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Although these aircraft were among the highest performing sailplanes of their day, the configuration gradually lost its competitive edge when it began to appear that longitudinal stability and trim considerations would preclude the use of the new laminar airfoils then being introduced.
With features such as a laminar airfoil, exceptional surface quality, carefully hinged and blended ailerons and flaps, drogue chute, and water ballast, this sailplane represented the culmination of wooden sailplane development.
A decisive improvement came with the introduction of laminar airfoils.
That laminar airfoils such as the NACA 6-series offered considerable performance improvements was demonstrated in the early 1950's by the HKS l and the RJ-5 (see also A.
Nagele [97,190] to combine the aerodynamic potential o( the laminar airfoil with newly developed fiberglass technology.
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