S-2 Tracker

S-2 Tracker

infobox Aircraft
name = S-2 Tracker
type = ASW aircraft
manufacturer = Grumman

caption = An S-2E ready for launching from the USS|Bennington|CVS-20
designer =
first flight = 1952-12-04
introduced = February, 1954
produced =
retired = 1976, USN
status = active with Argentine Navy
primary user = US Navy
more users = Canadian Navy Australian Navy Argentine Navy
number built = 1,284
unit cost =
variants with their own articles = C-1 Trader E-1 Tracer

The Grumman S-2 Tracker (previously S2F) was the first purpose-built, single airframe anti-submarine warfare (ASW) aircraft to enter service with the US Navy.

Its predecessor, the AF-2 Guardian was the first purpose-built aircraft system for ASW, using two airframes, one with the detection gear, and the other with the weapons.

Design and development

Grumman's design (model G-89) was for a large high-wing monoplane with twin Wright Cyclone radial engines.

Both the two prototypes XS2F-1 and 15 production aircraft, S2F-1 were ordered at the same time, on 30 June 1950. First flight was 4 December 1952, and production aircraft entered service, with VS-26, in February 1954.

Follow-on versions included the WF Tracer and TF Trader, which became the E-1 Tracer and C-1 Trader in the tri-service designation standardization of 1962. The S-2 carried the nickname "Stoof" (S-two-F) throughout its military career; and the E-1 Tracer variant with the large overhead radome was called the "stoof with a roof.".O'Rourke, G.G., CAPT USN. "Of Hosenoses, Stoofs, and Lefthanded Spads". "United States Naval Institute Proceedings", July 1968.]

Grumman produced 1,185 Trackers. Another 99 aircraft carrying the CS2F designation were manufactured in Canada under license by de Havilland Canada. U.S.-built versions of the Tracker were sold to various nations, including Australia, Japan and Taiwan.

Operational history

The Tracker was eventually superseded for U.S. military use by the S-3 Viking — the last USN Tracker squadron (VS-37 with S-2G models) was disestablished in 1976, but a number live on as firefighting aircraft. Trackers continued to provide excellent service in Naval forces of other countries for years after the U.S. discontinued them. For example, the Royal Australian Navy continued to use Trackers as front line ASW assets until the mid 1980s.

The Argentine Navy received its first S-2A models on the 1960s and later used the improved S-2E from the aircraft carrier ARA "25 de Mayo". In the 1990s, they were upgraded with local software and by Israel with turboprop engines nicknamed S-2T Turbo Trackers. With the retirement of its unique aircraft carrier, the Argentines currently use them from the NAe "São Paulo" of the Brazilian Navy.

In the late 1980s and early 90s Conair Aviation of Abbotsford, British Columbia, Canada took possession of retired U.S. and Canadian Trackers and converted them into Firecats, with a retardant tank replacing the torpedo bay. The Firecats were made in two variants, a piston engine Firecat and a turboprop-powered Turbo Firecat.


;XS2F-1:Two prototype anti-submarine warfare aircraft powered by 1,450-hp R-1820-76WA engines.;YS2F-1:Designation of the first 15 production aircraft used for development, redesignated YS-2A in 1962.;S2F-1:Initial production variant with two 1,525-hp R-1820-82WA engines, re-designated S-2A in 1962, 740 built.;S2F-1T:Trainer conversion of S2F-1, redesignated TS-2A in 1962.;S2F-1U:Utility conversion of S2F-1, redesignated US-2A in 1962.;S2F-1S:S2F-1 conversion with Julie/Jezebel detection equipment, redesignated S-2B in 1962. Survivors converted to US-2B after removal of ASW gear. ;S2F-1S1:S2F-1S fitted with updated Julie/Jezebel equipment, redesignated S-2F in 1962.;S2F-2:As S2F-1 with asymmetrical (port-side) extension of bomb bay, slightly enlarged tail surfaces, 77 built, most redesignated S-2C in 1962.;S2F-2P:Photo reconnaissance conversion of S2F-2, redesignated RS-2C in 1962.;S2F-2U:Utility conversion of S2F-2/S-2C, redesignated US-2C in 1962. Some were used as target tugs.;S2F-3:Enlarged forward fuselage, enlarged tail surfaces, additional fuel capacity, and enlarged engine nacelles bays for 32 sonobouoys, redesignated S-2D in 1962, 100 built.;S2F-3S:As S2F-3 but with Julie/Jezebel equipment, redesignated S-2E in 1962, 252 built.;YS-2A:YS2F-1 redesignated in 1962.;S-2A:S2F-1 redesignated in 1962.;TS-2A:S2F-1T training version redesignated in 1962 and 207 conversion from S-2A.;US-2A:S-2A converted as light transports/target tugs, 51 conversions.;S-2B:S2F-1S redesignated in 1962.;US-2B:Utility and target tug conversions of S-2A and S-2B, Most S-2Bs were converted and 66 S-2As.;S-2C:S2F-2 redesignated in 1962.;RS-2C:S2F-2P photo-reconnaissance version redesignated in 1962.;US-2C:S2F-2U utility version redesignated in 1962.;S-2D:S2F-3 redesignated in 1962.;YAS-2D/AS-2D:Proposed self-contained night attack aircraft to be developed under Operation Shed Light; none produced.;ES-2D:Electronic trainer conversion of the S-2D.;US-2S:Utility conversion of the S-2D.;S-2E:S2F-3S redesignated in 1962.;S-2F:S2F-1S1 redesignated in 1962.;US-2F:Transport conversion of S-2F.;S-2G:S-2E conversions with updated electronics.; CS2F-1:Initial production run of anti-submarine warfare aircraft for Canada based on S2F-1. 42 built by De Havilland Canada. cite web|url = http://www.shearwateraviationmuseum.ns.ca/aircraft/tracker.htm|title = Grumman Tracker|accessdate = 2008-03-27|last = Shearwater Aviation Museum |authorlink = |year = undated] ; CS2F-2:Improved version of CS2F-1 with Litton Industries tactical navigation equipment. 57 built by De Havilland Canada.; CS2F-3:New designation given to 43 CS2F-2 aircraft upgraded with additional electronics.; CP-121:New designation given to all CS2F-1, -2, and -3 aircraft following unification of Canadian military in 1968. ; S-2T Turbo Tracker:Civil conversion;S-2AT:Civil firefighter conversion.;S-2ET:Civil conversion.;Marsh S-2F3AT Turbo Tracker:Turboprop conversion, powered by two Garrett TPE331 engines; [ [http://registry.faa.gov/aircraftinquiry/NNumSQL.asp?NNumbertxt=436DF FAA registry entry showing manufacturer, model and engine type] ] 22 operated by the CDF;Conair Firecat or Turbo Firecat:Civil conversion as a single-seat firefighting aircraft.
*For the crew trainer/transport version based on the Tracker refer to C-1 Trader
*For the Airborne Early Warning version based on the Trader refer to E-1 Tracer


Military Operators

*Argentine Navy antisubmarine naval squadron (Spanish: "Escuadrilla Aeronaval Antisubmarina") operated S-2A and S-2E since the 1960s. They were embarked on the "ARA 25 de Mayo" aircraft carrier and used in the COD, Maritime Patrol and ASW roles. On 26 August 1985, former president Raul Alfonsin landed on the aircraft carrier in one of these planes. In the 1990s, six remaining airframes where refurbished by Israel Aerospace Industries as S-2T Turbo Trackers and since 2001 they are annually deployed on board Brazilian Navy NAe "São Paulo" during joint exercises ARAEX and TEMPEREX. [ [http://www.histarmar.com.ar/Armada%20Argentina/AviacionNaval/AS-Tracker.htm Pictorial and historical data] es icon]

*Royal Australian Navy operated two Squadrons of S-2E and S-2G variants from 1967 until 1984. VS-816 front line squadron, although based at Nowra, frequently embarked the "Majestic" class aircraft carrier HMAS "Melbourne", as part of the 21st Carrier Air Group whenever that ship was deployed. VC-851 training squadron was based at NAS Nowra, HMAS Albatross.:During about twenty years of operation of the Tracker, the RAN lost only one S-2 during aircraft operations due to an accident at sea. However, in the mid 1970s a deliberately lit fire in a hangar at Nowra destroyed or badly damaged a large proportion of the RAN's complement of Trackers. These were subsequently replaced with ex-USN aircraft. The replacement aircraft were all S-2Gs, including the original aircraft modified by the USN to that status. This saw the introduction of AQA-7 acoustic gear into RAN service and all RAN operational Trackers were subsequently modified to this standard. The AQA-7 significantly enhanced the RAN's ASW capability.

*Brazilian Air Force used Trackers on behalf of the navy until their retirement. They operated from the aircraft carrier NAeL "Minas Gerais".

*In 1954, de Havilland Canada entered into a contract to build Trackers under license to replace the outmoded TBM-3E Avengers being used by the Royal Canadian Navy. A total of 99 Canadian-built Trackers would enter service starting in 1956. From 1957 onwards, these aircraft operated from the newly-deployed aircraft carrier HMCS "Bonaventure" and various shore bases. In 1960, 17 active-duty CS2F-1 aircraft were transferred to the Royal Netherlands Navy. In 1964, a pair of CS2F-1 aircraft were stripped of armament and ASW electronics, converted to transports, and subsequently used for carrier onboard delivery. The CS2F-1, -2, and -3 were redesignated as the CP-121 Mk.1, Mk.2, and Mk.3 respectively following the unification of Canadian forces in 1968.:After "Bonaventure" was decommissioned in 1970, all remaining Canadian Trackers were transferred to shore bases. This limited their usefulness for ASW patrols, and between 1974 and 1981, all but 20 were gradually placed in storage and the remainder were stripped of their ASW gear. The remaining active-duty Trackers served until 1990 doing fisheries protection and maritime patrol duties. A handful of Trackers were kept in flying condition until the late 1990s but were no longer used for active service. cite web|url = http://www.aviation.technomuses.ca/pdf/Grumman_CS2F-CP121_Tracker.pdf| title=Grumman CS2F / CP-121 Tracker | work=Canada Aviation Museum Aircraft |accessdate = 2008-03-28|first = Colonel D.H.|last = Tate|authorlink = |year = undated|format=PDF] :A single Grumman-built S2F-1, serial number X-500, was sold to the RCN before Canadian production commenced. It was initially used for quality control purposes during Canadian production, and was later given a new RCN serial number, upgraded to CS2F-1 standards, and used to train RCN ground and maintenance personnel. This aircraft was placed in storage in 1972 and was undergoing restoration in March 2008.

*Italian Air Force;JPN
*Japan Maritime Self-Defense Force;KOR
*Republic of Korea Navy

*Royal Netherlands Navy received in 1960 17 CS2F-1 aircraft formerly used by the Royal Canadian Navy. These aircraft were operated from land bases as well as from the light carrier Karel Doorman until a fire in 1968 took that ship out of Dutch service.

*Peruvian Navy operated with S-2E and S-2G from 1975 until 1989, they were assigned to Naval Aviation Squadron N°12 (Escuadron Aeronaval N°12). A total of 12 S-2E were bought from the US Navy in 1975 and 4 S-2G in 1983.;ROC-TW
*Republic of China Navy currently operate 2 S-2T (upgrade from S-2E and S-2G, 22 S-2T have been retired with the remaining to be replaced by 12 P-3C Orions).;THA
*Air Division of the Royal Thai Navy;TUR
*Turkish Navy Air Force;USA
*United States Navy operated their Trackers between 1954 and 1976.
*United States Marine Corps operated some Trackers.;URY
*Uruguayan Navy received the first three S-2A Trackers on 10 April 1965 to the Capitan Curbelo Navy Base. On 15 September 1982 one S-2G arrived. On 2 February 1983 another two S-2G arrived. By September 2004 the remaining Uruguayan Trackers were not in flight condition.;VEN
*Venezuelan Navy

Civil Operators

Many retired "Trackers" were sold to private owners for fire-fighting duties. Some were rebuilt and re-engined with turboprop engines.

*Conair Group Inc. received TS-2A/Conair Firecat (G-89).
*Saskatchewan Environment received TS-2A/Conair Firecat (G-89).

*Sécurité Civile received US-2A/Conair Turbo Firecat (G-89).

*KLM - Royal Dutch Airlines operated S-2 Tracker (G-89/G-121/S2F) - ex-Dutch Navy Tracker was used by KLM to train their mechanics.

*California Department of Forestry & Fire Protection received S-2F3AT Turbo Tracker (G-121)
*Hemet Valley Flying Service received TS-2A(FF) Tracker (G-89)
*Marsh Aviation received S-2A(FF) Tracker (G-89)
*Sis-Q Flying Service received TS-2A Tracker (G-89/S2F-1T)
*Aero Union, in addition to being an operator, Aero Union devekioed the prototype S-2 tankers for the State of California in 1973. [ [http://p2vneptune.com/f01.shtml P2VNeptune.org] ]

pecifications (S-2F)

aircraft specifications
plane or copter?=plane
jet or prop?=prop
ref=Canada Aviation Museum|crew=four (two pilots, two detection systems operators)
length main=43 ft 6 in
length alt=13.26 m
span main=72 ft 7 in
span alt=22.12 m
height main=17 ft 6 in
height alt=5.33 m
area main=485 ft²
area alt=45.06 m²
empty weight main=18,315 lb
empty weight alt=8,310 kg
loaded weight main=23,435 lb
loaded weight alt=10,630 kg
useful load main=
useful load alt=
max takeoff weight main=26,147 lb
max takeoff weight alt=11,860 kg
more general=
engine (prop)=Wright R-1820-82WA
type of prop=radial engines
number of props=2
power main=1,525 hp
power alt= kW
power original=
power more=
max speed main=280 mph
max speed alt=450 km/h
max speed more=at sea level
cruise speed main=150 mph
cruise speed alt=240 km/h
cruise speed more=
range main=1,350 mi
range alt=2,170 km
range more=or 9 hours endurance
ceiling main=22,000 ft
ceiling alt=6,700 m
climb rate main=
climb rate alt=
loading main=
loading alt=
power/mass main=
power/mass alt=
more performance=
* 2× homing torpedoes (Mk. 41, Mk. 43, or Mk. 34), depth charges (Mk. 54), or mines in the bomb bay
* 6× underwing hardpoints for torpedoes, depth charges, or rockets

ee also

* C-1 Trader
* E-1 Tracer
similar aircraft=
* AF Guardian
* Fairey Gannet
* Breguet Alizé
* S-3 Viking
see also=
* Carrier onboard delivery




* Hotson, Fred W. "The de Havilland Canada Story". Toronto: CANAV Books, 1983. ISBN 0-07-549483-3.
* Winchester, Jim (ed.). "Grumman S-2E/F/G/UP Tracker." "Modern Military Aircraft" (Aviation Factfile). Rochester, Kent, UK: Grange Books plc, 2004. ISBN 1-84013-640-5.

External links

* [http://www.s2tracker.com The S-2 Tracker Museum]
* [http://home.planet.nl/~roden171 Another site with good detail]
* [http://www.paxmuseum.com/s2/S2.htm S-2 Tracker at Patuxent River Naval Air Museum]
* [http://www.pilotoviejo.com Memorias del Tiempo de Vuelo]
* [http://www.faqs.org/docs/air/avtrakr.html The Grumman Tracker, Trader, & Tracer]
* [http://www.shearwateraviationmuseum.ns.ca/exhibits/tracker.htm CS2F Trackers at Shearwater Aviation Museum]

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