 In addition, the institute principal Władysław Fiszdon was the only person in a team, who had ever seen a helicopter (Sikorsky R-4 in England).Despite severe material shortages, work on experimental design started in 1948, and the main designer became Bronisław Żurakowski (brother of test pilot Janusz Żurakowski), who designed a rotor and control system.It used simpler Hiller rotor type, with two auxiliary blades.