I dont know what happened. The RV-4 was on its 3rd flight, winds at 15-20knts, and went deadstick about 30 ft up. I banked downwind to base and the RV-4 stalled out on its right wing and went straight in. Not enough airspeed or elevator to get it level. I did level the wings before it hit on its nose. It broke the engine box area completely off, broke the wing spar and tail. it was a total loss.