 The powerplant was to be the 490-hp PZL Foka ("seal") light-weight V-engine, designed by Stanisław Nowkuński of Polish Skoda Works (then PZL WS-1).Unfortunately, Nowkuński died in the Tatry mountains on 30 July 1936, and work on the engine slowed.Due to technical problems, overheating and vibration, it was decided to use a foreign engine.