[Edit] 
No, it's quadrupled
When the apparent wind speed is doubled, the pressure on the sail is quadrupled. That is because the pressure on the sail (or the side of your house or a billboard sign) is proportional to the square of the speed of the wind. If the wind speed triples, then the pressure goes up by a factor of nine, because three squared is nine.
First answer by Schnazola. Last edit by Schnazola. Contributor trust: 1228 [recommend contributor]. Question popularity: 45 [recommend question]
Answers.com > Wiki Answers > Categories > Sports > Sailing > When the wind doubles does the pressure in the sails increase 8 times?
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How much wind before you need to re-reef the sails?
