Flap actuator control unit for a hydrofoil

Details Flap actuator control unit for a hydrofoil Flap actuator control unit for a hydrofoil

1975-06-11

1976-11-30

Kunin, Stephen G.

Ships

Building

Observation boats

B63B 118, B63B 124

Patent

active

039942538

ABSTRACT:
A novel flap actuator control unit for a hydrofoil craft. The control unit includes an actuator disposed in a submerged housing located in proximity to the hydrofoil control flaps, thus eliminating long, precise, and costly linkages needed on conventional flap actuator control units. To prevent sea water leakage into the actuator housing, the housing is filled with an inert fluid, such as oil, from a surge tank disposed above the waterline. When the hydrofoil is underway, the fluid is compressed or expanded by a free floating piston which responds to the external dynamic pressure thereby a balance between internal and external pressure is maintained and leakage into the actuator housing avoided.

REFERENCES:
patent: 3125975 (1964-03-01), Alsager et al.
patent: 3139059 (1964-06-01), Hanford, Jr.
patent: 3146457 (1964-08-01), Von Schertel
patent: 3364892 (1968-01-01), Persson et al.
patent: 3756180 (1973-09-01), Strickland et al.

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