Wing sail and method of use

Details Wing sail and method of use Wing sail and method of use

1997-06-24

1999-02-09

Swinehart, Ed L.

Ships

Sail or control means therefor

Specific sail structure or arrangement

114 39001, B63H 908

Patent

active

058680926

ABSTRACT:
A sail (20) for a sailing vessel (500) includes a leading spar (22), a coplanar trailing spar (24), and a movable spar (28) disposed between the two. A sheath (30) of sail cloth traversely surrounds the three spars forming a flexible double-sided wing-like structure. When the wind (600) blows against sail (20), movable spar (28) is urged toward the leeward side of sail (20), and transforms that side into the curved or long side of an airfoil, thereby creating a push force (54) which propels the sailing vessel (500).

REFERENCES:
patent: 4341176 (1982-07-01), Orrison
patent: 4945847 (1990-08-01), Walker
patent: 5320310 (1994-06-01), Mitchell
"Curious Yachting Inventions" by Joachim Schult (ISBN 0-808-2104-1) Various Figs. of this book as indicated on the attached sheet.

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