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Area Presented to Wind Vs Heel Angle

Forum - Sailing Maneuvers - Area Presented to Wind Vs Heel Angle
Module Content - Sea Talks1
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Student
Mike Guthrie
Long Beach, CA, USA
Bareboat Charter Master Level V
Status: Really Big Time Sailor
Qualified days: 259
Area Presented to Wind Vs Heel Angle
Posted 2017, Apr 06 17:16
Why does sail area presented to wind decrease as heel angle increases? Is it that "vertical" sail area presented to wind decreases with heel but total sail area presented to wind does not change?
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Student
Mike Guthrie
Long Beach, CA, USA
Bareboat Charter Master Level V
Status: Really Big Time Sailor
Qualified days: 259
Reply 2017, Apr 06 17:18
Also how does heeling angle give the sails a foil shape?
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Grant Headifen
Reply 2017, Apr 06 17:58
Yes the wind is horizontal so it looks at the vertically presented sail area. As the boat heels the vertical distance to the top of the mast decreases as with the vertically presented sail area. Also see this blog on how heeling angle creates airfoil shape. http://www.nauticed.org/sailing-blog/how-does-heeling-angle-create-airfoil-shape/
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