Marine propulsion – Screw propeller – Variable pitch
Patent
1984-02-24
1986-01-21
Blix, Trygve M.
Marine propulsion
Screw propeller
Variable pitch
440 49, 416 87, B64C 1128
Patent
active
045655316
ABSTRACT:
An improved efficiency propulsion system and method of improving the efficiency of a vessel operated in deep and shallow water depths and at constant or variable loaded and ballast waterlines contemplates the use of a variable diameter propeller means capable of varying between a maximum extended diameter D and a minimum effective diameter D mounted on a propeller shaft having an axis of rotation displaced from the bottom keel of the ship a distance less than one-half the maximum diameter D of the propeller means. In this way, because of the use of the variable diameter ship propeller, the propulsion shaft may be located closer than otherwise permissible to the bottom keel of the ship which has the result of lowering the top blade tip trajectory relative to any particular chosen waterline and also providing space for a generally larger diameter more efficient propeller installation. Additionally, because of the ability to decrease the diameter of the propeller when desired, the bottom blade tips of the propeller may be maintained above the bottom keel of the ship when the ship is operating in shallow waters. However, upon return to deep water depths in the open sea, the diameter of the propeller may be extended to gain optimum operating efficiency.
REFERENCES:
patent: 2481751 (1949-09-01), James
patent: 2528609 (1950-11-01), Rouse
patent: 3565544 (1971-02-01), Marshall
patent: 3606571 (1971-09-01), Wood
patent: 4142697 (1979-03-01), Fradenburgh
patent: 4427341 (1984-01-01), Eichler
Bartz C. T.
Blix Trygve M.
Exxon Research and Engineering Co.
Wohlers Donald F.
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