 From 1946 to 1947 Chyliński together with designer Bronisław Żurakowski, per agreement with Poland's Department of Civil Aviation ("Departament Lotnictwa Cywilnego"), developed the construction plans for the "Pegaz".At the same time, he was working with the Aviation Department Headquarters of the Polish Scouting and Guiding Association (Związek Harcerstwa Polskiego).The design team also included the technicians Waszkiewicz and Brewiński.