Variable pitch propeller

Details Variable pitch propeller Variable pitch propeller

1989-12-12

1991-06-11

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Radially extensible or retractible rotor working member

Having pitch adjustment

416153, 416167, B63H 106

Patent

active

050228200

ABSTRACT:
An automatic variable pitch propeller including a central hub defining an axis of propeller rotation and a plurality of blades connected to and extending from the central hub substantially normal to the axis of rotation, each blade being mounted for rotation about a pitch axis, a cam mechanism to translate centrifugal forces imposed on that blade into a force tending to rotate that blade toward a course pitch, that force being opposed by water pressure tending to decrease blade pitch. The cam mechanism including a cam groove formed in an insert, of a material harder than the blades, in each blade shaft and the propeller being provided with variable minimum and maximum blade pitch stops, resilient bias toward minimum blade pitch and manual a pitch-up shift mechanism.

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