Aviotehas PN-3
The PN-3 "Isamaa Päästja" - ("Savior of the Fatherland" in Estonian), was an Estonian fighter and surveillance aircraft. Design. Designed by V. Post & R. Neudorf of the Estonian Aero Club ("Eesti Aeroklubi"), the PN-3 was produced by Aviotehas in 1939, featuring a Rolls-Royce Kestrel XI engine that allowed a top speed of . The series was planned with retractable landing gear, but the prototype was built with fixed landing gear for economy and to speed up development. The start of World War II and Soviet occupation of Estonia interrupted the PN-3 program, and it never reached mass production. The  armament of the PN-3 was to have consisted of two machine guns. Service history. Just one prototype was finished and delivered to the Estonian Air Force, later being used as a trainer. After Estonia was occupied by the USSR in 1940, the single prototype was used for target practice.