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Author
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Topic: WindCalc: Why compute apparent wind
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David Burch
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posted July 31, 2023 11:44 AM
We obviously know the apparent wind we are in, and indeed the most common conversion is to find true wind from this apparent wind.
But when we get a wind forecast for a notable change in wind speed and direction, we need to figure the best sails to set and indeed what will be the best course to the mark in the new wind.
For this we can turn to our polar diagram to find out what boat speed we expect on a specific heading in the new wind, and then knowing that heading and speed along with the forecasted true wind speed we can compute the apparent wind we expect on that heading, and from there reiterate the computations to look into other headings to find the optimum sails, heading, and expected boat speed.
From: Starpath, Seattle, WA
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