Extendable and retractable propeller for watercraft

Details Extendable and retractable propeller for watercraft Extendable and retractable propeller for watercraft

1979-06-12

1980-06-10

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Working member foldable, pivotable or collapsible to non-use...

416148, 416175, B63H 124

Patent

active

042070287

ABSTRACT:
For a watercraft which may be a powered craft or a sailboat with an auxiliary engine, a propeller which will pivot relative to its propeller shaft about an axis extending transversely of the propeller shaft so that the propeller retracts into general longitudinal alignment with the propeller shaft. The propeller includes two blades fixed to each other as a unit with a pivot pin passage formed at the juncture of the two blades. In one preferred form, one of the propeller blades is made larger than the other with the smaller blade positioned rearwardly in relation to the pivot pin passage and the larger blade forwardly of the passage. Furthermore, in this embodiment, the pivot pin passage extends at a relatively slight teetering angle to a plane extending perpendicular to the propeller shaft axis.

REFERENCES:
patent: 1491997 (1924-04-01), Messick
patent: 1899650 (1933-02-01), Stelzer
patent: 2222444 (1940-11-01), Schmidt et al.
patent: 2231464 (1941-02-01), Dubbs
patent: 2481751 (1949-09-01), James
patent: 3575530 (1971-04-01), Hall
patent: 3981613 (1976-09-01), Ehrenskjold et al.

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