During the 1930s, discussions were held regarding a potential replacement of Poland's Fokker F.VIIs. Numerous concepts were explored by the Department of Aeronautics, the most impressive submission was deemed to have been made by Polish aeronautical engineer Jerzy Dąbrowski, who had produced the initial proposals that would lead to the PZL.37 during spring 1934 and submitted to the department in July 1934. The concept was of a very quick monoplane bomber manned by a crew of four, featuring all-metal stressed-skin construction and powered by a pair of radial engines capable of producing 800-1,200 hp. The airframe was aerodynamically clean and was to be capable of very high performance, far in advance of contemporary bombers; wind tunnel testing using scale models of the aircraft were extremely encouraged.