Mikoyan-Gurevich I-75

The I-75 was the last of three related experimental swept-wing interceptors that the Mikoyan-Gurevich bureau built in the Soviet Union in the mid and late 1950s from the I-3 airframe, after the I-3 and the I-7. It was a re-engined and radar-equipped development of the I-7, with a Lyulka AL-7F-1 afterburning turbojet replacing the cancelled Klimov VK-3, and a nose changed to take the Uragan-5 radar intercept system. It made its maiden flight on 28 April 1958 and was armed with two Kaliningrad K-8 beam-riding missiles. For all its performance, development delays ended the programme on 11 May 1959, and the Sukhoi T-43 that became the Su-9 won the production contracts.