Control tab assisted lift reducing system for underwater...

Ships – Submersible device – Having attitude control

Reexamination Certificate

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Details

C114S280000, C114S285000

Reexamination Certificate

active

06227139

ABSTRACT:

BACKGROUND OF THE INVENTION
Certain types of marine vessels such as submarines and hybrid hydrofoil vehicles are provided with underwater hydrofoil stabilizers having trailing edge control flaps subject to undesirable pivotal deflection by control surface jamming to adversely effect vessel maneuvering control. Control tabs have been utilized on airfoil flaps associated with aircraft and on hydrofoil flaps associated with surface ships and submersible seawater vessels to modify control of surface lift forces by deflection of the flaps. Such prior art use of control surface tabs has not however been applied to underwater marine vessel hull installations to address control surface jam problems.
SUMMARY OF THE INVENTION
In accordance with the present invention, trailing-edge control tabs are mounted on movable flaps of certain underwater vessel installations to assist in vessel maneuvering control by reducing undesirable lift produced as a result of jamming of a flap pivotally mounted on a stabilizer fixed to the underwater hull of the vessel. The invention applies to partial span flap configurations respectively formed by pairs of movable flaps mounted on fixed stabilizers. A trailing-edge control tab is pivotally mounted on each of the movable flaps for deflection independently of the other control tab. Thus, when one of two control flaps gets jammed with resulting undesirable lift force exerted on it in one direction, both of the trailing-edge control tabs are deflected in opposite directions to substantially add to the counter-effect of the other control flap associated with the unaffected surface span, by virtue of its deflection in said direction opposite to the deflection direction of the flap on the jammed surface span.


REFERENCES:
patent: 1661114 (1928-02-01), Flettner
patent: 2562227 (1951-07-01), Zobel
patent: 2658701 (1953-11-01), Robertson
patent: 2804038 (1957-08-01), Barkla
patent: 3520264 (1970-07-01), Scherer
patent: 3977348 (1976-08-01), Bordat et al.
patent: 4100876 (1978-07-01), Feleus
patent: 4213587 (1980-07-01), Roeseler et al.
patent: 4345538 (1982-08-01), Warner et al.
patent: 5237947 (1993-08-01), Manning
patent: 5366176 (1994-11-01), Loewy et al.
patent: 5520137 (1996-05-01), Arii et al.

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