Less noisy helicopter

Details Less noisy helicopter Less noisy helicopter

B - Operations, Transporting

64

C

B64C 27/12 (2006.01) B64C 27/00 (2006.01) B64C 27/46 (2006.01)

Patent

CA 2105924

ABSTRACT A less noisy helicopter capable of reducing the level of external noises without any stall or increase in the airframe weight by selecting a lower speed of revolutions for its rotor. The helicopter comprises: a turbo-shaft type gas turbine engine having the FADEC and capable of changing its number of revolutions at least two stages during flight; and a rotor made of a composite material. The maximum lift coefficient of said rotor may be no less than a value varying linearly at a ratio of 1.54 to 1.07 to a drag diverging Mach number of 0.8 to 0.9. Selected Figure: Fig. 1

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