Marine propulsion – Screw propeller – Combined with rudder
Patent
1986-04-18
1987-11-24
Basinger, Sherman D.
Marine propulsion
Screw propeller
Combined with rudder
440 66, 440 78, B63H 2548, B63H 516
Patent
active
047086726
ABSTRACT:
A boat stabilizer is disclosed for substantially eliminating "porpoising" or up and down movement of the bow portion of a boat as the boat is moving through the water. The stabilizer includes a wedge-shaped member formed on an adjustably mounted trim tab located on the underside of an anti-cavitation plate of an outboard motor. The wedge-shaped member has a downwardly inclined lower surface extending generally laterally from and perpendicularly to a fin-shaped member of the trim tab. Movement of the boat through the water imparts a force against the downwardly inclined surface to effect a generally vertical torque on the boat substantially eliminating porpoising of the boat in a given speed range. The force imparted against the downwardly inclined surface is proportional to the angle of attack of the downwardly inclined surface so that upward displacement of the bow of the boat moving through the water is opposed by a proportionately greater force on the downwardly inclined surface. A number of stabilizers are provided with the angle of the downwardly inclined surface relative to the anti-cavitation plate being different for each stabilizer so that an appropriate stabilizer can be selected for different boat/outboard motor combinations.
REFERENCES:
patent: 2564903 (1951-08-01), Irgens
patent: 2860594 (1958-11-01), Kiekhaefer
patent: 3516378 (1970-06-01), Linsley
patent: 3955527 (1976-05-01), Holtermann
patent: 3980035 (1976-09-01), Johansson
patent: 4205618 (1980-06-01), Olsson
patent: 4352666 (1982-10-01), McGowan
patent: 4487152 (1984-12-01), Larson
Bentz L. Earl
Summerford Roark H.
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