Several years ago I sold a Top Flight Holy Smoke to a friend. He snapped it hard and it went into a flat spin. The more elevator he used, the faster it spun. He wasn't able to recover, and it pancaked into the ground really hard. It didn't have rudder control. I suppose rudder may have helped, because he had no control in the flat / spinning attitude. If I build any delta again, I'll for sure have rudder on it!

John Wells