DVL in 1937 to test the theoretical data began to work on creating an experimental aircraft, which was to try out this new product. The creation of a specific machine instructed the organization FFG (Flugtechnische Fachgruppe der Technischen Hochschule), where the machine was given the designation B9, also own the title "Berlin. "In the register of RLM aircraft was introduced under the code of 8341 (any digit of the code indicates the type of aircraft, type of used motor, etc.).
Aircraft construction is quite sluggish. B9 layout for the tests has been prepared for the beginning of 1943 B9 Berlin was transferred to the base at Rechlin for test flights. The external appearance of the car was quite rude, but because of it and was not required purity of forms. Angular B9 fuselage was a welded iron pipes and lined with fabric. The structure of the wing was of wood, used as a cladding duralumin. With all the homeliness design B9 Berlin can withstand overloads up to 12G. Flying at it lasted right up to the end of 1944, and the results of tests used in time design and construction of Blohm und Voss BV.40 (glider fighter) and Henschel Hs.132 (jet dive bomber).
Aircraft performance characteristics:
Modification — B-9;
Length — 9.06 m;
Height — 2.32 m;
Wingspan — 9.40 m;
Wing Area — 11.9 m2;
Empty weight — 940 kg;
Normal take-off weight — 1115 kg;
Type of motor — motor 2porshnevyh Hirth HM 500;
Power — 2×105 HP;
The highest speed — 250 km / h;
Operational range — 400 km;
Service ceiling — four thousand meters;
Crew — 1 person.