Sailboard with reciprocating fins and umbrella type rotary paraf

Details Sailboard with reciprocating fins and umbrella type rotary paraf Sailboard with reciprocating fins and umbrella type rotary paraf

1993-04-19

1995-04-25

Avila, Stephen P.

Marine propulsion

Oscillating propelling means

Fishtail motion propelling means

440 31, 114 391, B63H 136

Patent

active

054094089

ABSTRACT:
The windsurf board comprise a revolving sail, reciprocating fins and single sided pedal. The revolving sail rotates a drum to drive the reciprocating fin. On the drum, there are multiple cycles of slot knotched on the drum. One revolution of revolving sail will induce multiple flip-flop reciprocating motion of the reciprocating fin. The single sided-pedal uses the reciprocating motion to drive the reciprocating fins to propagate forward.

REFERENCES:
patent: 227491 (1880-05-01), Coulter
patent: 943074 (1909-12-01), Hildebrandt
patent: 2873713 (1959-02-01), Baastrup
patent: 4568290 (1986-02-01), Brown et al.
Popular Science, Jun. 1955, p. 151.

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