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Spin tests are required tor all configurations, including the entire center of gravity range and asymmetric water ballast (unless the design of the ballast system makes this condition unlikely).
Although water ballast may not be used, a water ballast system may be installed on the aircraft.
For example, as originally introduced in the late 1950's, the Standard Class prohibited retractable landing gear and water ballast, both of which were allowed by the end of the 1960's.
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.
The combination of lightweight structures and the trend towards increased water ballast capacity makes possible large variations in wing loading.
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