Vessel speed detecting device

Details Vessel speed detecting device Vessel speed detecting device

1988-10-14

1990-04-10

Woodiel, Donald O.

Measuring and testing

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Ship's log

G01C 2110

Patent

active

049149458

ABSTRACT:
A number of embodiments of watercraft speed detecting devices embodying a dynamic semiconductor pressure sensor that has high accuracies at most speed ranges and another speed sensor that has a higher degree of accuracy than the semiconductor pressure sensor at a certain range and that speed is displayed at that certain range. The other speed sensor may be of a wide variety of types such as a magnetic current meter, a propeller type speed sensor, or a tachometer that is driven by the engine and associated circuitry for calculating watercraft speed from engine speed.

REFERENCES:
patent: 1525963 (1925-02-01), Sperry
patent: 4103161 (1978-07-01), Thomasson
patent: 4759216 (1988-07-01), Carpenter et al.
patent: 4821567 (1989-04-01), Nakamura et al.

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