Join Date: Jun 2005
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One other thing to keep in mind, along with wind speed, is sea conditions.
In general, you want sails fuller in light air and flatter in heavy.
But also, if you're trying to punch through a sloppy sea, you need the sails a little fuller than in a calm sea, think of it as a lower gear on a car or bike, to give you more power when the seas make your trip a little more "uphill".
Windspeed is the primary factor, but sea condition, though secondary, is still important.