Someone has measured the pressure between leeward side and windward side, and it was zero. How is that possible?
Because The pressure difference between leeward and windward is not that much, and is thereby hard to measure. It is in general much easier to measure the sailforce and then devide it by the sail area. The result will be the average pressuredifference. 13 In your theory of sail you mention that the sailforce is perpendicular to the boom, while in your tuning theory you mention that putting the draft more forward help directing the sailforce more forward. You make a mess of it!. I wanted to keep the sail theory, the theory of couples and forces understandable for many people. In general the sailforce is more directed forward as perpendicular to the boom.
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