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Sukhoi Su-17 / Su-20 / Su-22 (Fitter) Ground Attack / Strike Fighter (1970)

Authored By Captain Jack | Last Updated: 11/3/2014

The Soviet Sukhoi Su-17 Fitter - and its export derivatives, the Su-20 and Su-22 - were swing-wing developments of the original Su-7 Fitter fixed-wing design.

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The Mach 2-capable Sukhoi Su-17 "Fitter" was a further development of the successful Su-7 "Fitter-A" fighter/fighter-bomber family line detailed elsewhere on this site. The aircraft incorporated a partial variable geometry wing ("swing wing") system and improved upon the former's take-off and landing attributes as well as performance at the low-level as required of it during ground attack runs. The swing-wing element added to the aircraft's stability at low-speeds and altitudes while improving overall range and ordnance loads by featuring large-area fixed wing "gloves". Beyond its new wing arrangement, the Su-17 also differed from its Su-7 origins in that it featured a newly-designed canopy and nose assembly as well as an identifiable raised fuselage spine, giving the new aircraft a more stout appearance than the pencil-thin Fitter-A. The type served the Soviet Union well and was heavily exported to Warsaw Pact nations and trusted Third World allies alike. The Su-17 was developed into the export Su-20 and Su-22 Fitter models of varying avionics, engines and weapons. In all, some 2,867 Su-17/Su-20/Su-22 Fitters were produced with almost half of these made available to Soviet export customers. Over a dozen nations took delivery of the type, making it a staple fighter-bomber throughout the Cold War. Some air forces continue to fly the aircraft - nearly forty years after it was introduced.

Development - Fitter-B

The Su-7 (NATO codename of "Fitter-A") was a capable aircraft in its own right. However, there were glaring deficiencies in its operational range - no thanks to a thirsty powerplant - and ordnance-carrying capabilities. Sukhoi and Soviet authorities sought other improvements that would make the Fitter series a much more capable and versatile battlefield component. As such, a Su-7BM production model served as the demonstrator for the testing of a new swing-wing variable geometry system development. The new wing would essentially be made up of two parts - a fixed wing root/wing glove and the positional swing-wing portion making up half of the wing (at about mid-wing span). The new prototype became the Su-7IG ("IG" for "Izmenyaemaya Geometriya", also internal designation of "S-22I"). First flight was achieved on August 2nd, 1966. The working prototype/technology demonstrator showed enough promise during this testing phase, improving on both field performance and range of the Su-7, that it was selected for production.

A two-seat Su-7U long-fuselage trainer was then revised. The rear instructor's cockpit would make way for additional avionics and fuel while housing the new wing component. The swing-wing configuration was devised as a way to increase the Su-7's inherent range while at the same time allowing the aircraft to carry more weaponry along its fixed wing portion without the need to implement heavy and complex swiveling weapon stations to maintain aerodynamic integrity in full sweep. A limited production run appeared under the base "Su-17" designation, these being fitted with the Lyulka AL-7F-1 turbojet powerplant of 22,046lbs thrust. Production of this early Fitter-B would run from 1969 to 1973.

The Su-17K became the export version of this base Su-17, though this was only received by the Egyptian Air Force. NATO assigned the new aircraft design the codename of "Fitter-B", sequentially relating this new design with that of the original Su-7 it originated from.

The Rest of the Su-17 Fitter Variants - Beginning with Fitter-C

The Su-17M (S-32M) became the first quantitative production version of note and was known to NATO as "Fitter-C". The aircraft was fitted with an afterburning Lyulka AL-21F-3 engine of 24,800lbs output and was given an onboard SRD-5M range-finding radar (same as the one found on the Su-7BMK production models). A new navigation and attack system was installed for her intended ground attack role. The fuselage was also given a pair of forward-mounted pitot pressure measurement tubes. An Angle-of-Attack (AoA) vane was affixed as was a rear brake parachute, the latter promoting shorter landing runs. First flight was achieved on December 28th, 1971. In addition to her primary battlefield roles, some Su-17s were developed into a limited-production - though still capable - reconnaissance variant under the Su-17R designation featuring reconnaissance pods with applicable equipment. Production of the improved Fitter-C began in 1972 with official introduction occurring in 1973. Production ceased in 1975.

The export version of this ground attack model became the Su-20. The prototype Su-20 first flew on December 15th, 1972. Egypt, Poland and Syria were the primary export customers of this new aircraft. The Su-20R was the export reconnaissance equivalent of the base Su-20 line.

Fitter-D

The Su-17M2 was the next definitive development and was assigned the NATO codename of "Fitter-D". She was essentially an improved production form of the former types and was known internally at Sukhoi as S-32M2. The nose assembly was extended by 15 inches and revised to incorporate more of a downward slope to improve the pilot's "out-of-the-cockpit" forward visibility - a plus in the low-level strike role. This new Fitter also deleted the ranging radar but incorporated the Fon-1400 laser rangefinder as well as additional combat-related avionics. A DISS-7 Doppler navigation radar was installed into a fairing under the nose and first flight of the aircraft was achieved on December 20th, 1973. Production began in 1974, lasting until 1977, and the Su-17M2 officially entered Soviet service in 1975. The Su-17M2 featured a fixed shock cone.

The Su-17M2D was another Fitter-D development but fitted with a Tumansky R-29BS-300 series engine of 25,335lbf with afterburning in a revised rear fuselage (this being a defining feature of the variant) and shorter overall fuselage. The engine offered little in the way of improved performance and limited range so was therefore only offered in forthcoming export deliveries. First flight was achieved on January 31st, 1975 and production lasted from 1977 to 1978.

Fitter-E - the Trainer

The Su-17UM was the two-seat trainer form developed from the S-52U prototype and given the NATO codename of "Fitter-E". Production began in 1976, with the aircraft entering service that same year. Production lasted until 1978. This new aircraft featured a deeper revised airframe to make room for the addition of the second cockpit for the instructor. This also resulted in the deletion of some internal fuel space thus limiting the aircraft's range. The original avionics of the production model were maintained while the portside cannon was omitted. The vertical tail fin was enlarged to counteract the effects of longitudinal instability (when in a high AoA). First flight was achieved on August 15th, 1975.

The two-seat Su-17UM went under the export designation of Su-22U and fitted a Tumansky R-29 series powerplant.

Fitter-F

The Su-17M2D export model became the Su-22 which fell under the internal Sukhoi designation of S-32M2K. The Su-22 was afforded the same K-36D ejection seat system as found on the modern-day MiG-29 "Fulcrum" and Sukhoi Su-27 "Flanker" jet aircraft series and was powered by a Tumansky R-29 engine. The Su-22 also featured a fixed shock cone, laser rangefinder and Doppler radar.

Fitter-G

The Lyulka-powered Su-17UM3 (S-52UM3, NATO codename of "Fitter-G") was a revised conversion trainer with the deeper fuselage and revised vertical tail fin. It fitted the avionics suite of the Su-17M3 and achieved first flight on September 21st, 1978. Production lasted from 1978 until 1982.

The export form was offered as the Su-22UM3 and the Su-22UM-3K, each differing by their use of the Tumansky R-29 and Lyulkin AL-21 series engines respectively.

Fitter-H

The Su-17UM two-seat trainer airframe was also used in the development of the S-52, becoming the Su-17M3 ("Fitter-H"). The instructor's cockpit position was naturally removed and made way for additional avionics and fuel stores, the latter benefitting range. The external Doppler radar fairing was moved into an internal position and provision for AA-2 "Atoll and AA-8 "Aphid" along two hardpoints under the wing gloves were added. First flight was achieved on June 30th, 1976. Production lasted from 1976 until 1981. The Su-17M3 (and its related export derivatives) model became the most quantitative Su-17 Fitter development of the series, numbering nearly 1,000 production examples in whole.


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Specifications for the
Sukhoi Su-17 / Su-20 / Su-22 (Fitter)
Ground Attack / Strike Fighter


Focus Model: Sukhoi Su-17M4 (Fitter-K)
Country of Origin: Soviet Union
Manufacturer: Sukhoi - Soviet Union / Russia
Initial Year of Service: 1970
Production: 2,867


Crew: 1


Length: 62.40 ft (19.02 m)
Width: 44.88 ft (13.68 m)
Height: 16.80ft (5.12 m)
Weight (Empty): 26,808 lb (12,160 kg)
Weight (MTOW): 42,990 lb (19,500 kg)


Powerplant: 1 x Lyulka AL-21F-3 turbojet engine developing 24,802 lb of thrust.


Maximum Speed: 718 mph (1,155kmh; 624 kts)
Maximum Range: 889 miles (1,430km)
Service Ceiling: 49,869 ft (15,200 m; 9.4 miles)
Rate-of-Climb: 45,275 feet per minute (13,800 m/min)


Hardpoints: 12
Armament Suite:
STANDARD:
2 x 30mm Nudelman-Rikhter NR-30 cannons in leading edge wing roots.

OPTIONAL:
10 to 12 hardpoints for up to 9,000lbs of mixed ordnance including conventional drop bombs, napalm, drag chute bombs, runway-defeating bombs, TV/Laser-guided bombs, rocket pods, gun pods, air-to-surface missiles and air-to-air missiles.


Variants:
Su-7 (Fitter-A) - Base Fixed-Wing Interceptor Model on which the Su-17 is based on.


Su-7IG/ S-22I (Fitter-B) - Based on the Su-7BM production model; used in testing the swing-wing component.

Su-17 (Fitter-B) - Base production model; limited production; extended fuselage based on the Su-7U two-seat trainer; revised airframe with dorsal fuselage spine; increased internal fuel capacity; fitted with Lyulka AL-7F-1 engine; production from 1969 to 1973.

Su-17K (Fitter-B) - Egyptian Export Model Designation of the base Su-17.

Su-17M (Fitter-C) - Initial Production Model of note; fitted with Lyulka AL-21F-3 engine; revised nav-attack system; implementation of dual pitot vanes as well as AoA vane; brake parachute; positional shock cone; production from 1972 to 1975.

Su-20 (Fitter-C) - Export Designation of Su-17M production model.

Su-17M-28 - Developmental Airframe for testing AS-9 "Kyle" anti-radar missile.

Su-17MKG - Developmental Airframe for testing AS-10 "Karen" and AS-14 "Kedge" air-to-surface missiles.

Su-17R (Fitter-C) - Limited Production Reconnaissance Variant of the Su-17M production model.

Su-20R (Fitter-C) - Export Designation of Su-17R reconnaissance model.

Su-17M2 (Fitter-D) - Redesigned and extended nose assembly; undernose Doppler radar; laser rangefinder; improved and expanded avionics; production from 1974 to 1977.

Su-17M2D (Fitter-D) - Fitted with Tumansky R-29BS-300 series engine of 25,335lbf; revised rear fuselage; production from 1977 to 1978.

Su-22 / S-32M2K (Fitter-F) - Export Designation of Su-17M2D production model.

Su-17UM / S-52U (Fitter-E) - Two -Seat Conversion Trainer; based on the Su-17M2 production model; revised deeper fuselage; deletion of internal fuel capacity; portside cannon removed; enlarged vertical tail fin for improved longitudinal control at high AoA; production from 1976 to 1978.

Su-22U - Export Model Designation of Su-17UM two-seat trainer; fitted with Tumansky R-29 series engine.

Su-17M3 / S-52 (Fitter-H) - Additional fuel and avionics equipment; based on two-seat trainer sans the second cockpit; improved range; internal Doppler radar system; launch rails installed for AA-2 and AA-8 missiles; production from 1976 to 1981.

Su-22M / S-52K (Fitter-J) - Export Model Designation of the Su-17M3; fitted with Tumansky R-29 series engine; downgraded avionics.

Su-22M3 / S-52MK (Fitter-J) - Export Model Designation of Su-17M3 with Soviet Su-17M3 avionics in place.

Su-17UM3 / S-52UM3 (Fitter-G) - Improved Two-Seat Trainer; Su-17M3 avionics; production from 1978 to 1982.

Su-22UM3 (Fitter-G) - Export Model Designation of Su-17UM3 trainer; fitted with Tumansky R-29 engine.

Su-22UM3K (Fitter-G) - Export Model Designation of Su-17UM3 trainer; fitted with Lyulka AL-21 engine.

Su-17M4 - Upgraded avionics suite; improved laser rangefinder; Sirena radar-warning receiver; fuselage and dorsal air inlets for improved engine cooling; fixed shock cone; TV-guided ordnance compatibility; production from 1981 to 1988.

Su-22M4 / S-54K - Export Model Designation of Su-17M4 production model; production from 1983 to 1990.

Su-22M5 - Modernized Fitters with French/Russian-based equipment and systems; HOTAS; glass cockpit; improved avionics suite; Phazotron/Thomson-CSF radar system; sans laser rangefinder.


Operators:
Armenia; Afghanistan; Algeria; Angola; Azerbaijan; Belarus; Bulgaria; Czech Republic; Czechoslovakia; East Germany; Egypt; Germany; Hungary; Iraq; Iran; Libya; North Korea; Peru; Poland; Russia; Slovakia; Soviet Union; Syria; Turkmenistan; Ukraine; Uzbekistan; Vietnam; Yemen