Conceived as a motor glider and sport touring aircraft, the RF 4 was introduced in 1966. It is of all-wood construction and is fully
aerobatic. The
landing gear consists of a
monowheel gear which retracts forward into a
fibreglass cowling. The main wheel has a brake which is manually operated. There is a small steerable tailwheel and wing-mounted outrigger wheels. ==Operational history==