Sukhoi Su-11

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Su-11 VVS museum.jpg
Role Interceptor aircraft
National origin Soviet Union
Manufacturer Sukhoi
First flight 25 December 1958
Introduction 1964
Retired 1983
Primary user Soviet Air Forces
Produced 1962–1965
Number built 108
Developed from Sukhoi Su-9

The Sukhoi Su-11 (NATO reporting name: Fishpot-C) was an interceptor aircraft used by the Soviet Union in the 1960s.

Design and development[edit]

The Su-11 was an upgraded version of the Sukhoi Su-9 ('Fishpot') interceptor, which had been developed in parallel with the OKB's swept wing Su-7 fighter bomber. Recognizing the Su-9's fundamental limitations, Sukhoi began work on the Su-11, which first flew in 1961 as the T-47 prototype.

The Su-11 shared the Su-9's delta wing, swept tailplanes and cigar-shaped fuselage, as well as the circular nose intake, but had a longer nose to accommodate the more powerful 'Oryol' (Eagle; NATO reporting name 'Skip Spin') radar set. A more powerful Lyulka AL-7F-1 turbojet was installed, providing 9.8 kN (2,210 lbf) more afterburning thrust for improved climb rate and high-altitude performance (and to compensate for increased weight). The Su-11 can be distinguished from the Su-9 by the external fuel pipes atop the fuselage, aft of the cockpit.

The Su-9's beam-riding K-5 missiles were replaced by a pair of R-98 (AA-3 'Anab') weapons, usually one R-98MR semi-active radar homing and one R-98MT infrared guided. Like many interceptors of the period, it had no cannon.

Production of the definitive Su-11-8M began in 1962, ended in 1965, after about 108 aircraft had been delivered, although it is believed that at least some Su-9s were upgraded to Su-11 form.

A conversion trainer version, the Su-11U 'Maiden,' was also developed. Similar to the Su-9U, it had full armament and radar systems for training purposes. Because the second seat further reduced its already marginal fuel capacity, it was not really intended for combat use.

Operational history[edit]

Development problems and accidents delayed squadron introduction with the Soviet Air Force (VVS)/ Soviet Air Defence Forces (PVO) until 1964 and only small number of aircraft were delivered.

Even with the superior radar, the Su-11 remained heavily dependent on ground control interception (GCI) to vector its pilot onto targets. It had no capability against low-flying aircraft either, and Sukhoi OKB considered the Su-11 to be a misfire, much inferior to the far more formidable Su-15 ('Flagon'). Nevertheless a few examples remained operational until the early 1980s. The last Su-11s left front-line service around 1983.


 Soviet Union

Specifications (Su-11-8M)[edit]

General characteristics

  • Crew: 1
  • Length: 18.29 m (60 ft)
  • Wingspan: 8.43 m (27 ft 8 in)
  • Height: 4.88 m (16 ft)
  • Wing area: 34 m² (366 ft²)
  • Empty weight: 9,000 kg (20,000 lb)
  • Loaded weight: 13,600 kg (30,000 lb)
  • Powerplant: 1 × Lyulka AL-7F-1 turbojet, 96 kN (21,164 lbf)



See also[edit]

Related development
Aircraft of comparable role, configuration and era

External links[edit]