The two-seat trainer BFW 1 Sperber (Sparrowhawk), was a development of the Udet U 12. The main difference was the steel tube fuselage and steel tube N-type struts. Equipped with an 125 hp Siemens & Halske Sh 12 engine, the two-seat trainer was first flown in the autumn of 1927.
Initially, the aircraft was used by the DVL (Deutschen Versuchsanstalt für Luftfahrt, German Institute for Experimental Aviation), in February 1928 it was sold to Alexander von Bismarck who used it for aerobatic flying. In October 1929 the aircraft was acquired by Prinz (Prince) Eugen von Schaumburg-Lippe, subsequent owners were W. Wildschild of Dresden, and Dr. E. Bieck of Cainsdorf. The aircraft was last seen in August 1931, its ultimate fate is unknown.
Type 2-seat sportplane
Engine 1 Siemens & Halske Sh 12
Dimensions Length 7.11 m, height 2.82 m, span 10.00 m, wing area 24.00 m2
Weights Empty 666 kg, load 234 kg, flying weight 900 kg
Performance Max. speed 137 km/h, cruising speed 110 km/h, climb to 1000 m 7.2 min., service ceiling 3600 m, range  400 km
Type Werk.Nr Registration History
a 351 D-1315 Development of the U-12 with steel-tube fuselage and N-type steeltube strutsand the undercarriage like BFW 3. Used by the DVS and later by Alexander von Bismarck on airshows. Later sold to Eugen Prinz zu Schaumburg-Lippe