"F1y1n" wrote in message

snip
amplitude and frequency does depend on the CG and gross weight, sure,
but a spin within the CG in an approved glider with a standard
airworthiness certificate is always benign can be recovered using the
documented procedures. As I said: 'well-behaved' and 'predictable'.

Up to the two turn JAR 22 test standard for modern gliders. Beyond that,
you are a test pilot.