Control tab assisted lift reducing system for underwater hydrofoil surface
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsThang D. Nguyen, Scott Gowing
Life of this patent
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Abstract
A hydrofoil stabilizer fixed to an underwater hull and provided with a pair of pivotally deflectable control flaps through which surface lift on the stabilizer is controlled, is provided with trailing edge tabs on both of the flaps that are pivotally deflected in the same direction to further offset and thereby improve recovery from surface jam inducing lift force on the stabilizer which adversely affects maneuvering control.
Claims5
In combination with a marine vessel having a hull undergoing underwater travel and a hydrofoil stabilizer fixed to the hull as part of a lift surface control system having a pair of control flaps mounted on the stabilizer for pivotal deflection independently of each other to effect recovery from jam by the pivotal deflection of one of the flaps in a direction opposite to the pivotal deflection of the other of the flaps induced by said jam during said underwater travel of the hull, the improvement residing in means for improving said recovery from the jam, comprising:
- a pair of tabs;
- and means respectively mounting the tabs on said flaps for pivotal deflection in the same direction opposite to the direction of flap deflection induced by said jam with respect to said other of the flaps.
In combination with a marine vessel having a hull undergoing underwater travel and a hydrofoil stabilizer fixed to the hull as part of a lift surface control system having a pair of control flaps mounted on the stabilizer for pivotal deflection independently of each other to effect recovery from jam inducing undesirable pivotal deflection of one of the control flaps, the improvement residing in means for improving said recovery from the jam, comprising:
- a pair of tabs;
- and means respectively mounting the tabs on said flaps for pivotal deflection in the same direction opposite to the undesirable pivotal deflection induced by said jam.
Dependencies are inferred from the claim text.