Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1982-03-15
1983-09-27
Blix, Trygve M.
Marine propulsion
Screw propeller
Having means to control flow around propeller
114286, B63H 506, B63B 122
Patent
active
044066350
ABSTRACT:
Essentially one-half of the circumference of the propeller of the marine vessel is arranged in a tunnel having a flow-favorable cross-sectional configuration which follows the flow lines of the water. At the starting region of the tunnel there is arranged a pivotable control plate which can be moved out of a retracted position where it lies in the surface of the tunnel into an extended position removed or remote from the aforesaid retracted position, in order to detach the flow of the water from the surface of the tunnel during rapid vessel travel. The propeller which is driven at a high rotational speed accordingly operates as a partially or semi-immersed propeller. The vessel floor and the control plate are interconnected by an elastically deformable cover plate which is secured to the vessel floor and the control plate in a bending or flexurally resistant fashion. This cover plate, both in the retracted as well as in the extended position of the control plate, affords a particularly flow-favorable covering of the gap or space formed between the vessel floor and the control plate. The front edge of the control plate is connected with the vessel hull by means of bearing or pillow blocks movable in the direction of travel of the vessel. The bearing blocks possess arm members which are increasingly elastically deformable in the direction of the retracted position of the control plate.
REFERENCES:
patent: 3159131 (1964-12-01), Frederick
patent: 3371642 (1968-03-01), Joy
patent: 3830190 (1974-08-01), Mantle
patent: 3938458 (1976-02-01), Irgens
patent: 4371350 (1983-02-01), Kruppa et al.
Blix Trygve M.
Corl Rodney
Escher Wyss GmbH
Kleeman Werner W.
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