Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1996-03-01
1997-10-21
Swinehart, Edward L.
Marine propulsion
Screw propeller
Having means to control flow around propeller
415143, 415221, 440 38, B63H 118
Patent
active
056790376
ABSTRACT:
A stationary screw induction system for improving performance of a watercraft has a cylindrical housing with a first closed end and a second open end. A housing inlet opening is disposed within the housing between the first and second ends. Disposed within the inside of the cylindrical housing is an induction screw which is a helical shaped surface radially disposed about a spine which is coincident with the central axis of the cylindrical housing and forms the central section of the induction screw. The helical shaped surface has a leading edge in contact with the spine and an outside edge in contact with the inner surface of the housing. An induction channel acts to conduct fluid from the surrounding environment into the stationary screw induction system. The induction channel has an induction inlet which acts in fluid communication with the housing inlet opening. An induction inlet shelf is disposed between an edge of the housing inlet opening and the central section of the helical shaped surface at the spine. The induction channel has a first side tangential to the housing and a second side which intersects the induction inlet shelf at the housing inlet opening. The induction channel further has sides disposed between the first and second sides such that the induction channel intersects the housing at an acute angle. The stationary screw system may be further provided with an internal impeller or propeller to provide a motive source.
REFERENCES:
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patent: 3934538 (1976-01-01), Canazzi
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patent: 4929200 (1990-05-01), Guezou et al.
patent: 4936803 (1990-06-01), Burge
patent: 5090929 (1992-02-01), Rieben
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