G - Physics
01
P
73/68
G01P 5/07 (2006.01)
Patent
CA 1313775
MARINE INSTRUMENT Abstract of the Disclosure 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 low speed characteristics provided by a housing which extends the paddle wheel into the water below the hull. The bow o f the housing provides a new leading edge, generating a smaller thickness boundary layer at the paddlewheel, so that the paddles project beyond the layer at low speeds. High speed performance is improved by having a high ratio o f paddle fore-to-aft drag coefficient shape; keeping the periphery of the paddlewheel hub within, or flush with, the bottom of the cavity; a low paddle projection versus paddlewheel radius ratio; and by keeping the ratio of paddle cross-section versus available cavity cross-sectional space within an optimum range.
557459
Airmar Technology Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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