1978-10-02
1980-07-01
Frankfort, Charles E.
9309, A63B 3110
Patent
active
042098661
ABSTRACT:
A swim fin which achieves increased efficiency by increasing drive (forward propulsive thrust) and decreasing effort (resistance to vertical motion) to provide a greater drive-to-effort ratio. The blade of the fin which is pivotally mounted to the foot section along a pivot line aft of the leading edge of the blade, has a reversible effective streamlining camber. These features in combination with a large open flow passage defined between the toe portion and blade make possible the attainment of efficient propulsion through vertical motion of the legs of the wearer of the swim fins.
REFERENCES:
patent: 2343468 (1944-03-01), Messinger
patent: 3055025 (1962-09-01), Ferrard et al.
patent: 3082442 (1963-03-01), Cousteau et al.
patent: 3183529 (1965-05-01), Beuchat
patent: 3422470 (1969-01-01), Mares
patent: 3665535 (1972-05-01), Picken
patent: 3908213 (1975-09-01), Hill
patent: 4083071 (1978-04-01), Forjot
Arthur D. Little Inc.
Frankfort Charles E.
Lepper Bessie A.
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