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Polaire des vitesses
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===Vent arrière=== [[Image:Polaire parapente vent arriere 10kmh.png|thumb|764px|center|'''Polaire des vitesses par rapport au sol d'un parapente poussé par un vent arrière''']] Si le vent vient de derrière, la polaire est décalée vers la droite. Toutes les vitesses horizontales par rapport au sol sont augmentées de la vitesse du vent. Dans ce cas on voit que le meilleur plané s'obtient en freinant la voile un peu plus que sans vent. Cependant cette finesse max ne s'obtient jamais avec un freinage plus important que celui du taux de chute minimum.
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