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Old 28th May 2013, 09:25 AM   #2
Farlo
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Join Date: Aug 2006
Posts: 528
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Air density decreases with temperature. For a given windspeed you need smaller sails in winter. From 35 to 5C it goes from 1,14 to 1.27 so you get an equivalent "push" with a 7.7 sail (roughly).

Air density also drops with altitude. I've seen people windsurfing at lake Mont Cenis in the Alps (~2500m) with very large sails though it was quite windy. They told me that otherwise they woul not plane at all.
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