Inboard servo for marine controllable pitch propellers

Details Inboard servo for marine controllable pitch propellers Inboard servo for marine controllable pitch propellers

1992-03-23

1993-05-25

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

With measuring, testing, signalling or inspection means

416157R, 416164, 367 99, 91 1, 92 5R, B63H 308

Patent

active

052134725

ABSTRACT:
An inboard servo for a controllable pitch propeller of the force rod type comprises a feedback device comprising a feedback ring located externally of the propeller drive shaft, affixed to the force rod for rotation and axial translation therewith and having a planar surface perpendicular to the propeller drive shaft axis, and a distance-measuring device for substantially continuously detecting the position of the ring, and therefore the position of the force rod. The distance-measuring device directs a high frequency pulsed signal onto the ring surface from a fixed position spaced apart therefrom, detects the signal as it is reflected by the ring surface from a fixed position spaced apart therefrom, and processes the directed and reflected signals to produce a signal indicative of the position of the ring surface based on the time difference between the pulses directed onto the ring surface and the pulses reflected from the ring surface.

REFERENCES:
patent: 2307040 (1943-01-01), Hammond
patent: 4542652 (1985-09-01), Reuter et al.
patent: 4543649 (1985-09-01), Head et al.
patent: 4872811 (1989-10-01), Cavallaro et al.
patent: 4906213 (1990-03-01), Esthimer
patent: 4964104 (1990-10-01), Capurka

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