The pilot was participating in a local club competition the task being Benalla - The Rock - Rennie - Benalla. The pilot reported that he was attempting an outlanding in a paddock west-south-west of The Rock township on the eastern side of The Rock range. He started a right hand circuit at about 500 feet above ground level (agl). At about 200 feet agl as he was turning from the downwind to a base-final position the aircraft experienced very rapid sink. He attempted to recover with full forward stick but the aircraft went into a dive. Back stick had no effect so he maintained forward stick. Close to the ground as he was apparently recovering from the dive the aircraft struck some small branches and a wire fence. In order to avoid a large tree the pilot banked the aircraft to the left but the right wing struck the top of the tree. The aircraft rolled inverted and struck the ground upside down 50 metres beyond the tree. This accident was not the subject of a formal on-scene investigation.