French Deutch
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More:      The basic idea         Driving force    Upwind driving Force    Lift & Drag   

Air flow

Wings - The angle of attack as well as the aerodynamic efficiency, are kept in all wind directions.

Sails -  The larger the angle of attack, the smaller the aerodynamic efficiency.

 

 

 

 "Omer" – soft and variable geometry wing sail


 

 



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