Fin tab device for marine vessels

Details Fin tab device for marine vessels Fin tab device for marine vessels

1987-11-06

1989-05-23

Basinger, Sherman D.

Ships

Steering mechanism

Rudders

114152, B63H 510

Patent

active

048319546

ABSTRACT:
A fin tab device for a marine vessel driven by a propeller is provided with a fin-shaped main fin tab member and a fin-shaped sub-fin tab member, both tab members extending downwardly from a substantially planar fixing portion detachably and adjustably secured to the bottom face of a stern structure. The two tab members are in an in-line, spaced-apart, tandem relation, the sub-fin tab member projecting downwardly a shorter distance than the main fin tab member. The sub-fin tab member is at a positon between the tip circle of the propeller and the main fin tab member. Cavitation bubbles first collide with the sub-fin tab member, imparting impact force thereto, whereby the lower end portion thereof is broken while the main fin tab member is shielded and protected by the sub-fin tab member.

REFERENCES:
patent: 2710587 (1955-06-01), Kutchar
patent: 2956533 (1960-10-01), De Yo
patent: 3080845 (1963-03-01), Pollak
patent: 3407774 (1968-10-01), Burke
patent: 3580208 (1971-05-01), Hinckley
patent: 3606852 (1971-09-01), Cafiero
patent: 4284025 (1981-08-01), Eckharp
patent: 4458622 (1984-07-01), Anderson
patent: 4468606 (1984-08-01), Quintal
patent: 4582011 (1986-04-01), Logan

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