Variable pitch boat prop

Details Variable pitch boat prop Variable pitch boat prop

1994-12-20

1996-06-18

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416164, 416153, B63H 304

Patent

active

055271545

ABSTRACT:
A variable pitch boat prop includes a hub fixed to the prop shaft, a sleeve surrounding the hub and having bearings which receive stub shafts from a plurality of blades. The stub shafts pivot in the bearings, so that the blade pitch can change. Pinion teeth formed on the stub shafts mate with respective toothed racks fixed to the hub and disposed at an acute angle to the hub axis. The center of pressure of each blade is offset downstream from the stub shaft axis, so that dynamic pressure on the blades tends to decrease blade pitch, while the rack and pinion tend to increase blade pitch. These opposing moments are at equilibrium at different blade pitches, according to the speed of the boat and the prop shaft torque. Blade pitch increases automatically as speed increases, and decreases at load increases.

REFERENCES:
patent: 524500 (1894-08-01), Hindes
patent: 1980248 (1934-11-01), Bates
patent: 1982170 (1934-11-01), Lansing
patent: 3095932 (1963-07-01), Hercules
patent: 3295610 (1967-01-01), Frias
patent: 3310118 (1967-03-01), Smith
patent: 3331446 (1967-07-01), Feroy
patent: 4792279 (1988-12-01), Bergeron
patent: 4929153 (1990-05-01), Speer
patent: 5022820 (1991-06-01), Bergeron
patent: 5032057 (1991-07-01), Speer
patent: 5145318 (1992-09-01), Olson

Affiliated with

Also associated with

Rating

Variable pitch boat prop does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable pitch boat prop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable pitch boat prop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-218584