įollowing the S-22I, two pre-production prototypes were constructed, designated the S32-1 and the S32-2, respectively. The prototype S-22I differed little from the Su-7 except for the wing, being essentially a technology demonstrator for the variable-geometry wing. The Su-17 largely resembles its predecessor, the Su-7, with weight-saving measures added at the cost of combat survivability, an example of which is the removal of armored protection for the pilot. The Su-17 was produced until 1990, at a total of 2867 units produced. ![]() The 523rd Aviation Regiment, of the Far East Military Okrug, was the first unit to receive the Su-17. Serial production of the Su-17 started at the Yuri Gagarin Aviation Factory (now KnAAPO) in 1969. ![]() The S-32 first took off on July 1, 1969, with Yevgeny Kukushev at the controls. The design of the Su-7IG was modified further, eventually with enough difference to justify the S-32 internal designation. The aircraft was ordered into serial production in 1969 by a joint resolution of the Central Committee of the Communist Party of the Soviet Union and the Council of Ministers. Handling was also generally better than the fixed wing Su-7, with the exception that there was no longer any buffeting at high angles of attack to warn of imminent stall. Flight testing revealed that the new configuration improved both the take-off/landing characteristics and the range and endurance of the aircraft. It was later publicly demonstrated to the public at the air parade in Domodedovo in July 1967. The S-22I first took off, with Vladimir Ilyushin at the controls on 2 August 1966. The S-22I (also known as the Su-7IG, NATO designation "Fitter-B"), converted from a production Su-7BM, had fixed inner portions of the wing with movable outer segments which could be swept to 28°, 45°, or 62°. ![]() Seeking to improve low-speed and take-off/landing performance of the Su-7B fighter-bomber, in 1963 the Sukhoi OKB with input from TsAGI created a variable-sweep wing technology demonstrator. The program was to be led by Sukhoi's head designer, Nikolay Zyrin. The concept of variable-geometry wings - something gaining wider attention at that time - was adopted as well. The program would be aimed primarily at updating on-board avionics and the takeoff/landing performance characteristics. Shortly after the Su-7 fighter-bomber was put into service, the Sukhoi Design Bureau was ordered to develop a deep modernization program for the aircraft in the early 1960s. An Su-20 (left) next to an older, similar Su-7BKL.
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