Tack aback sailboat

Details Tack aback sailboat Tack aback sailboat

1995-10-10

1997-02-18

Swinehart, Edwin L.

Ships

Displacement-type hull

Multiple hulls

114 91, B63B 1500

Patent

active

056032773

ABSTRACT:
A rudderless sailboat having a hydrodynamic symmetry fore and aft which can be sailed equally well in either direction. The craft is steered by tilting the mast and keel. In an alternative embodiment the sailboat also has no keel. The hulls are rigid and have a v-shaped bottom. While sailing forward, the sail can be rotated past the angle of zero angle-of-attack to that angle-of-attack where the wind is aback on the sail. This stops the boat and causes it to sail back in the general direction from which it came. This sailboat maneuver is called a tack aback.

REFERENCES:
patent: 3859943 (1975-01-01), Katainen
patent: 3885512 (1975-05-01), Marcil
patent: 3972300 (1976-08-01), Adamski
patent: 3986473 (1976-10-01), Truzzi
patent: 4067280 (1978-01-01), Serfess
patent: 4102287 (1978-07-01), Ferris
patent: 4385579 (1983-05-01), Baulard-Caugan
patent: 4766830 (1988-08-01), Kunz
patent: 4819574 (1989-04-01), Westerman
patent: 5072682 (1991-12-01), Urroz et al.
patent: 5113775 (1992-05-01), Imhoff
patent: 5410977 (1995-05-01), Webb
High Speed Sailing, p. 93.
Dictionary Excerpt for Proa.

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