Spin kit
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A few sailplanes are very difficult, if not impossible, to spin under normal conditions. To make these sailplanes spin easily for training purposes or demonstrations a spin kit is available from the manufacturer.
It consists of ballast weights (usually discs) applied to the tail to move the centre of gravity rearward. This increases the instability of the glider enabling it to spin.
[edit] Sources
- Schleicher ASK21 Flight Manual
