speed on different tacks - SailNet Community

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Old 07-22-2012
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speed on different tacks

I sail a Columboa 8.7 circa 1977. The boat sails faster on starboard tack than on port - 6 knots vs 4.5 - 5 knots. Boat weight is evenly distributed - mast is straight. Tension on shrouds is OK. I have not checked with GPS. Can this be a knotmeter/paddlewheel problem?

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Old 07-22-2012
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Re: speed on different tacks

Clyde,

It absolutely could be.

Also look at trim placement, and rig tune. Side to side rig tension should be a little different due to small differences in rig geometry.
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Old 07-22-2012
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Re: speed on different tacks

I'd borrow a hand held GPS and check your speed with that. Be sure either to check it during slackwater time or else account for the current speed when you measure speed over ground (SOG) with your GPS.
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Old 07-23-2012
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speed on different tacks

If the paddle wheel isn't mounted midline, or if it's getting some turbulence from the keel or rudder, that could cause a problem. Is the problem consistent? Many times I notice a faster tack when I'm sailing, due to current or prevailing winds.
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Old 07-24-2012
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Re: speed on different tacks

I agree with Marcus. If your speedo is off to one side it is getting different flows off the keel and that could account for the different reading.
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