Rhein-Flugzeugbau
RFB/Grumman American Fanliner
The RFB/Grumman American Fanliner, developed by the German company Rhein‑Flugzeugbau (RFB) in the early 1970s, was an experimental light aircraft that explored the use of a ducted‑fan propulsion system. The project began in 1972 as a joint venture with Grumman, which provided financial backing and marketing support for a potential U.S. production line. The prototype, designated RFB/21, first flew on 19 August 1973 powered by a 105‑hp Lycoming engine driving a 1.1‑metre diameter shrouded fan mounted in the rear of the fuselage. The fan generated thrust through a duct, giving the aircraft low noise levels, reduced vibration, and improved fuel efficiency compared to conventional propellers of the era. Its all‑metal low‑wing design incorporated a tricycle undercarriage and a spacious side‑by‑side cockpit with excellent visibility. Although the Fanliner demonstrated promising performance – a cruise speed of about 180 km/h with a modest powerplant and short take‑off capability – certification difficulties, high development costs, and limited market interest led to the program’s cancellation in 1976 after only a few prototypes were built. The Fanliner remains a noteworthy example of early attempts to integrate ducted‑fan technology into general aviation, influencing later research into electric and hybrid propulsion concepts.
