Keep in mind OWTW is a 35 - the sensor is perhaps 2' outboard, to port,
from the keel and about 3' forward of the mast. She came with
Datamarine instrumentation which I replaced with Raymarine gear two
years ago. Changing the sensor is very simple and is mostly a matter of
re-running the wire from the display to the sensor through-hull.

Cheers,
   Rick

Cindy Ballreich wrote:

> 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.)
>
>
> Richard B. Emerson wrote:
>
>> [...]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).
>
>


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Received on Sat Feb 11 21:07:49 2006