Ancient greek - 1 1/2 turn competition spins are done from 3000-3500ft, (well that's the aim, entry may end up being in the high 2000's) often with a high rotation element so that thde exit is vertical. the trick is to do it in a plane designed for proper aerobatics, unlike say a slingsby or bulldog. Of course at that height a 'chute is probably not going to help much. I'm sure though slingsby's have been flown in many competitions