French Deutch
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More:      The basic idea         Air Flow    Upwind driving Force    Lift & Drag   

Driving force

Wings - The angle of attack as well as the aerodynamic efficiency, are kept in all wind directions.
Sails - Over 200  AOA, the aerodynamic efficiency is smaller (lift is smaller and drag is bigger). In very large AOA, drag becomes the driving force.  



 "Omer" – soft and variable geometry wing sail


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