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post #11 of 14 Old 03-22-2013
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Re: Paddle Wheel Speedometer

If you're sailing in places like the PNW with lots of debris in the water, like logs, perhaps this was to protect the speedo impeller?
I also find a speedo a welcome addition to our GPS info.
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post #12 of 14 Old 03-23-2013
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Re: Paddle Wheel Speedometer

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Originally Posted by Cmdr311 View Post
I think the purpose is to keep seaweed from fouling the paddle wheel. I can always put it back on next year if the speedo fouls excessively.
I doubt it. In 20,000+ hull cleanings, I have never seen seaweed foul a knotmeter paddlewheel.
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post #13 of 14 Old 03-23-2013
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Re: Paddle Wheel Speedometer

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Originally Posted by capta View Post
If you're sailing in places like the PNW with lots of debris in the water, like logs, perhaps this was to protect the speedo impeller?
I also find a speedo a welcome addition to our GPS info.
The impeller is probably more vulnerable to that stuff in the traditional location on the bow. We had an impeller get knocked right out of the thru-hull by a chunk of wood during a distance race. We didn't know about it until someone jumped down below to get something and splashed into ankle deep water!

I wonder what the flow on the keel would be doing when the boat is heeled over, and maybe making some leeway. Would it flow straight back the way the impeller is aligned, or will there be a down element to the flow angle? That would affect the accuracy of the knot meter I would think. So are they trying to straighten a bit of the flow at the knot meter?

Whatever it is it is a very strange thing to have sticking out of the side of your keel.

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post #14 of 14 Old 03-23-2013
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Re: Paddle Wheel Speedometer

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Originally Posted by capta View Post
...
I also find a speedo a welcome addition to our GPS info.
I, too, appreciate having a speedo in addition to GPS. Knowing how fast you are going through the water and over the ground is very useful information in many situations in tidal waters and in the ocean where there are currents.
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