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بارگذاری بال
Neglecting the effects of the relatively small Reynolds number variations, every sailplane has a single drag polar, regardless of wing loading.
The airspeed polar, however, varies with the wing loading and can be calculated from the drag polar.
In order to provide a uniform basis for comparison, the Idafiieg airspeed polars are always presented for a wing loading based on empty mass plus 90 kg (180 kg for multiplace sailplanes).
given wing loading.
For example, in some cases a relatively thick airfoil, optimized for climb, together with a high wing loading, can provide as good a result as a relatively thin airfoil and reduced wing loading.
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