention concerne un aéronef doté d'un ensemble rotor d'hélicoptère classique, mais qui est équipé en outre d'une hélice montée dans le nez du fuselage. Cette hélice, qui réduit l'importance de la poussée avant demandée au rotor principal, permet d'atteindre des vitesses en marche avant plus élevées du fait que l'angle d'attaque des pales de rotor est réduit, ce qui évite le calage et les vibrations violentes se produisant à des vitesses relativement élevées sur des hélicoptères classiques. Le fait de réduire l'angle d'attaque maximum du rotor principal en rotation pendant le vol en marche avant par rapport à un hélicoptère classique tout en utilisant ce rotor pour la portance, évite de devoir monter des ailes de part et d'autre du fuselage. L'aéronef peut se déplacer dans le sens avant selon une direction généralement horizontale dans la mesure car il n'est pas nécessaire de piquer du nez pour obtenir la poussée du rotor principal.

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