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Variants
F4F-3 - US Navy orders followed as did some (with Wright Cyclone engines) from France; these ended up with the Royal Navy's Fleet Air Arm after the fall of France and entered service on 8 September 1940. These aircraft, designated by Grumman as G-36A, had a different cowling from other earlier F4Fs and fixed wings, and were intended to be fitted with French armament and avionics following delivery. In British service initially, the aircraft were known as the Martlet I, but not all Martlets would be to exactly the same specifications as US Navy aircraft. All Martlet Is featured the four .50 in (12.7 mm) M2 Browning machine guns of the F4F-3 with 450 rpg. The British directly ordered and received a version with the original Twin Wasp, but again with a modified cowling, under the manufacturer designation G-36B. These aircraft were given the designation Martlet II by the British. The first 10 G-36Bs were fitted with non-folding wings and were given the designation Martlet III.
These were followed by 30 folding wing aircraft (F4F-3As) which were originally destined for the Hellenic Air Force, which were also designated Martlet IIIs. On paper, the designation changed to Marlet III(A) when the second series of Martlet III was introduced.
Poor design of the armament installation on early F4Fs caused these otherwise reliable machine guns to frequently jam, a problem common to wing-mounted weapons of many US fighters early in the war. It was an F4F-3 flown by Lieutenant Edward O'Hare that in a few minutes shot down five Mitsubishi twin-engine bombers attacking Lexington off Bougainville on 20 February 1942. But contrasting with O'Hare's performance, his wingman was unable to participate because his guns would not function.
A shortage of two-stage superchargers lead to the development of the F4F-3A, which was basically the F4F-3 but with a 1,200 hp (890 kW) Pratt & Whitney R-1830-90 radial engine with a more primitive single-stage two-speed supercharger. The F4F-3A, which was capable of 312 mph (502 km/h) at 16,000 ft (4,900 m), was used side by side with the F4F-3, but its poorer performance made it unpopular with US Navy fighter pilots. The F4F-3A would enter service as the Martlet III(B).
At the time of Pearl Harbor, only Enterprise had a fully equipped Wildcat squadron, VF-6 with F4F-3As. Enterprise was then transferring a detachment of VMF-211, also equipped with F4F-3s, to Wake. Saratoga was in San Diego, working up for operations of the F4F-3s of VF-3. 11 F4F-3s of VMF-211 were at the Ewa Marine Air Corps Station on Oahu; nine of these were damaged or destroyed during the Japanese attack. The detachment of VMF-211 on Wake lost seven Wildcats to Japanese attacks on 8 December, but the remaining five put up a fierce defense, making the first bomber kill on 9 December. The destroyer Kisaragi was sunk by the Wildcats, and the Japanese invasion force retreated.
In May 1942, the F4F-3s of VF-2 and VF-42, onboard Yorktown and Lexington, participated in the Battle of the Coral Sea. Lexington and Yorktown fought against the Zuikaku, Sho-kaku and the light carrier Sho-ho- in this battle, in an attempt to halt a Japanese invasion of Port Moresby on Papua. During these battles, it became clear that attacks without fighter escort amounted to suicide, but that the fighter component on the carriers was completely insufficient to provide both fighter cover for the carrier and an escort for an attack force. Most US carriers carried less than 20 fighters.
F4F-3S "Wildcatfish" - The Grumman F4F-3S "Wildcatfish", a floatplane version of the F4F-3. Edo Aircraft fitted one F4F-3 with twin floats.
The Grumman F4F-3S Wildcatfish (or Wild Catfish), BuNo 4083, 1943
[Source: U.S. Navy]
The F4F-3S was first flown 28 February 1943. The weight and drag of the floats reduced the maximum speed to 241 mph (388 km/h). As the performance of the basic F4F-3 was already below that of the Zero, the F4F-3S was clearly of limited usefulness. Edo provided 100 sets of floats, but the construction of the airfields at forward bases by the "Seabees" was surprisingly quick. Only one was converted and the project was cancelled.
F4F-4 - A new version, the F4F-4, entered service in 1942 with six machine guns and folding wings which allowed more aircraft to be crammed on a carrier, increasing the number of fighters that could be parked on a surface by more than a factor of 2. The F4F-4 was the definitive version that saw the most combat service in the early war years, including the Battle of Midway. The F4F-3 was replaced by the F4F-4 in June 1942, during the Battle of Midway; only VMF-221 still used them at that time.
This version was less popular with American pilots because the same amount of ammunition was spread over two additional guns, decreasing firing time. With the F4F-3's four .50 in (12.7 mm) guns and 450 rpg, pilots had 34 seconds of firing time; six guns decreased ammunition to 240 rpg, which could be expended in less than 20 seconds. The increase to six guns was attributed to the Royal Navy, who wanted greater firepower to deal with German and Italian foes. Jimmy Thach is quoted as saying, "A pilot who cannot hit with four guns will miss with eight." Extra guns and folding wings meant extra weight, and reduced performance: the F4F-4 was capable of only about 318 mph (512 km/h) at 19,400 ft (5,900 m). Rate of climb was noticeably worse in the F4F-4; while Grumman optimistically claimed the F4F-4 could climb at a modest 1,950 ft (590 m) per minute, in combat conditions, pilots found their F4F-4s capable of ascending at only 500 to 1,000 ft (150 to 300 m) per minute.
Moreover, the F4F-4's folding wing was intended to allow five F4F-4s to be stowed in the space required by two F4F-3s. In practice, the folding wings allowed an increase of about 50% in the number of Wildcats carried aboard US fleet aircraft carriers. A variant of the F4F-4, designated F4F-4B for contractual purposes, was supplied to the British with a modified cowling and Wright Cyclone engine. These aircraft received the designation of Martlet IV.
FM-1/-2 Wildcat - General Motors / Eastern Aircraft produced 5,280 FM variants of the Wildcat. Grumman's Wildcat production ceased in early 1943 to make way for the newer F6F Hellcat, but General Motors continued producing Wildcats for both US Navy and Fleet Air Arm use. Late in the war, the Wildcat was obsolescent as a front-line fighter compared to the faster (380 mph/610 km/h) F6F Hellcat or much faster (446 mph/718 km/h) F4U Corsair. However, they were adequate for small escort carriers against submarine and shore threats. These relatively modest ships carried only two types of aircraft (along with the GM-built Avengers). The Wildcat's lower landing speed and ability to take off without a catapult made it more suitable for shorter flight decks. At first, GM produced the FM-1, identical to the F4F-4, but reduced the number of guns to four, and added wing racks for two 250 lb (110 kg) bombs or six rockets. Production later switched to the improved FM-2 (based on Grumman's XF4F-8 prototype) optimized for small-carrier operations, with a more powerful engine (the 1,350 hp (1,010 kW) Wright R-1820-56), and a taller tail to cope with the torque.
Tasked with supporting ground forces off Leyte, sorely under-armed aircraft from escort carriers such as Gambier Bay in the "Taffy" task groups found themselves up against a major surface fleet, which they helped turn back in the Battle off Samar. Four FM-2 Wildcats from Shamrock Bay's Composite Squadron 94 (VC-94) helped shoot down a number of kamikaze aircraft attacking Laffey off Okinawa before running out of ammunition.
F4F-7 - The F4F-7 was a photoreconnaissance variant, with armor and armament removed. It had non-folding "wet" wings that carried an additional 555 gal (2,101 L) of fuel for a total of about 700 gal (2,650 L), increasing its range to 3,700 mi (5,955 km). A total of 21 were built.
F2M Wildcat - The F2M-1 was a planned development of the FM-1 by General Motors / Eastern Aircraft to be powered by the improved XR-1820-70 engine, but the project was cancelled before any aircraft were built.
Martlet Mk I - At the end of 1939, Grumman received a French order for 81 aircraft of model G-36A, to equip their new Joffre-class aircraft carrier: Joffre and Painlevé. The main difference with the basic model G-36 was due to the unavailability for export of the two-stage supercharged engine of F4F-3. The G-36A was powered by the nine-cylinder, single-row R-1820-G205A radial engine, of 1,200 hp (890 kW) and with a single-stage two-speed supercharger.
The G-36A had also French instrumentation, radio, and gunsight. The throttle was modified to conform to French pre-war practice: the throttle lever was moved towards the pilot, (i.e., backward), to increase engine power. The armament which was to be fitted in France was six 7.5 mm (.296 in) Darne machine guns (two in the fuselage and four in the wings). The first G-36A was flown on 11 May 1940.
After the defeat of France, all contracts were taken over by Britain. The throttle was modified again, four 0.50 in (12.7 mm) guns were installed in the wings, and most traces of the original ownership removed. The Martlets were modified for British use by Blackburn, which continued to do this for all later marks. British gunsights, catapult spools, and other items were installed. After initial attempts to fit British radio sets, it was decided to use the much superior American equipment.
The first ones entered service in August 1940, with 804 Naval Air Squadron, then stationed at Hatson in the Orkney Islands. The Martlet Mk I did not have a wing folding mechanism, and was therefore only used from land bases.
In 1940, Belgium also placed an order for at least 10 Martlet Mk 1s. These were to be modified with the removal of the tailhook, however, after the surrender of Belgium, none were delivered and by May 10, 1940, the aircraft order was transferred to the Royal Navy.
Martlet Mk II - Before the Fleet Air Arm took on charge the Martlet Mk Is it had already ordered 100 G-36B fighters. The British chose the Pratt & Whitney R-1830-S3C4-G engine to power this aircraft; this too had a single-stage, two-speed supercharger. The FAA decided to accept a delay in delivery to get folding wings, which were vitally important if the Martlet was to be used from British carriers with their small hangar decks. Nevertheless, the first 10 received had fixed wings. The first Martlet with folding wings was not delivered before August 1941.
In contrast to USN F4F-3, the British aircraft were fitted with armor and self-sealing fuel tanks. The Mk II also had a larger tailwheel. For carrier operations, the "sting" tail hook and attachment point for the American single-point catapult launch system were considered important advantages. Nevertheless, the Martlets were modified to have British-style catapult spools. The FAA had ordered G-36Bs with fixed wings, but wing-folding allowed a carrier to handle a larger numbert of aircraft, so the contract was amended to specify the folding wings, but the first ten of the order had already been built with fixed wings. Deliveries of the folding-wing G-36Bs began in August 1941, with 36 shipped to UK and 54 shipped to the Far East; they were designated "Martlet Mark II".
The Martlet was the second single-seat, monoplane fighter to operate from Royal Navy aircraft carriers following the introduction of the Sea Hurricane IB on HMS Furious in July 1941.
The majority of the Martlet Mk IIs were sent to the Far East. The first shipboard operations of the type in British service were in September 1941, on board of HMS Audacity, a very small escort carrier with a carrier deck of 420 ft (130 m) by 59 ft (18 m), no elevators and no hangar deck. The six Wildcats were parked on the deck at all times. On its first voyage, it served as escort carrier for a convoy to Gibraltar. On 20 September, a German FW 200 was shot down. On the next voyage, four Fw 200 Condors fell to the guns of the Martlets. Operations from Audacity also demonstrated that the fighter cover was useful against U-boats. Audacity was sunk by an U-boat on 21 December 1941, but it had already proven the usefulness of escort carriers.
In May 1942, the 881 and 882 squadrons on HMS Illustrious, participated in operations against Madagascar. In August 1942, 806 NAS on HMS Indomitable provided fighter cover for a convoy to Malta. Later in that year they participated in the landings in French North Africa.
Martlet Mk III - The first 30 F4F-3As were released for sale to Greece, after the Italian invasion in November 1940. However, at the defeat of Greece in April 1941 the aircraft had only reached Gibraltar. They were taken over by the FAA as Martlet Mk III-B. As these aircraft did not have folding wings, they were only used from land bases. They served in a shore-based role in the Western Desert.
Ten fixed-wing G-36Bs were used by the FAA as Martlet III-A.
Martlet Mk IV - The Royal Navy purchased 220 F4F-4s adapted to British requirements. The main difference was the use of a Wright R-1820-40B Cyclone in a distinctly more rounded and compact cowling, with a single double-wide flap on each side of the rear and no lip intake. These machines were named Martlet Mk IV.
Martlet Mk V - The Fleet Air Arm purchased 312 FM-1s, originally with the designation of Martlet V. In January 1944, a decision was made to retain the American names for US-supplied aircraft, redesignating the batch as the Wildcat V.
Sources:
Wikipedia
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