The Sukhoi Su-11 (

NATO reporting name NATO reporting names are code names for military equipment from Russia, China, and historically, the Eastern Bloc (Soviet Union and other nations of the Warsaw Pact). They provide unambiguous and easily understood English words in a uniform man ...

: Fishpot-C) was an

interceptor aircraft An interceptor aircraft, or simply interceptor, is a type of fighter aircraft designed specifically for the defensive interception role against an attacking enemy aircraft, particularly bombers and reconnaissance aircraft. Aircraft that are ...

used by the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...

in the 1960s.

Design and development

The Su-11 was an upgraded version of the

Sukhoi Su-9 The Sukhoi Su-9 (NATO reporting name: Fishpot) was a single-engine, all-weather, missile-armed interceptor aircraft developed by the Soviet Union. Development The Su-9 emerged from aerodynamic studies by TsAGI, the Soviet aerodynamic center, ...

('Fishpot') interceptor, which had been developed in parallel with the OKB's

swept wing A swept wing is a wing that angles either backward or occasionally forward from its root rather than in a straight sideways direction. Swept wings have been flown since the pioneer days of aviation. Wing sweep at high speeds was first investiga ...

Su-7 The Sukhoi Su-7 ( NATO designation name: Fitter-A) is a swept wing, supersonic fighter aircraft developed by the Soviet Union in 1955. Originally, it was designed as a tactical, low-level dogfighter, but was not successful in this role. On the ...

fighter bomber A fighter-bomber is a fighter aircraft that has been modified, or used primarily, as a light bomber or attack aircraft. It differs from bomber and attack aircraft primarily in its origins, as a fighter that has been adapted into other roles, wh ...

. Recognizing the Su-9's fundamental limitations, Sukhoi began work on the Su-11, which first flew in

1961 Events January * January 3 ** United States President Dwight D. Eisenhower announces that the United States has severed diplomatic and consular relations with Cuba (Cuba–United States relations are restored in 2015). ** Aero Flight 311 (K ...

as the T-47 prototype. The Su-11 shared the Su-9's

delta wing A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (Δ). Although long studied, it did not find significant applications until the Jet Age, when it proved suita ...

, swept

tail The tail is the section at the rear end of certain kinds of animals’ bodies; in general, the term refers to a distinct, flexible appendage to the torso. It is the part of the body that corresponds roughly to the sacrum and coccyx in mammal ...

planes and cigar-shaped fuselage, as well as the circular nose intake, but had a longer nose to accommodate the more powerful 'Oryol' (''Eagle'';

'Skip Spin') radar set. A more powerful Lyulka AL-7F-1

turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, a ...

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 Semi-active radar homing (SARH) is a common type of missile guidance system, perhaps the most common type for longer-range air-to-air and surface-to-air missile systems. The name refers to the fact that the missile itself is only a passive de ...

and one R-98MT

infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of Light, visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from ...

guided. Like many interceptors of the period, it had no cannon. Production of the definitive Su-11-8M began in

1962 Events January * January 1 – Western Samoa becomes independent from New Zealand. * January 3 – Pope John XXIII excommunicates Fidel Castro for preaching communism. * January 8 – Harmelen train disaster: 93 die in the wor ...

, ended in

1965 Events January–February * January 14 – The Prime Minister of Northern Ireland and the Taoiseach of the Republic of Ireland meet for the first time in 43 years. * January 20 ** Lyndon B. Johnson is sworn in for a full term ...

, 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, but the second seat reduced its already marginal fuel capacity and was not intended for combat use.

Operational history

Development problems and accidents delayed squadron introduction with the

Soviet Air Force The Soviet Air Forces ( rus, Военно-воздушные силы, r=Voyenno-vozdushnyye sily, VVS; literally "Military Air Forces") were one of the air forces of the Soviet Union. The other was the Soviet Air Defence Forces. The Air Forces ...

(VVS)/

Soviet Air Defence Forces The Soviet Air Defence Forces (russian: войска ПВО, ''voyska protivovozdushnoy oborony'', ''voyska PVO'', ''V-PVO'', lit. ''Anti-Air Defence Troops''; and formerly ''protivovozdushnaya oborona strany'', ''PVO strany'', lit. ''Anti-Air De ...

(PVO) until

1964 Events January * January 1 – The Federation of Rhodesia and Nyasaland is dissolved. * January 5 - In the first meeting between leaders of the Roman Catholic and Orthodox churches since the fifteenth century, Pope Paul VI and Patriarc ...

and only small number of aircraft were delivered. Even with the superior radar, the Su-11 remained heavily dependent on

ground control interception Ground-controlled interception (GCI) is an air defence tactic whereby one or more radar stations or other observational stations are linked to a command communications centre which guides interceptor aircraft to an airborne target. This tactic was p ...

(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 The Sukhoi Su-15 (NATO reporting name: Flagon) is a twinjet supersonic interceptor aircraft developed by the Soviet Union. It entered service in 1965 and remained one of the front-line designs into the 1990s. The Su-15 was designed to replace t ...

('Flagon'). Nevertheless, a few examples remained operational until the early 1980s. The last Su-11s left front-line service around

1983 The year 1983 saw both the official beginning of the Internet and the first mobile cellular telephone call. Events January * January 1 – The migration of the ARPANET to TCP/IP is officially completed (this is considered to be the beginning ...

Operators

; *

Specifications (Su-11)

References

External links