Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1979-03-08
1981-05-05
Blix, Trygve M.
Marine propulsion
Screw propeller
Having means to control flow around propeller
114152, B63H 128
Patent
active
042656265
ABSTRACT:
A trimming wedge is disclosed to trim a propeller driven boat for better performance. The wedge is fixed at its base to the center shaft housing of a propeller driven power boat. The trimming wedge extends approximately the length of one blade of the propeller and is positioned in front of and in line with the propeller blade. The trimming wedge or vane splits the water in front of the propeller so that the blade of the propeller passes through a void in the water. For example, when the wedge is positioned vertically downwardly from the shaft housing, the void occurs when the clockwise arc of the blade is in about the downward four o'clock to eight o'clock position when viewed from the rear. A trimming wedge with the proper wedge angle neutralizes the tendency of the propeller to "walk" the boat sideways or to the right with a clockwise turning propeller, thus transferring the side load thrust to forward thrust when the boat is propelled through the water, resulting in an increase in forward speed.
REFERENCES:
patent: 1780075 (1930-10-01), Griffith
patent: 2370212 (1945-02-01), Van Gorden
patent: 3976027 (1976-08-01), Jones
patent: 4096819 (1978-06-01), Evinrude
Blix Trygve M.
Sotelo Jesus D.
Upton Robert G.
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