Marine instrument

Details Marine instrument Marine instrument

1996-02-12

1996-12-03

Chilcot, Richard

Measuring and testing

Navigation

Ship's log

73185, G01C 2100

Patent

active

055810250

ABSTRACT:
A through-hull speed sensor of the magnetized paddlewheel sensor type wherein a paddlewheel is rotatably supported in a cavity adjacent a magnetic sensing device which generates electrical pulses corresponding to paddlewheel speed as the wheel rotates when the vessel moves through water. The sensor has improved linearity provided by a flow channel recessed in a downstream surface of a sensor mounting member. The recessed flow channel raises the trailing edge above the leading edge, thereby reducing pressure on a back wall of the cavity where the pressure is due to fluid flow through the paddlewheel.

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patent: 4644787 (1987-02-01), Boucher et al.
patent: 4898029 (1990-02-01), Boucher
patent: 5186050 (1993-02-01), Lagace et al.
patent: 5369360 (1994-11-01), Amyot

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