The aircraft was observed to take off from Runway 15 and climb to about 500 feet before commencing a right turn. It then appeared to abruptly change attitude in pitch and roll a few times before adopting a nose low attitude and disappearing behind trees. The aircraft crashed into a shallow swamp and caught fire. On site examination revealed that the aircraft struck the ground in a steep nose and right wing low attitude. The pilot reported that the engine began running roughly and lost power shortly after takeoff. An examination found no fault with the engine or carburettor, however, fire damage precluded testing of the magnetos. The aircraft attitude at impact was indicative of it being in a stalled condition.