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The Bartel BM-4a,B M-4h and BM-5d trainers was a Polish biplane aircrafts. BM-4a was the first plane of Polish design put into production. Used from 1929 to 1939 by the Polish Air Force, manufactured in the Wielkopolska Aircraft Factory WWS "Samolot" in Poznan. All Bartel training aircrafts had very good handling, high stability and the total spin resistance, provide high security in primary training. Aircrafts constructed from wood, canvas and aluminum characterized by interchangeability of the upper and lower wings and the standardization of parts and materials.
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