Helicopter blade airfoil

Details Helicopter blade airfoil Helicopter blade airfoil

1986-09-03

1988-05-17

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416242, B64C 2746

Patent

active

047447281

ABSTRACT:
A family of airfoil cross sections, termed SC21xx, for use in a helicopter blade is disclosed. The airfoil (36) achieves maximum lift performance equivalent to prior art airfoil configurations without incurring increased aerodynamic drag at high velocities. The airfoil (36) was developed by thickening and drooping the leading edge region (38) of the prior art airfoil (30) improving lift in the leading edge region (38) and delaying the formation of sonic shock waves at high velocities.

REFERENCES:
patent: 3728045 (1973-04-01), Balch
patent: 4142837 (1979-03-01), de Simone
patent: 4248572 (1981-02-01), Fradenburgh
patent: 4314795 (1982-02-01), Dadone
patent: 4459083 (1984-07-01), Bingham
patent: 4564337 (1986-01-01), Zimmer et al.
patent: 4569633 (1986-02-01), Flemming
patent: 4652213 (1987-03-01), Thibert

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