Rudders for high-speed ships

Details Rudders for high-speed ships Rudders for high-speed ships

2008-01-08

2008-01-08

Avila, Stephen (Department: 3617)

Ships

Steering mechanism

Rudders

Reexamination Certificate

active

07316194

ABSTRACT:
A high-speed water vessel including a steering arrangement for reducing cavitation and its effects. The arrangement includes a twisted rudder pair located downstream of a high-speed propulsor. The rudder pair may also be contoured at a bottom portion thereof. The propulsor has at least one propeller having a propeller diameter. In operation, the propulsor produces a slipstream that contracts with distance from the propeller. To avoid the effects of cavitation, the twisted rudder pair is positioned outside and adjacent to the slipstream diameter, with the rudders of the rudder pair separated by a distance that is less than the diameter of the propellers. The rudders of the rudder pair may be in a substantially parallel orientation with respect to each other. In gas turbine applications, the rudder pairs may be rotated towards each other to produce a rudder bucket for producing a negative thrust for stopping the high-speed water vessel.

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V. P. Bingham and Thomas P. Mackey, High-Performance Rudders -with Particular Reference to Schilling Rudder, Marine Technology, vol. 24, Oct. 1987, pp. 312-320.

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