Whilst taking off, the aircraft’s lower right wing struck standing crops adjacent to the grass airstrip. Travelling at about 35 kt, the aircraft yawed to the right through about 120°, causing the lower left wing to strike the ground. The aircraft then tipped forward onto its nose and the propeller also struck the ground, causing the engine to stop. The pilot, who was wearing a full harness and protective helmet, was uninjured. He reported that weather conditions had been fine, with a light wind blowing directly along the airstrip.