Rotary blades

Details Rotary blades Rotary blades

1994-03-08

1996-02-20

Lopez, F. Daniel

Fluid reaction surfaces (i.e., impellers)

Removable auxiliary attachment to work surface

416228, 416236R, 416243, B64C 27467

Patent

active

054924480

ABSTRACT:
A rotary blade includes a fixed boundary layer control device extending spanwise on a lower surface adjacent the trailing edge to improve the lift/thrust characteristics of the blade especially at positive incidence angles. It was discovered that expected detrimental effects at zero
egative incidence did not materialize and the reasons are identified. Such blades are particularly useful for helicopter sustaining and anti-torque rotors.

REFERENCES:
patent: 1893064 (1933-01-01), Zaparka
patent: 2385070 (1945-09-01), Gant
patent: 2396811 (1946-03-01), Bathras
patent: 3697193 (1972-10-01), Phillips
patent: 3776363 (1973-12-01), Kuethe
patent: 4542868 (1985-09-01), Boyd
patent: 4552511 (1985-11-01), Sumigawa
patent: 4618313 (1986-10-01), Mosiewicz
patent: 4858852 (1989-08-01), Henne et al.
patent: 5088665 (1992-02-01), Vijgen et al.

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