Bert Willing wrote:
I would never dream of spinning a ballasted wing intenionally - especially
if you have water bags instead of tanks.
There is no reason whatsoever that the bags should resist to the water
rushing into the wingtip section, and when they burst you are in deep ****.

The ballast greatly increases the glider's rotational inertia, which
probably has a bad effect on spin recovery. Partially full bags or tanks
could yiedl interesting results, too.
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Eric Greenwell
Washington State
USA