Designated Fa 269, this single-seat fighter convertiplane project resulted from a design study order issued by the RLM to FockeAchgelis in 1941 which called for a local defence fighter combining the VTOL capabilities of the helicopter with the speed and economy of a conventional fixed-wing aircraft. From the outset it was obvious that the project would be highly innovative and when the basic concept of the Fa 269 had been finalised, it was calculated by the FockeAchgelis staff that it would take at least five years to bring the project to fruition.
The Fa 269 was to have been powered by a single BMW 801 air-cooled radial engine which was to have been buried in the fuselage aft of the pilot's cockpit and was to have driven transverse drive shafts in the leading edges of the fixed wing, these shafts turning, via synchronised gearboxes, three-bladed rotors, the plane of rotation of which could be swivelled through 80 deg by angled extension shafts. The Fa 269, it was proposed, would adopt a high angle of attack when at rest, this being achieved by means of immensely long undercarriage members, the main units of which were to retract aft into wells behind the engine bay. For vertical take-off, the rotors would be lowered to the maximum extent of the swivelling extension shafts, the plane of rotation then being parallel with the ground. For translation to conventional flight after take-off, the extension shafts were to pivot aft, the rotors thereafter operating as pusher propellers.
A mid-wing monoplane, the Fa 269 had a span of 10,00 m, a length of 8,93 m and a height of 3,23 m, armament was to have comprised two 30-mm MK 108 cannon and it was calculated that maximum speed would be of the order of 570 km/h. A considerable amount of tunnel testing was undertaken, together with work on gearboxes, drives and power-pivoting mechanisms, and a full-scale mock-up was built, but much of this was destroyed by bombing and work was finally shelved in 1944 when conservative estimates indicated that there was little likelihood of a practical prototype being available for testing before1947.
Focke-Achgelis Fa 269
Fa 269 model in wind tunnel
Air International Jan. 1975
Focke by Enno Springmann
Die Deutsche Luftrustung by Nowarra