Marine propeller with performance pitch, including five blade ve

Details Marine propeller with performance pitch, including five blade ve Marine propeller with performance pitch, including five blade ve

1989-12-13

1992-04-14

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416243, 416DIG2, 416DIG5, B63H 126

Patent

active

051042924

ABSTRACT:
A marine propeller (100) combines progressive pitch with both increasing pitch and increasing progressiveness of pitch along at least a portion of increasing radii from the axis of rotation to the outer blade tip. A five blade propeller is provided which accommodates thermal warpage of the outer blade tips, such that the same propeller includes two different types of blades, one blade having increasing pitch with increasing radii all the way to the outer blade tip, and the other type of blade having increasing pitch to a given radius and then decreasing pitch with increasing radii to the outer blade tip. The latter blade type is preferred and has a hump in the pressure surface at the noted given radius between portions of increasing and decreasing pitch with increasing radii.

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"Everything You Need To Know About Propellers", Third Edition; Mercury Marine, Brunswick Corporation, OS5-384, 10-M, Part No. 90-86144, 1984.
Columbian Bronze Corp. Cat. (1968), p. 6, "Pentadyne".

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