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Re:Boat Speedometers

At 14:55 9/14/98 -0500, you wrote:
In a discussion of relative velocity today, a student asked how boat
speedometers work-- like speedboats. I wasn't sure and thought I'd better
ask. Do they measure the speed of the water flowing past a point, or by a
difference in pressure?

Patti Mason
Delphi HIgh School
Delphi, IN


Some sensors I seem to recall
1) A little plastic turbine wheel.
2) A little plastic sprung drag finger
3) a little plastic water pitot

....all fitted at the lower edge of the transom.

Brian
brian whatcott <inet@intellisys.net>
Altus OK