Damped automatic variable pitch marine propeller

Details Damped automatic variable pitch marine propeller Damped automatic variable pitch marine propeller

B - Operations, Transporting

63

H

B63H 1/06 (2006.01) B63H 1/28 (2006.01) B63H 3/00 (2006.01)

Patent

CA 2086336

2086336 9219493 PCTABS00017 There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades (20), each independently rotatable, relative to the propeller hub (10), between a first lower and a second higher pitch. The blades (20) are preferably mechanically linked by coordinating means (25) and are caused to move preferably by a combination of centrifugal force effect resulting from inertial mass means and the hydrodynamic forces acting upon the blade hydrodynamic surface. The rotation of the blades (20) relative to the propeller hub (10) is limited primarily as to speed of rotation by restricted viscous fluid flow damping means (3000) operably connected to the blades (20). In one preferred embodiment, the viscous flow means (3000) further acts as an initial restraint against all motion by closing off the viscous flow orifice (430) until a certain minimum propeller rotational speed is achieved.

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