![]() ![]() When the pilot of this aircraft flew slowly and carefully shifted her weight aft, she could induce a strong vortex over the top of the wing. To give the Fledgling a better lift-to-drag ratio, Grossruck and Kasper designed a wing with highly reflexed, trailing edges, and wingtip rudders that did triple duty as air brakes and vortex generators (a reflexed airfoil takes the shape of a flattened 'S'). Kasper had won Poland's national sailplane championship on four occasions before World War II, and he proposed that Grossruck make some striking modifications to the Fledgling. Grossruck sought the advice of polish-born sailplane pilot Witold Kasper. In 1976, a hang glider enthusiast named Steve Grossruck began exploring ways to increase the soaring performance of the Manta Products Fledgling (see Pterodactyl Fledgling in NASM collection). ![]()
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