It's hard to imagine anyone trying to trim their model so it WONT SPIN[:'(]! If you power off any of my planes in a spin you will make the recovery a sloppy mess, and with nuetral ailerons you clean up the spin, but that's not the key to recovery. Pointing the nose down is the #1 on the "to do" list. If the tail of the plane has too much angular momentum for the rudder to overcome, a panicked pilot might give up on opposite rudder if it doesn't work right away. The key to recovery is to have a plan , and stick to your guns, because it might take a few seconds for the corrective measures to work. The lighter the plane, the easier the recover.