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Initial delta-winged Su-15s had poor take-off and landing characteristics, and so Sukhoi investigated a new wing design with extended wingtips (increasing wing area) and boundary layer control. A simplified trainer version, the Su-15UT (NATO " Flagon-C"), with no radar or combat capability, entered service in 1970. The initial Su-15 received the NATO reporting name " Flagon-A".
#RC SUKHOI SU 9 SERIES#
Series production began the following year, and it entered service with the PVO in 1967, replacing Su-9s, Su-11s, and Yakovlev Yak-25s. The Su-15 proved to be superior in most respects other than range, and it was officially commissioned on 3 April 1965. It entered service testing 5 August 1963, but its service entry was delayed by political infighting with the Yakovlev OKB over production line capacity in Novosibirsk, which was also building the Yak-28P. It was approved for production on 5 February 1962, as the Su-15, and the prototype first flew on. These led to the T-58, which combined the twin engines with a modified version of the T-49's nose, but with side inlets further back, behind the cockpit. A variety of development aircraft evolved, including the T-49, which shared the fuselage of the Su-9 (including its single engine), but used cheek-mounted intakes to leave the nose clear for a large radome for the RP-22 Oryol-D ("Eagle") radar(NATO "Skip Spin"), and the T-5, essentially a heavily modified Su-11 with a widened rear fuselage containing two Tumansky R-11 engines. Recognizing the limitations of the earlier Su-9 and Su-11 in intercepting the then-new Boeing B-52 Stratofortress, particular in terms of radar and aircraft performance, the Sukhoi OKB quickly began the development of a heavily revised and more capable aircraft.