Formerly known as GIL-4 and built in the 50's as a 4-seat light helicopter. Due to a long program of testing and issues, the first flight didn't take place until February 10, 1959. It completed 17 flights for a total flight time of 3h40. The Zuk was still in development when the project was cancelled in favor of the license production of the Mil Mi-1. The prototype was damged during landing on August 31, 1959 and that was the end of the aircraft. 2 other prototypes were not completed.