Ships – Steering mechanism – Rudders
Patent
1995-04-21
1995-10-10
Swinehart, Edwin L.
Ships
Steering mechanism
Rudders
B63H 2506
Patent
active
054562007
ABSTRACT:
Ship rudders are subjected to propeller induced velocities and induced flow ngles that vary along the rudder span and chord. Because of non-zero onset flow angles, a suction pressure peak is formed at or near the leading edge of the rudder where early cavitation occurs. The present invention is directed to a rudder and method for minimizing early cavitation and related ship vibration and for thus improving acoustic and hydrodynamic performance thereof. The rudder of the present invention is twisted so as to have profiles along its entire span that are aligned with propeller induced non-zero onset flow angles into the rudder. The twist of the rudder sections vary in the spanwise direction, that is, the twist angle of one rudder sections may vary relative to the twist angle of adjacent or remaining rudder sections, such that the rudder experiences substantially zero angles of attack along the span from the rudder's root to the rudder's tip. Moreover, each individual rudder section may be twisted in the chordwise direction to substantially align the individual sections with the incoming flow along the entire chord from the rudder's leading edge to the rudder's trailing edge.
REFERENCES:
patent: 1699931 (1929-01-01), Tutin
patent: 1705133 (1929-03-01), Oertz
patent: 1714042 (1929-05-01), Oertz
patent: 1744138 (1930-01-01), Oertz
patent: 1844303 (1932-02-01), Wagner
patent: 1973783 (1934-09-01), Thornsen
patent: 2331706 (1943-10-01), Livingston
patent: 2392165 (1946-01-01), Livingston
Borda Gary G.
Swinehart Edwin L.
The United States of America as represented by the Secretary of
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