Twin-rudder system for large ship

Details Twin-rudder system for large ship Twin-rudder system for large ship

2005-05-03

2005-05-03

Sotelo, Jesus D. (Department: 3617)

Ships

Steering mechanism

Rudders

Reexamination Certificate

active

06886485

ABSTRACT:
In such a high lift twin-rudder system that: a pair of high lift rudders1, 2is arranged behind a single propeller3; the respective high lift rudder1, 2has a top end plate6, 7and a bottom end plate8, 9at the top end and the bottom of a rudder blade4, 5; the respective rudder blade4, 5is provided with a reaction fin10, 11, protruding from an inboard face of the rudder blade4, 5on a nearly same level with the axis of the propeller3, that is originated nearly from the leading edge portion toward the rear and has a fixed chord length; the reaction fin10of the rudder blade4that faces on the board-side where the propeller blades rotate in the ascending direction assumes a posture that makes such attack angle that the ratio of a forward vectored thrust to a drag, both produced by a propeller slip stream having a stream component in the ascending direction, becomes maximum; and the reaction fin11of the rudder blade5that faces on the board-side where the propeller blades rotate in the descending direction assumes a posture that makes such attack angle that the ratio of a forward vectored thrust to a drag, both produced by a propeller slip stream having a stream component in the descending direction, becomes maximum, the respective rudder blade4, 5is so constituted that a chord length is of 60˜45% of a propeller diameter.

REFERENCES:
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