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Old 08-03-2009
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Question on Polar Diagrams

Currently sitting in hospital with plenty of spare time so have been reviewing a fair bit of yachting info. One thing I have is a polar diagram that I am trying to compare to my current boat and one thing I was wondering is how do they account for sea state? It is showing an optimum apparent wind angle of 32 degrees in 26 knots of wind. However 26 knots would normally throw up a fair bit of chop, which most boats would need to ease off a bit to make decent progress.

Any one have any ideas? I was thinking they probably assume flat water, which means in real life / choppy conditions you would need to add around 5 degrees to compare to a real life scenario.

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