Originally Posted by
cats_five
Was this a standard K21 without any tail ballast and no crash damage (the repairs can move CoG aftwards, obviously it should still be within limits)? I know one of our lightest instructors tried spinning one of ours solo (no ballast, undamaged) and she never managed to get it to spin. I also know two of our pilots did spin one with the tail weights and nearly failed to get it to recover.
Spin kit - Wikipedia, the free encyclopedia
http://www.alexander-schleicher.de/t...10_TM04A_E.pdf
Alexander Schleicher
(the last mentions the optional spin kit)
If you can spin a bog standard, unmodified one without a spin kit I'd love to know how.
Fly it at minimum weight, trim fully forwards, with wet wings (or some icing), at low level and in turbulent conditions. That should do it.