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post #19 of Old 04-03-2019
colemj
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Re: Generic Polars

You don't need highly calibrated instruments to show optimum VMG in relative terms. Ours are always calculating VMG, and we don't use them to know the exact VMG - just to trim and sail the boat to the maximum VMG they show. Whether that absolute number is real or not is inconsequential. This works well, unless one thinks that the instrument calibrations are constantly changing in short terms. If they are, then they aren't very useful for anything, let alone VMG.

Our autopilot has an upwind setting to sail at maximum VMG, where it constantly monitors boat speed and wind and adjusts course so that VMG is optimum. Like us, it doesn't care about the absolute VMG number - only that it sails at the highest VMG calculated.

Mark

Manta 40 Catamaran "Reach"

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