Dual rudder assembly

Details Dual rudder assembly Dual rudder assembly

1976-03-04

1978-04-25

Blix, Trygve M.

Ships

Steering mechanism

Rudders

115 42, B63H 2506

Patent

active

040856941

ABSTRACT:
A rudder assembly for a ship having an upright keel plane and a drive for generating a screw race passing backwardly along the plane comprises a pair of like rudders lying in the race and pivotal about respective upright axes spaced symmetrically to opposite sides of the keel plane. Each rudder has a central plane lying parallel to the keel plane during normal straight forward travel of the ship and has a non-concave inner face turned toward the keel plane and an outer face formed by a convex front portion generally in front of the respective axis and a concave rear portion generally behind the respective axis. The rear portions diverge from the respective central planes by angles between 2.degree. and 10.degree., and the inner face has a rear portion similarly forming an angle of between 2.degree. and 8.degree. with the respective central plane. These rudders may be controlled individually in order to stop and even reverse the ship with a continuously backwardly moving screw race. In addition a pair of such rudders may be provided on a twin-screw ship, one for each screw race.

REFERENCES:
patent: 899359 (1908-09-01), Wadagaki
patent: 969642 (1910-09-01), Lund
patent: 3101693 (1963-08-01), Schilling
patent: 3137265 (1964-06-01), Meyerhoff
patent: 3442244 (1969-05-01), Clark et al.
patent: 3487805 (1970-01-01), Satterthwaite et al.
patent: 3872817 (1975-03-01), Duryea

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