Air propeller

Details Air propeller Air propeller

1988-06-24

1990-05-22

Price, Carl D.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416DIG2, B64C 1118

Patent

active

049273302

ABSTRACT:
A propeller is used to displace a vehicle at a reduced speed but with a high slip of approximately at least 60% and has a quality coefficient of at least 70% for 100% slip. The ratio of the diameter of the propeller to its pitch is approximately 1.18 to 2.9 times the value of the quality coefficient, and the blade width of the propeller is 0.09 to 0.19 times the pitch of the propeller. The propeller pitch is substantially constant and the aerodynamic center of pressure is located at a distance from the propeller axis of rotation equl to approximately 3/4 of the propeller radius. The radius of the curvature of the leading propeller edge, when seen in cross section, is to approximately 1/4 to 1/3 of the greatest blade thickness. In addition the angle of the blade inclination decreases continuously as the propeller diameter increases and the blade thickness is greatest in the leading third of the blade width, relative to the normal rotation direction of the propeller.

REFERENCES:
patent: 3635590 (1972-01-01), Phillips
patent: 3697193 (1972-10-01), Phillips
patent: 4046489 (1977-09-01), Fairchild
patent: 4135858 (1979-01-01), Entat
patent: 4347038 (1982-08-01), Hayashi et al.
patent: 4392781 (1983-07-01), Mouille et al.
patent: 4431376 (1984-02-01), Luberstein et al.
patent: 4452411 (1984-06-01), Eickmann
patent: 4564337 (1986-01-01), Zimmer et al.
patent: 4744728 (1988-05-01), Lednicer et al.
Airplane Propeller Principles Nelson 9/1944.

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