The pilot was mustering sheep on his property and had handed off two mobs to ground handlers. He was on his fourth pass and was in a 45 degree left turn, descending from 100 to 50 ft at about 70 kts when he realised that he was too close to the sheep and applied left rudder to slip the aircraft away from the sheep. He then attempted to bring the wings level with aileron and arrest the descent without releasing the left rudder pressure. As the aircraft approached 50 ft, the pilot realised he could not recover and closed the throttle. The aircraft struck the ground with the left wing. The propeller then contacted the ground and the aircraft cartwheeled, coming to rest in a distance of about 40 m facing 180 degrees from the direction of flight.