Airfoil section for a rotor blade of a rotorcraft

Details Airfoil section for a rotor blade of a rotorcraft Airfoil section for a rotor blade of a rotorcraft

B - Operations, Transporting

64

C

244/120

B64C 3/14 (2006.01) B64C 27/46 (2006.01) B64C 27/467 (2006.01)

Patent

CA 1220463

-43- Airfoil Section For A Rotor Blade Of A Rotorcraft Abstract An airfoil shaped cross section 36 for the rotor blade 14 is disclosed, Various construction details which improve the aerodynamic and drag performance of the airfoil section are developed. The upper surface 38 and the lower surface 42 are contoured by a thickness distribution and a camber distribution such that the bend of the surfaces is constant or changes at a constant rate over certain regions of the airfoil to avoid the formation of strong, normal shock waves at local Mach numbers less than 1.2 during normal, level flight conditions at standard temperature and pressure.

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