L/D ratio at a reasonably high speed to allow flight between thermals. A first flight and preliminary testing was carried out in July 1933, with the aircraft being completed at the Wasserkuppe during the 1933 Rhön contest. One built. FVA-10a Theodor Bienen The FVA-10a was a progressive development of the 'FVA-9' with a cantilever gull wing. The fuselage lines were smoothed and particular attention was paid to the wing fuselage junction. Initial tests were carried out at Merzbrück, in 1936, without a cockpit cover and testing continued at Prien where the canopy was completed. Performance of the FVA-10a was found to be excellent, fulfilling expectations. One built. FVA-10b Rheinland Design of a simplified and improved FVA-10 began in the autumn of 1936 with a new fuselage improvements to the wings and DFS airbrakes on top and bottom surfaces of the wings. The first flight was on 13 May 1937 with flight testing revealing the excellent performance which led to relative success in the 1937 International competition and the 1937 Rhön contest at the Wasserkuppe. FVA-11 Eifel In an effort to produce the 'Idealflugzeug' the FVA students designed the FVA-11 which was intended to thermal efficiently, transit between thermals at a reasonable speed with relatively low sink rate, land safely at low airspeed and require no more than three crew members for rigging and de-rigging. By using a thin wing section and high aspect ratio wing as well as flaps the FVA-11 went some way to achieve the goals set. Construction started in February 1938, but deliveries of materials were delayed so the FVA-11 was not ready for the 1938 Rhön contest. Flight testing had started and modifications planned for the aircraft but the FVA-11 was destroyed during World War II. FVA-12 The actual project designated FVA-12 is not entirely certain, but is most probably a light powered aircraft project from 1937/1938 that was not built due to pressuree to complete the FVA-13. FVA-13 Olympia-Jolle (Olympia Dinghy) In the spring of 1938, the FVA was invited to participate in the development of a glider that would be flown by all participants at the Olympic Games in 1940. A competition to select the winning design was held at Rome in 1939, with the FVA to supply two prototypes. The first prototype, 'V1', was built at Aachen and the second, 'V2', at FAG Darmstadt (Flugzeug AbteilGesellschaft Darmstadt). The competition was won by the