Rick,

Where is your knot meter sensor located? Ours is just forward and
starboard of the compression post in the head plumbing cabinet. You
replaced yours recently, didn't you? Did you have trouble replacing the
sensor? (Ours hasn't worked since we got the boat, although the paddle
wheel turns smoothly.)

Cindy


Richard B. Emerson wrote:
> The multiplier is directly dependent on the hull form and varies a lot.
> 1.37 seems somewhat high for a Baba hull and perhaps closer to right for
> a boat with a lot of forefoot cut away and possibly a skeg hung rudder.
> If, however, the number comes from Bob Perry, I'll bow to his wisdom.
> [grin]
>
> Knotmeter readings are subject to flow around the keel as well as simple
> motion through the water. On OWTW, we have a "fast side" and a "slow
> side". The knotmeter reads high (relative to GPS SOG) on, IIRC, port
> tack and low on starboard tack. Water flowing "over" the keel is
> accelerated slightly relative to water flowing "under" the keel
> (thinking of the keel as a lifting foil), and the knotmeter sensor sees
> that (which is why, ideally, the sensor should 1/3 the distance from the
> keel to the waterline - to avoid the accelerated water flow).
>
> Cheers,
> Rick


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Received on Sat Feb 11 09:27:37 2006