The Bartel BM-4 was a Polish training and training aircraft of a mixed structure, in a biplane configuration, with a fixed landing gear. The drive was provided by a single engine Le Rhone C or Gipsy III or Walter Junior with 80 and 120 hp. The flight of the prototype took place in 1927, and in the years 1928-1932 serial production continued, ending with the production of about 75 aircraft of this type. The machine did not have a permanent armament.
In 1925, with the expiry of the license for the production of Hanriot H-28 aircraft, the Ministry of Military Welding turned to the "Samolot" plant in Poznañ with an order to create a new training aircraft for the Polish military aviation. In response to this order, the Bartel BM-2 aircraft was created, which, however, showed considerable modernization possibilities. After using this potential and introducing changes and corrections, the Bartel BM-4 machine was created. The machine was characterized by good maneuverability, good performance, and above all, a lot of flight stability, without any understeer features and flight safety. The machine also had very good visibility from the cab. Several versions of this aircraft were created in the course of serial production, two of which are very important. The first is the BM-4a, which was the first production series to use an engine as a drive Le Rhone C. In 1931, the BM-4h version went into production, powered by much more powerful Gipsy III engines or Walter Junior. Airplanes Bartel BM-4 were used primarily in piloting schools in Bydgoszcz and Dêblin, and from 1936 they were transferred to civil aviation clubs.