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Grumman S-2 Tracker / Turbo Tracker / S2F-1 Sentinel


Grumman S-2E

Grumman's S-2 Tracker was the first of the US Navy's post-Second World War aircraft to combine the ASW roles of 'hunter' and ‘killer’. Prior to its entry into operational service, no one aircraft with adequate performance ad the capability to carry the necessary equipment to seek the submarine, as well as the weapons to destroy it.

The prototype was first flown on 4 December 1952 and S-2A Trackers entered service with the US Navy in 1954. The initial production version was designated S-2A (CP-121, formerly CS2F-1 for the Canadian version).


The mainplanes and tail surfaces are un-swept, with dihedral on the tailplane. Small ailerons are supplemented by long-span spoilers on the top surfaces of the wings. There are fixed leading edge slots on the outer wings and long span slotted trailing edge flaps. The rudder is divided vertically into two parts, the forward part being used only during take-off, landing and single-engine flight. The tricycle undercarriage has twin nose-wheels and single wheel on each main unit. All wheels retract rearward. A partially retractable bumper-wheel is under the rear fuselage, and an arrester hook is under the tail.


CP-121 Tracker 12195 of 880 Sqn RCAF, 1987


The S-2B had new anti-submarine detection equipment, and the TS-2B was a trainer.

The S-2E was powered by two 1,136.4kW / 1,525 hp Wright R-1820-82WA piston engines, and stores which can be deployed include sonobuoys, depth charges, a nuclear depth bomb, bombs, torpedoes, and rockets. The US Navy also operates an AEW version of this aircraft known as the E-1B Tracer.

Other variants include:
S-2G with enlarged bomb bays to house two homing torpedoes (most converted to US-2C or RS-2C)
S-2D with improved anti-submarine equipment, wider cockpit and longer range
S-2F with uprated submarine detection equipment
S-2G, early version uprated with a Martin Marietta kit
US-2A/C, S-2A/C converted for target towing
US-2B utility/transport conversion of the S-2B
RS-2C, S-2C converted for photo-reconnaissance/ survey work
AS-2D, S-2D modified for night attack
E-1B Tracer, AEW version with a radome on its back.

A number of Argentinian S-2E Trackers were up-graded by IAI, including replacing the engines with Garrett TPE331-15  turboprops and 5 blade Hartzell props, to be re-designated S-2UP.

Starting in 1952, Grumman built nearly 1,200 S-2 Trackers, for US Navy and a dozen or so other users, including Argentina, Brazil, Peru, S Korea, Taiwan, Thailand, Turkey, Uruguay and Venezuela.


In production for the U.S. Navy and in Canada for the Royal Canadian Navy in 1955 as the S2F-1 Sentinel. The S2F-2 is similar, but has a large radar scanner, similar to that carried by AD4W “guppy" Skyraiders, built into the bottom of its fuselage under the cockpit. Both versions combine search and strike duties in a single aircraft. TF-1 trainer is similar. So is transport version, able to carry 8 passengers or over 1,600 lb. cargo for shore-to-ship supply.


Canadian de Havilland built Tracker


The RAAF purchased 32 S-2E/G Trackers, the first was delivered on 9 Nov 1966 and last delivered on 16 Mar 1977.

Grumman, with Tracor, developed the S-2T with 1,650 shp (1 230 kW) Garrett TPE331-1-AW turboprops primarily to meet Taiwanese interest.

The Canadian Government decided on the Grumman Tracker, and 100 examples were built by de Havilland Canada under license in Downsview, Ontario, with Wright R-1820 engines of 1530 hp. Originally designated CS2F, the Canadian Trackers flew their sub-hunting missions from land bases and the HMCS Bonaventure.


S2F-1 Sentinel


Canada has a programme to fit 1,100 shp (820 kW) Pratt & Whitney PT6A-67Rs in its locally-produced CP-121 Trackers (28 in service).

The Tracker continued active operation until April 1991, when the last Tracker was retired.




S2F-1 Sentinel
Carrier-based anti-submarine aircraft
Crew: 4
Engines: 2 x Wright R1820-76, 1,425 h.p.
Wingspan: about 69 ft.
Loaded weight: approx. 20,000 lb.
Armament: 20 mm. guns in nose
Bombload: 6,000 lb


Engines: 2 x Wright R-1820-82, 1525 hp
Props: 3 blade
Wingspan: 72 ft 7 in
Length: 43 ft 6 in
Height: 16 ft 7.5 in
Wing area: 499 sq. ft
Empty weight: 18,315 lb
MTOW: 26,147 lb
Max speed: 280 mph
Service ceiling; 22,000 ft
Endurance: 9 hr at 150 mph at 1500 ft
Hardpoints: 6

Engines: 2 x Wright R-1820-82WA Cyclone, 1,530 hp (1141 kW)
Max take-off weight: 13222 kg / 29150 lb
Empty weight: 8505 kg / 18750 lb
Wingspan: 22.12 m / 72 ft 7 in
Length: 13.26 m / 43 ft 6 in
Height: 5.05 m / 16 ft 7 in
Wing area: 46.08 sq.m / 496.00 sq ft
Max. speed: 426 km/h / 265 mph
Cruise speed: 241 km/h / 150 mph
Range w/max.fuel: 2092 km / 1300 miles
Crew: 4

Engines: 2 x Wright Cyclone, 1,520 hp
Wing Span: 72 ft 7 in
Length: 43 ft 6 in
Height: 16 ft 7 in
Empty weight: 18,750 lb
Loaded weight: 29,150 lb
Ceiling: 21,000 ft
Speed: 265 mph (sea level)
Endurance: 9 hr
Armament: 2 x torpedoes / 4 depth charges (bomb bay)
Hardpoints: 6 x / 250 lb
Crew: 4

Engines: 2 x Garrett TPE331-1-AW turboprops, 1,650 shp (1230 kW)

Engines: 2 x Garrett TPE331-15  turboprop.

Engine: 2 x Wright R-1820-82, 1,530 hp (1141 kW).
Wing Span: 69 ft 8 in
Speed: 140 mph (240km/h)

Engine: 2 x Pratt & Whitney PT6A-67R, 1,100 shp (820 kW).



S2F-1 Sentinel



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