Retaining the wing of the I-7U and designed around the 30km acquisition-range Uragan 5 radar and a pair of heavy, long-range K-8 beam-riding AAMs, the I-75 was flown for the first time on 28 April 1958.
Powered by a Lyulka AL-7F-1 turbojet offering 6240kg and 9215kg with afterburning, the I-75 flew five times before being grounded on 15 May for installation of the Uragan 5B. Testing was resumed on 25 December 1958. Although the I-75 demonstrated exceptional performance, the prototype was flown only 18 times after the resumption of the test programme, which was terminated on 11 May 1959 with the decision to adopt the competitive Sukhoi T-431 for series production (as the Su-9).
Max take-off weight: 10950 kg / 24141 lb
Empty weight: 8274 kg / 18241 lb
Wingspan: 9.98 m / 32 ft 9 in
Length: 18.27 m / 59 ft 11 in
Wing area: 31.90 sq.m / 343.37 sq ft
Max. speed: 2050 km/h / 1274 mph
Range: 1470 km / 913 miles