@ Cats_Five - I've flown with enough students who have inadvertantly stalled a K-21. Some of them have needed prompting to recover and one therefore wonders what would have happened if I wasn't in the backseat. Ok, they were pre-solo and so it was a useful reinforcement exercise but I hope that the point is clear...pilots can and do stall gliders (and the K-21 is no exception). As for whether the K-21 can/does spin...I'd suggest re-reading the K-21 Flight Manual about an unusual situation which may cause it to spin! I reiterate my previous point too - gliders such as the K-21 are very spin resistant but given the right circumstances they will. The fact that there don't appear to be any spin recovery failure accidents on the BGA database is good but I don't know if this is the case for every other country.