Marine propulsion – Jet drive
Patent
1991-12-18
1993-12-07
Mitchell, David M.
Marine propulsion
Jet drive
440 41, 440 47, B63H 1102
Patent
active
052678830
ABSTRACT:
This is a water-jet propulsion system employing a cyclic air-pump to induce a cyclic reduced-pressure inside a vacuum-chamber which has front and rear valves, the front facing the predominant direction of travel. The front valve opens near the start of a "pump down" portion of the cycle to allow a jet of water to be admitted at the bottom of said boat from the "rest system" outside, into the less-than-atmospheric-pressure interior, the front or intake valve closing after the "jet-slug" is fully formed. The internal pressure changes so that when said jet-slug reaches said exit port, said chamber pressure is atmospheric and the opened exit port valve allows the water-slug to exit the chamber just prior to the beginning of a new cycle. Friction and pumping losses are minimal as the water jet is not in contact with walls over most of its trajectory, and said pump is pumping air. Low final water-velocity with respect to the rest system, high volume flow, leads to high propulsion efficiency.
REFERENCES:
patent: 1281643 (1918-10-01), Olsen
patent: 3183878 (1965-05-01), Aschauer
patent: 3479674 (1969-11-01), Beymer
patent: 3556039 (1971-01-01), Sfredda
patent: 4461620 (1984-07-01), Brachet
patent: 4541357 (1985-09-01), Stanton
patent: 4565530 (1986-01-01), Espenhain
Avila Stephen P.
Mitchell David M.
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