Aerofoil sail

Details Aerofoil sail Aerofoil sail

1981-11-13

1983-09-06

Blix, Trygve M.

Ships

Sail or control means therefor

Specific sail structure or arrangement

244214, B63H 904

Patent

active

044022778

ABSTRACT:
An aerofoil sail has a rigid main panel (10) pivotally mounted to a hull (17) about a vertical axis (15) with trailing a flap (12A) hinged (14) to one side of the main panel. The trailing flap comprises a series of separate flaps (12A' ,12A" ,12A'") individually settable so that the angle of incidence can differ (.alpha.,.beta.) at different levels on the sail. Alternatively, a single trailing flap can be torsionally flexible so that the angle of incidence can differ along its length. In a preferred form flaps (12A,12B) are provided at opposite edges of main panel (10) and can be alternatively folded in to give a reversible aerofoil section.

REFERENCES:
patent: 3524610 (1970-08-01), Alvarez-Calderon
patent: 3904152 (1975-09-01), Hill
patent: 3934533 (1976-01-01), Wainwright
patent: 3977348 (1976-08-01), Bordat et al.
patent: 4096817 (1978-06-01), Bordat
patent: 4146200 (1979-03-01), Borzachillo
patent: 4189120 (1980-02-01), Wane
patent: 4335671 (1982-06-01), Warner et al.
Basic Principles of Aero-Hydrodynamics, p. 308.
Scherer, J. O., "Aerodynamics of High-Performance Wingsails", Marine Technology, Jul. 1974.

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