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طول بال
FAI 15m class sailplanes are limited only by a 15m wingspan restriction.
wingspans exceeding 25m.
Featuring new airfoils and construction techniques, a 20.10 m wingspan, and an aspect ratio of 33.6, the sailplane achieved a glide ratio of 38 and a minimum sink speed of 0.55 nVs.
Several years later, the SB 7 was rebuilt with the wingspan increased from 15 to 17 m.
With a 29m wingspan, an aspect ratio of 36.7, and good fuselage aerodynamics, it became the first sailplane to achieve a glide ratio of 50:1.
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