The Vought F4U Corsair
Early in the Pacific War, US Navy and Marine Corps fighter pilots found themselves outclassed by the agile and well-armed Japanese A6M Zero, but even then work was underway to provide them with better aircraft. One of those better aircraft was the Vought "F4U Corsair", a rugged, powerful, and somewhat unforgiving aircraft that featured a distinctive inverted gull wing.
The Corsair proved more than a match for the Zero, and it would also prove to be an excellent fighter-bomber, serving in this role in the Korean War and in the French colonial wars in Indochina and Algeria. This document provides a history and description of the Corsair.
 CORSAIR ORIGINS
 F4U-1 CORSAIR DESCRIBED / F4U-1A / F4U-1C / F4U-1D
 CORSAIR IN THE PACIFIC WAR
 F4U-2 / F4U-3 / F4U-4 / F2G
 CORSAIR IN BRITISH & NEW ZEALAND SERVICE
 F4U-5 / AU-1 / F4U-7 / CORSAIR IN KOREA
 F4U-7 / CORSAIR IN INDOCHINA / TWILIGHT
 CORSAIR PRODUCTION SUMMARY
 COMMENTS & SOURCES
 CORSAIR ORIGINS
On 1 February 1938, the US Navy issued a request for proposals for a new high-performance single-seat carrier-based fighter that would use the most powerful engine available at the time. At the Vought-Sikorsky (later Chance Vought) Division of the United Aircraft Corporation (UAC) group in Connecticut, a design team under Rex B. Beisel decided to build the aircraft, which they referred to as the "Model V-166B", around the new XR2800 Double Wasp 18-cylinder two-row air-cooled radial engine, with 1,500 kW (2,000 HP), built by Pratt & Whitney (P&W), another UAC division.
Such a large engine needed a big propeller to soak up the power, and so the design featured a 4.06 meter (13 foot 4 inch) three-blade variable-pitch constant-speed propeller designed by Hamilton Standard, yet another UAC division. The big propeller posed a problem for the design team. It dictated long landing gear so that the prop arc would clear the ground on takeoffs and landings, but long landing gear tended to be too weak to tolerate hard carrier landings. The designers came up with the notion of a low-mounted "inverted gull wing" or "cranked wing", in which the wings bent down from the root and then back up to the tip, with the main landing gear at the lowest point of the wing. The wing arrangement also improved the pilot's field of view, and the right-angle connection between the wing and the fuselage improved aerodynamics.
The US Navy ordered a prototype of the Vought design as the "XF4U-1" in June 1938. Armament was planned as two 7.62 millimeter (0.30 caliber) Browning machine guns in the top of the nose and a single 12.7 millimeter (0.50 caliber) Browning machine gun in each wing, for a total of four guns. The prototype also had little bombbays in the outer wings for fragmentation bombs that would be dumped on enemy bomber formations, with a window in the cockpit floor for sighting. The bombbays were a screwball idea that would be quickly abandoned.
Vought engineers completed a full-scale mockup of the XF4U-1 in early 1939 for wind tunnel tests and Navy inspection. The initial flight of the prototype XF4U-1 was on 29 May 1940, with Vought chief test pilot Lyman A. Bullard JR at the controls. The aircraft suffered from excessive vibration and Bullard was in an agitated mood when he got back to the ground. The prototype was badly damaged in July, when storms prevented test pilot Boone T. Guyton from reaching the Vought airfield at Stratford, Connecticut. He was running low on fuel and couldn't raise any other airfield on his radio, so he tried to put the machine down on a golf course at Norwich, Connecticut. He touched down properly, but the grass was slick with rain and he plowed into trees, flipping the aircraft over and around. One wing was torn off, the fuselage was bashed up, but Guyton was little more than shaken and bruised, thanks to the toughness of the design.
The prototype was rebuilt in a few months, and demonstrated the design's performance on 1 October 1940, clocking 650 KPH (404 MPH). However, the promise of the type was balanced by continuing difficulties, including a nasty tendency of the Double Wasp engine to catch on fire; a tendency of the engine to conk out at high altitude; and some clear handling problems, such as bad spin recovery. Some things were fixed, others were inherent in the design -- when Boone Guyton was later asked by Navy pilots about spinning the F4U, his answer was minimal: "Don't."
The problems clearly meant delays in getting the type into production. To compound the delays, reports coming back from the war in Europe indicated that an armament of two 7.62 millimeter and two 12.7 millimeter machine guns was too light, and so when the US Navy asked for production proposals in November 1940, heavier armament was specified. The twin 7.62 millimeter Brownings in the nose were eliminated and two 12.7 millimeter Brownings were fitted in each wing. The wing guns were staggered to avoid mechanical interference between their ammunition feeds. The armament change required considerable design adjustments that piled up more delays.
There was another troublesome consequence: putting all the guns in the wings meant eliminating wing fuel tankage, and so the forward fuselage was stretched by 45 centimeters (18 inches) to include a new self-sealing tank in the center of the fuselage. The fuel tank also meant moving the cockpit back by about 91 centimeters (3 feet), which made it hard for a pilot to see over the nose when taxiing, taking off, or landing. There would never be any way around the long nose, one pilot later recollecting that he used to tell himself after he lined up for the approach: "God, I hope there's nobody on that runway!"
Formal naval acceptance trials for the XF4U-1 began in February 1941, and the initial Navy production order for 584 "F4U-1s" was placed on 30 June 1941. The type was given the name "Corsair", which had been the name of several prewar Vought aircraft. The first production F4U-1 performed its initial flight on 24 June 1942, once again with Boone Guyton at the controls.
The type quickly underwent a few more improvements, with the number of 12.7 millimeter Brownings in each wing increased to three, for a total of six; the addition of 70 kilograms (155 pounds) of armor around the cockpit and the oil tank, plus an armor glass windscreen and self-sealing fuel tanks; fit of shorter flaps and wider ailerons; and installation of an uprated R-2800-8 Double Wasp engine with a two-stage supercharger and 1,490 kW (2,000 HP) takeoff power to handle the aircraft's increased weight.
The US Navy received its first production F4U-1 on 31 July 1942, with carrier trials beginning on the USS SANGAMON on 25 September 1942. Getting the machine into service proved difficult. The framed "birdcage" style canopy provided inadequate visibility for deck taxiing, a serious concern given the kind of damage the oversize prop could do to anybody or anything that got in its way. Even more seriously, the machine had a nasty tendency to "bounce" on touchdown, which could cause it to miss the arresting hook and slam into the crash barrier, or even go out of control. The long "hose nose" visibility problem has already been mentioned, and there was the inevitable issue of the enormous torque of the Double Wasp: if a pilot was waved off a carrier landing, he would throttle up and bank off to the left for another pass, and the Corsair had a nasty tendency to flip over on its back if revved up incautiously. Yet another peculiarity was that, due to propwash effects, the left wing would stall before the right on the landing approach, which tended to make the aircraft roll to the left as well.
Production was going ahead anyway, with Vought building 178 Corsairs by the end of 1942. The company was working with the Marine Corps, which saw the potential of the type and by nature was less intimidated than the Navy by the aircraft's unpleasant features, to work out the bugs in parallel with production. Although the Navy would come to accept the F4U, the Corsair would always be more of a Marine than a Navy fighter. The type was declared "ready for combat" at the end of 1942, though it was originally only qualified to operate from land bases until carrier qualification issues were worked out.
A dozen F4U-1s arrived at Henderson Field on Guadalcanal in the Solomon Islands on 12 February 1943. The US Navy didn't get into combat with the type until September 1943, and in fact the British Royal Navy's Fleet Air Arm (FAA) would qualify the type for carrier operations first.
It was an indication of the haste in which the US was putting new combat aircraft into production at the time that well before Vought began production of the F4U, other manufacturers were being enlisted to build the Corsair, with Goodyear signed up in November 1941 and Brewster following in December. The Goodyear variant of the F4U-1 was designated the "FG-1" and featured fixed instead of than folding wings; it was intended to fly off land bases, not carriers. Initial flight of the first Goodyear FG-1 was on 25 February 1943, with deliveries beginning in April. The Brewster version was the "F3A-1", and was essentially identical to the F4U-1. Initial flight of the first Brewster F3A-1 was on 26 April 1943, with deliveries beginning in July.
 F4U-1 CORSAIR DESCRIBED / F4U-1A / F4U-1C / F4U-1D
The F4U-1, as it emerged, was an aircraft that would be difficult to confuse with any other in widespread service at the time, or for that matter later. It was easily recognized by its gull wing and the big three-bladed Hamilton Standard propeller, powered by a R-2800-8 engine. It was also a big machine by the standards of the time; a set of handholds / footsteps was embedded in the right side of the fuselage beneath the cockpit to allow the pilot to get in and out without a ladder.
The F4U-1 was of basically conventional monocoque construction, made mostly of metal, although the ailerons had wood frames and plywood skinning, while the rudder, elevators, and outer wings had metal frames and fabric skinning. The flaps were all metal. The tailfin was slightly offset from the centerline to help compensate for engine torque. There were trim tabs on the ailerons and the rudder.
The Corsair was exceptionally strong and featured substantial armor protection. The main landing gear was fitted into the inner wing section, just inside the "bend" where the wing fold was, and rotated 90 degrees to lie flat inside the wing. The tailwheel was semi-retractable. There was a stinger-type arresting hook just behind the tailwheel.
There were inlets in the leading edge of the wings near the wingroot for the supercharger and oil cooler system. Although the original internal wing fuel tanks had been removed, the design team figured out how cram a small tank into each outer wing. The wings hydraulically folded straight up toward the aircraft centerline. The three Browning machine guns in each wing were just outboard of the wing fold. The two inner guns had an ammunition capacity of 400 rounds per gun each, while the outer gun had 375 rounds per gun, with the pilot aiming the guns with a reflector-type gunsight. The F4U-1 could carry a centerline external fuel tank with a capacity of 662 liters (175 US gallons).
The F4U-1, as mentioned, originally had a framed, backwards sliding canopy, with "cutouts" behind it like those used on the Curtiss P-40 Warhawk, to improve rearward visibility. Electronics included a multichannel radio and the new "identification friend or foe (IFF)" set, developed by the British. The cockpit was roomy by the standards of the time. A typical early color scheme was two-tone light and medium blue on top, with light gray on the bottom.
Some F4U-1s were modified in the field for the photo-reconnaissance role and designated "F4U-1P". They were fitted with a vertically mounted K-21 camera in the belly, between the trailing edge of the wing and the tailwheel. The number of conversions is unclear.
As mentioned, the Corsair's initial deficiencies were being worked out on a concurrent basis. The tendency to "bounce" on landings, due to the excessive stiffness of the shock absorber elements in the main landing gear struts, was greatly reduced after Vought engineers tweaked the stiffness to get the right value. The 689th production F4U-1 featured a number of significant changes. The most noticeable was that the cockpit was raised 18 centimeters (7 inches) to improve the pilot's forward view, and a clear-view bulged canopy, along the lines of the "Malcolm Hood" used on later model Spitfires, replaced the original "birdcage" framed canopy to provide better all-round field of view.
Other changes included a raised tailwheel leg, with a pneumatic instead of solid tire, to improve the pilot's forward view on the ground; and an almost unnoticeable 15 centimeter (6 inch) fixed "stall strip" that was fitted to the leading edge of the right wing outboard of the guns to ensure that both wings stalled at the same time on landing approach. The 1,550th production F4U-1 introduced an R-2800-8W engine with water-methanol injection for boost power of 1,664 kW (2,230 HP).
F4U-1s with the new canopy were later retroactively designated "F4U-1A". Although sources vary widely on the number of F4U-1As built, 2,126 seems to be a reasonable value. The Goodyear equivalent was the "FG-1A", which like the FG-1 lacked wing fold.
VOUGHT F4U-1A CORSAIR:
Spec: Metric - English
wingspan: 12.49 meters - 41 feet
wing area: 29.17 sq_meters - 314 sq_feet
length: 10.16 meters - 33 feet 4 inches
height: 4.9 meters -16 feet 1 inch
empty weight: 4,074 kilograms - 8,892 pounds
MTO weight: 6,350 kilograms - 14,000 pounds
max speed at altitude: 671 KPH - 417 MPH / 363 KT
service ceiling: 11,250 meters - 36,900 feet
range: 1,633 kilometers - 1,015 MI / 883 NMI
The "F4U-1C" was introduced in August 1943, and featured four M2 20 millimeter cannon in place of the six 12.7 millimeter Brownings. The cannons had 120 rounds each. The F4U-1C was otherwise much like the F4U-1A. The F4U-1C's four cannon proved particularly useful in the ground-attack role. The F4U-1C went into service in the spring of 1945, and 200 were built by Vought.
The "F4U-1D" was introduced in April 1944, though the F4U-1C remained in production in parallel. The F4U-1D was much the same as the F4U-1A, retaining the six Browning machine guns, and differed mainly in being fitted for carriage of a 605 liter (160 US gallon) centerline drop tank and two 450 kilogram (1,000 pound) bombs, one on each inner wing near the wingroot. The two wingroot pylons were also "wet" and could carry fuel drop tanks. The idea of using the Corsair to carry heavy munitions had been developed in the field, with operational squadrons improvising bomb racks for the purpose. The F4U-1D made it "official". F4U-1Ds were all painted in the standard color scheme for Corsairs at the time, a dark overall sea blue.
Vought built a total of 1,685 F4U-1Ds. Goodyear built the F4U-1D as the "FG-1D", delivering a total of 1,997 (some sources claim 2,303) aircraft. Brewster also built it as the "F3A-1D", though Brewster was out of the Corsair business by July 1944. The company had only delivered a total of 735 Corsairs by that time, and the Navy terminated the contract with the company, citing unsatisfactory management. In general, Brewster's efforts during the war proved so troublesome that there were rumors that Nazi agents had infiltrated the organization and were causing all the trouble, but that sounds like a joke.
Late production F4U-1Ds and FG-1Ds featured four launch rails on each outer wing for 12.7 centimeter (5 inch) "High Velocity Air Rocket (HVAR)" projectiles. The rockets were sighted through the gunsight and proved accurate. Late in the war, Vought converted an F4U-1D into a tandem-seat trainer, but nobody was interested and it didn't go into production.
 CORSAIR IN THE PACIFIC WAR
The Corsair, as mentioned, had begun its first combat deployment, to Guadalcanal, in early 1943. The first recorded combat engagement was on 14 February 1943, when Corsairs of Marine Squadron VMF-124 under Major William E. Gise assisted P-40 Warhawks and P-38 Lightnings in escorting B-24 Liberators on raids against the major Japanese base at Bougainville at the northwest corner of the Solomons. Japanese fighters contested the raid and the Americans got the worst of it, with four P-38s, two P-40s, two Corsairs, and two Liberators lost. No more than four Japanese Zeroes were destroyed. A Corsair was responsible for one of the "kills", but it wasn't anything to boast about, since it was due to a midair collision. The fiasco was referred to as the "Saint Valentine's Day Massacre".
Although the Corsair's combat debut was not impressive, the Marines quickly learned how to make better use of the machine and demonstrate its superiority over Japanese fighters. By April 1943, the Corsair was getting the upper hand. By May, VMF-124 had produced the first Corsair ace, 2nd Lieutenant Kenneth A. Walsh, who would rack up a total of 21 kills during the war.
According to old stories, the Japanese learned to call the F4U "Whistling Death" because of the high-pitched sound it made, though such a melodramatic name sounds suspiciously like an invention of American publicists. It was also known as the "Bent Wing Bird", though on the other side of the coin this name sounds more like something out of company press releases. Whatever the enemy or the aircrew actually called the F4U, it was still a machine to be reckoned with, one way or another. Many pilots became aces in the Corsair, but even its most passionate advocates admitted that it was a handful.
The most prominent gang of Marine Corsair pilots was squadron VMF-214, led by Major (later Colonel) Greg "Pappy" Boyington. Boyington was a rowdy, combative, tough, hard-drinking Marine who had flown Curtiss P-40s with Claire Chennault's American Volunteer Group (AVG) or "Flying Tigers" in China and scored two kills. Chennault had thrown him out after somebody broke into the liquor locker, concluding that Boyington was responsible because nobody else in the Flying Tigers was strong enough to have wrenched open the padlock with his bare hands.
VMF-214 "Boyington's Bastards" or "Black Sheep" racked up large scores against the Japanese in the South Pacific, with Boyington claiming a total of 28 kills during his combat career, 22 of them in the F4U. He was shot down and captured by the Japanese on 3 January 1944 and spent the rest of the war in a prison camp. The Japanese did not announce his capture and Boyington was presumed killed in action. He would get the Medal of Honor after his release from captivity at the end of the war.
After finally working out the worst bugs, the Navy finally embraced the Corsair as the most capable fighter and fighter-bomber in its inventory, superior to the Grumman F6F-3 Hellcat. By early 1944, the Navy was making good use of the Corsair. The first Navy F4U squadron, VF-17 "Jolly Rogers" AKA "Skull & Crossbones", produced 12 aces, the most prominent being Lieutenant Ira Kepford, with 19 kills.
By the spring of 1944, Marine pilots were beginning to exploit the type's considerable capabilities in the close-support role, supporting amphibious landings with 450 kilogram (1,000 pound) bombs. The famed pilot Charles Lindbergh flew Corsairs with the Marines as a civilian technical advisor in order to determine how best to increase the Corsair's warload and effectiveness in the attack role. Lindbergh managed to get the F4U into the air with 1,800 kilograms (4,000 pounds) of bombs, with a 900 kilogram (2,000 pound) bomb on the centerline and a 450 kilogram (1,000 pound) bomb under each wing. In the course of such experiments, he performed strikes on Japanese positions during the battle for the Marshall Islands.
By the beginning of 1945, the Corsair was a full-blown "mudfighter", performing strikes with high-explosive bombs, napalm tanks, and HVARs. In dive-bombing attacks, it was almost as accurate as the Douglas SBD "Slow But Deadly" dive-bomber. The F4U was a prominent participant in the fighting for the Palaus, Iwo Jima, and Okinawa, with the ground-pounders calling it the "Sweetheart" for its welcome services when things were getting nasty.
In the last months of the conflict, the F4U also carried the oversized 29.8 centimeter (11.75 inch) "Tiny Tim" unguided rocket on the wingroot pylons for cracking Japanese strongpoints. The Tiny Tim had to be dropped on a trapeze pylon to clear the propeller; qualifying the rocket for carriage proved troublesome and a number of Corsairs were lost in the process. Experiments were performed in 1944 with an old F4U-1 with "jet assisted take-off (JATO)" gear, featuring a small solid-fuel rocket attached on the fuselage just behind each wingroot, to allow the Corsair to get off the ground more easily with heavy loads, but it appears that JATO was rarely, if ever, used in service with the Corsair.
One unusual store carried by the Corsair was an ice-cream factory. Late in the war one squadron in the Palaus found the action slow, and to stave off boredom the ground crews rigged 19-liter (5 US gallon) cans with a wind-driven spinner connected to a mixing rotor, and hooked up one under each wing of an F4U. A pilot would take the aircraft up to high altitude for a given period of time and then come back to base with the ice cream.
Statistics compiled at the end of the war indicate that the F4U flew over 64,000 operational sorties for the US Marines and US Navy through the conflict, with fewer than 10,000 of these sorties from carrier decks. The total number of kills claimed was 2,139, against 189 combat losses of F4Us, for a kill ratio of over 11:1. Even if this was exaggerated by a factor of two, it was still an accomplishment. One particularly interesting kill was scored by a Marine Lieutenant R.R. Klingman over Okinawa. According to the story, he was in pursuit of a Kawasaki Ki-45 Toryu ("Nick") twin engine fighter when his guns jammed, so he simply flew up and chopped off the Ki-45's tail with the big propeller of the Corsair.
The Corsair has acquired a legendary status, with the result that its notable bad points have been somewhat glossed over. Those who insist that the Corsair was superior to the Hellcat in every respect should realize that the Hellcat was cheaper than the Corsair -- the Navy could buy five Hellcats for the price of three Corsairs -- and that the Hellcat was a perfectly effective and very rugged fighter and fighter-bomber. More importantly, the Hellcat was much easier to fly, with Corsair pilots freely admitting that the F4U was unforgiving and not a good choice for a green pilot. Over half the losses of Corsairs in the Pacific Theater were credited to accidents and not combat. To experienced pilots, the Corsair was a more exciting and challenging aircraft, but Hellcat's docility was admired as well. Official kill records give the Hellcat the majority of kills in the Pacific Theater.
After the war, there was a surplus of old combat aircraft and it was relatively easy for a civilian to buy a Corsair. The Corsair was a major player in air races for several years, until serious accidents led to the effective suspension of air racing in the early 1950s.
 F4U-2 / F4U-3 / F4U-4 / F2G
When the US Navy came up in November 1941 with an urgent requirement for a night-fighter based on the F4U-1, the Naval Aircraft Factory in Philadelphia took 32 (some sources claim 12) stock F4U-1s and converted them to a night-fighter configuration with the designation "F4U-2".
The F4U-2 was equipped with AN/APS-4 centimetric radar, fitted in a radome on the right wing. One of the three machine guns in the right wing was deleted to balance the radar. Although the radar pod apparently did not greatly interfere in the Corsair's maneuverability, the radar set was relatively fragile, and Corsair night fighter pilots were not inclined to jink their aircraft around unless absolutely necessary. The exhausts on the bottom of the cowling were extended to prevent the glow of the exhaust from being seen by potential victims, giving the F4U-2 something of a scruffy "beard" just before the leading edge of the wing. A number of F4U-2s saw combat in the South Pacific. Apparently there were two field conversions of F4U-1s to F4U-2 standard as well.
Three F4U-1As were converted to use the P&W XR-2800-16C Double Wasp, which featured a two-stage turbocharger for high-altitude performance. A four-bladed Hamilton Standard propeller was fitted to take advantage of the increased power. The engine installation featured a distinctive belly inlet, just behind the cowling. These three aircraft were designated "XF4U-3", "XF4U-3A", and "XF4U-3B", but the installation didn't work out well. The F4U-3 and its Goodyear equivalent, the "FG-3", did not enter production.
The last major wartime production variant of the Corsair was the "F4U-4", which featured a P&W R-2800-18W Double Wasp with 1,567 kW (2,100 HP) takeoff power and water-methanol injection. The only visible differences from the F4U-1D were an inlet fitted in the lower lip of the cowling, giving the aircraft's nose a slightly different profile, and a four-bladed propeller. All following Corsair variants would retain the four-bladed propeller. The F4U-4's engine and propeller gave it a top speed of 718 KPH (446 MPH), about 48 KPH (30 MPH) faster than the F4U-1D. Armament was the same as for the F4U-1D, with six Brownings, stub pylons for eight HVARs, and the ability to carry two 450 kilogram (1,000 pound) bombs and a centerline drop tank.
Five F4U-1s were modified as "XF4U-4" prototypes, with the first performing its initial flight on 19 April 1944. One of the prototypes was fitted with a prop spinner, but this item was not adopted for production. Initial flight of a production F4U-4 was in September 1944, with initial service deliveries in October. A dozen (some sources claim only two) F4U-4s were built by Goodyear with the designation of "FG-4", but the end of the war led to cancellation of further Corsair orders from Goodyear. However, the Navy was still appreciative enough of the F4U-4 to obtain about 400 more from Vought after the war up to 1947.
2,037 standard F4U-4s were built in all. Several subvariants of the F4U-4 were built as well:
297 F4U-4s were fitted with four M2 20 millimeter cannon instead of the six Brownings. Sources disagree on whether these machines were given the designation of "F4U-4B" or "F4U-4C"; "F4U-4B" is used in this document.
One F4U-4 was fitted with AN/APS-6 radar in a pod on the right wing for night fighting and designated "F4U-4N".
Nine F4U-4s were built with an oblique reconnaissance camera in a blister with a sliding window on the left side of the fuselage behind the wing and designated "F4U-4P". They retained full F4U-4 armament.
An F4U-4 was experimentally fitted with wingtip fuel tanks and another was used for trials of a six-bladed contrarotating propeller, but neither of these items was ever incorporated into Corsair production.
One of the more interesting wartime Corsair variants, even if it didn't go into production, was the Goodyear "F2G", which was to be designed around the monster P&W R-4360-4 air-cooled radial engine, with 2,238 kW (3,000 HP) takeoff power. In contrast to the R-2800 Double Wasp, which featured two rows of nine cylinders for a total of 18 cylinders, the R-4360 featured four rows of seven cylinders for a total of 28 cylinders. It was called a "corncob" because of the cylinder arrangement. The engine would see operational service on the big Convair B-36 Peacemaker heavy bomber after the war.
The F2G had a distinctive supercharger / oil system cooler intake on top of the lengthened nose, as well as a bubble-type canopy, a taller tailfin, and other changes. A bubble canopy had been fitted earlier to a Goodyear FG-1A on a trials basis. Armament was six 12.7 millimeter Brownings, plus the external stores arrangement of the F4U-1D.
An old F4U-1 with the birdcage canopy was fitted with the Wasp Major and a four-bladed prop in early 1944 to evaluate the fit. Goodyear received a production contract for the F2G in March 1944, with some of the batch for use from ground bases, featuring manually folding wings and designated "F2G-1"; and others for carrier operations, with hydraulically folding wings and an arresting hook, designated of "F2G-2". Development, particularly of the engine, proved troublesome, and by the time the first F2G, was rolled out in May 1945 the need for the type was evaporating.
Production contracts were cancelled at the end of the war, with only five production F2G-1s and five F2G-2s built. They had been preceded by a number of "XF2G" prototypes, the precise count being unclear, with most or all of these development machines apparently being conversions. At least one F2G flew in air races after the war.
 CORSAIR IN BRITISH & NEW ZEALAND SERVICE
The British Royal Navy Fleet Air Arm (FAA) warmed to the Corsair much faster than the US Navy. In November 1943, the FAA received under Lend-Lease the first of 95 Vought F4U-1s, which were given the designation of "Corsair I". The first squadrons were assembled and trained in the US, either at Brunswick, Maine, or Quonset, Rhode Island, and then shipped across the Atlantic. The Royal Navy put the Corsair into carrier operations immediately, well ahead of the US Navy, but wasn't like the British worked miracles with the F4U: they found its landing characteristics just as beastly, suffering a number of fatal crashes, but bit the bullet and did it anyway.
This initial British batch was followed by 510 Vought F4U-1As under the designation of "Corsair II"; 430 Brewster F3A-1Ds under the designation of "Corsair III"; and finally 977 Goodyear FG-1Ds under the designation of "Corsair IV". It is unclear if the stateside squadron training scheme was retained for all British Corsair squadrons.
All but initial deliveries of FAA Corsairs had 20 centimeters (8 inches) clipped from the wingtips to permit storage in British carrier hangar decks, with the clipped wings also apparently improving the roll rate. Some sources suggest that at least some of the clipped-wing Corsairs supplied to Britain had the US designation of "F4U-1B". Many FAA Corsairs were fitted with rails for launching British 7.62 centimeter (3 inch) unguided "Rocket Projectiles (RPs)". At its peak, the Corsair equipped 19 FAA squadrons.
CORSAIR IN FAA SERVICE SUMMARY:
Variant: Number - Comments
Corsair I: 95 Vought F4U-1s.
Corsair II: 510 Vought F4U-1As.
Corsair III: 430 Brewster F3A-1Ds.
Corsair IV: 977 Goodyear FG-1Ds.
2,012 FAA CORSAIRS
FAA Corsairs originally fought in a camouflage scheme, with a light-green / dark-green disruptive pattern on top and a white belly, but were later painted overall blue. Those operating in the Pacific theater acquired a specialized British insignia -- a modified blue-white roundel with white "bars" to make it look more like a US than a Japanese insignia to prevent friendly-fire incidents.
FAA Corsairs performed their first combat action on 3 April 1944, with Number 1834 Squadron flying from the HMS VICTORIOUS to help provide cover for a strike on the German super-battleship TIRPITZ in a Norwegian fjord. This was apparently the first combat operation of the Corsair off of an aircraft carrier. Further attacks on the TIRPITZ were performed in July and August 1944, with Corsairs from the HMS FORMIDABLE participating. The Corsairs did not encounter aerial opposition on these raids, and in fact the F4U would never have it out with German Luftwaffe aircraft. A confrontation between a Corsair and the tough German Focke-Wulf Fw-190 would have made for an interesting fight.
After the Norwegian operations, British Corsairs switched operations to the Indian Ocean to fight the Japanese, with the first operational sorties on 19 April 1945. Royal Navy carriers would be participants in the final battle for the Japanese home islands. On 9 August 1945, days before the end of the war, Corsairs from HMS FORMIDABLE were attacking Shiogama harbor on the northeast coast of Japan. A Canadian pilot, Lieutenant Robert H. Gray, was hit by flak but pressed home his attack on a Japanese destroyer, sinking it with a 450 kilogram (1,000 pound) bomb but crashing into the sea. He was posthumously awarded the last Victoria Cross of World War II.
At least 424 Corsairs were also provided to the Royal New Zealand Air Force, beginning in late 1943, with a little more than half of them F4U-1As and the rest F4U-1Ds / FG-1Ds. By the time the New Zealanders had worked up to operational Corsair squadrons in 1944 there was little for them to shoot at in the air and they scored no kills, but they kept busy in the attack role, with a fair number of them shot down or lost in accidents. Most of the New Zealander Corsairs were scrapped after the war, as were the British Corsairs.
 F4U-5 / AU-1 / F4U-7 / CORSAIR IN KOREA
As mentioned, F4U-4s continued to be built by Vought in the postwar era, and in fact major new Corsair variants were introduced. Fit of the R-2800-3W engine with 1,716 kW (2,300 HP) takeoff power resulted in the "F4U-5", with the engine mounted on an angle two degrees below the centerline to improve the pilot's view, as well as to provide improved longitudinal stability. There were small distinctive "cheek" inlets along either side of the lower lip of the cowling. Top speed was 743 KPH (462 MPH).
Other features of the F4U-5 included an improved cockpit layout, with folding seat armrests, a slightly raised power-actuated canopy, and other niceties to improve pilot comfort and effectiveness; a fully retractable tailwheel; completely metal outer wing panels (finally!); refinements to control surfaces to improve handling; and a flat armor glass windscreen, though this may have been fitted to late-production F4U-4s as well.
The F4U-5's armament consisted of four M3 (T-31) 20 millimeter cannon, with a total of 924 rounds of ammunition. Provision for eight HVARs, two 450 kilogram (1,000 pound) bombs, and a centerline external fuel tank were retained. The launch stubs for the HVARs were rearranged in a staggered configuration for some reason. The cannon and pitot tube had an electrical heating system to allow them to operate properly in very cold conditions.
Vought built 223 F4U-5s. There was further production of subvariants:
214 were built as "F4U-5N" night fighters, with an AN/APS-6 radar in a pod on the right outer wing. The four cannon were fitted with muzzle flash suppressors.
101 more night fighters were built with additional cold-weather gear during the Korean War and given the designation of "F4U-5NL". These machines featured pneumatic rubber de-icing boots on the leading edge of each outer wing, with the boots pulsed to break off the ice; a heavy duty cockpit heater, which could turn the cockpit into a hotbox on the coldest days; and an alcohol-based prop deicing system. The alcohol from the prop deicing system tended to damage the plastic canopy until a protective film was placed over the plastic. Alcohol fumes also tended to seep into the cockpit, posing both fire and alertness hazards for the pilot. Vought engineers mixed the alcohol with peppermint oil so they could trace down where the fumes were seeping into the cockpit, and fixed the problem with better sealing.
30 F4U-5s were also given a reconnaissance camera fit like that of the F4U-4P and were given the designation of "F4U-5P".
During production of the F4U-5, Corsair manufacturing moved from the Vought plant in Connecticut to a facility in Dallas, Texas. Although by this time the Corsair was outmatched in air combat by the new jet fighters, it was still an excellent attack aircraft, and so Vought designed an optimized close-support variant of the Corsair, originally to be designated the "F4U-6" but going into service as the "AU-1", with the "A" emphasizing its attack role.
The AU-1 featured extensive armor protection, making it substantially heavier and significantly slower than the F4U-5. Some sources claim it was hard-pressed to reach 400 KPH (250 MPH), but that might have been with a full warload and wouldn't be surprising under such circumstances. It featured an R-2800-83W Double Wasp engine with 1,716 kW (2,300 HP) takeoff power but only a single-stage supercharger; as a "mudfighter", the AU-1 would operate at low altitudes and so a two-stage supercharger or turbocharger system was regarded as unnecessary. The engine was oriented at two degrees below the centerline, just like in the F4U-5, but the two cheek inlets were moved to under the belly, to ensure better armor protection.
One particularly noticeable change in the AU-1 was that the four stub pylons for HVARs under each wing were switched to five small stores pylons, either for HVARs or light bombs. Total warload of the AU-1 was a respectable 1,815 kilograms (4,000 pounds). Armament of four M3 cannon, with a total of 924 rounds of ammunition, was retained. Roughly 111 AU-1s were built in all, with the type going into service with the US Marine Corps in Korea in 1952.
During the Korean War, the Corsair was used mostly in the close-support role. There were dogfights between F4Us and enemy Yak-9 fighters early in the conflict, but when the enemy introduced the fast MiG-15 jet fighter the Corsair was outmatched, though one Marine pilot did get lucky. On 9 September 1952 a MiG-15 made the mistake of getting into a turning contest with a Corsair piloted by Captain Jesse G. Folmar, with Folmar shooting the MiG down with his cannon. The MiG's wingmates quickly had their revenge, shooting down Folmar, though he bailed out and was quickly rescued with little injury.
Corsair night fighters were used to an extent. The enemy adopted the tactic of using low-and-slow intruders to perform night harassment strikes on American forces, and jet-powered night fighters found catching these "Bedcheck Charlies" troublesome. US Navy F4U-5Ns were posted to shore bases to hunt them down, with US Navy Lieutenant Guy Pierre Bordelon JR becoming an ace, apparently the Navy's only ace in the conflict. "Lucky Pierre" was credited with six kills, including five Yak-9s and one La-9.
More generally, Corsairs performed attacks with cannon, napalm tanks, various iron bombs, and unguided rockets. The old HVAR was a reliable standby, though since sturdy Soviet-built armor proved resistant to the HVAR's punch, a new 16.5 centimeter (6.5 inch) hollow-charge antitank warhead was developed for the HVAR, with the result named the "Anti-Tank Aircraft Rocket (ATAR)". The big Tiny Tim rocket was also used in combat. There is a story of a Corsair pilot who cut enemy communications lines by snagging them with his arresting hook.
 F4U-7 / CORSAIR IN INDOCHINA / TWILIGHT
The very last production Corsair was the "F4U-7", which was built specifically for the French naval air arm, the Aeronavale. It was something of an odd hybrid variant, with the R-2800-18W Double Wasp and inlets in the lower lip of the cowling of the F4U-4, the downward-sloping engine installation of the F4U-5, and the five small stores pylons under each wing of the AU-1. It lacked the heavy armor protection of the AU-1.
Initial flight of the F4U-7 was on 2 July 1952. A total of 94 F4U-7s was built for the Aeronavale in 1952, with the last of the batch, the final Corsair built, rolled out in December 1952. The F4U-7s were actually purchased by the US Navy and passed on to the Aeronavale through the US Military Assistance Program (MAP). The French used their F4U-7s during their bitter little war in Indochina in the mid-1950s, where they were supplemented by at least 25 ex-USMC UA-1s passed on to the French in 1954, after the end of the Korean War.
French Corsairs also performed strikes in the Algerian conflict in 1955 and 1956, and assisted in the Anglo-French-Israeli seizure of the Suez Canal in October 1956, codenamed Operation MUSKETEER. The Corsairs were painted with yellow and black recognition stripes for this operation. In 1960, some French Corsairs were rigged to carry four SS-11 wire-guided missiles. This was a more or less experimental fit and it is hard to believe it worked well, since it required a pilot to "fly" the missile after launch with a joystick while keeping track of a flare on its tail -- an exercise that might be very tricky in a single-seat aircraft under combat conditions. All French Corsairs were out of service by 1964, with some surviving for museum display or as civilian warbirds.
The F4U was finally phased out of USMC and US Navy reserve service in the mid-1950s. The Corsair remained in military service in Latin America, with the type provided to the Argentine Navy, the air forces of Honduras and El Salvador, and possibly a few other Latin American air arms. This led to combat between the Corsairs during the short-lived "Soccer War" between Honduras and El Salvador in July 1969. The conflict was famously triggered, though not really caused, by a disagreement over a football match. Both sides claimed various numbers of kills, and predictably each side disputed the claims of the other.
The Corsair also went back to air racing with the revival of such events in the late 1960s, and significantly played a starring role in the popular TV series BAA BAA BLACK SHEEP, which ran from 1976 through 1978 and featured tough-guy actor Robert Conrad -- previously star of the popular 1960s WILD WILD WEST series -- playing Pappy Boyington, as well as a number of very fine F4U warbirds. The show did do much to promote Boyington's legend. He had fallen on hard times after the war, the booze getting the better of him for a time, but he had dried out and was used as a consultant on the TV series, though it was hardly noted for its authenticity.
When Boyington met Conrad, Boyington told the actor that he wished he, Boyington, were younger. When Conrad asked why, Boyington replied that he wanted to beat Conrad's cocky ass. It would have been another interesting match, neither man being a pushover by any means. Boyington died in 1988 and was buried in Arlington National Cemetery, having gone from hero to drunken bum and then back to hero again. The F4U survives in a large number of static displays and a few crowd-pleasing flying Corsair "warbirds" as a memorial to Boyington and other Corsair pilots.
 CORSAIR PRODUCTION SUMMARY
The following table summarizes Corsair variants and production. Figures tend to vary from source to source and, exasperatingly, don't always even add up within sources. Sources are particularly confused on the total numbers of F4U-1As and F4U-1Ds. However, overall the quantities given here can be regarded as being in the ballpark.
CORSAIR PRODUCTION SUMMARY:
Variant: Built - Comments
XF4U-1 1 Initial prototype.
F4U-1 688 Initial production model.
F4U-1A 2,126 F4U-1 with improved canopy, other changes.
F4U-1C 200 F4U-1A with quad 20 millimeter cannon.
F4U-1D 1,685 Fighter-bomber variant.
F4U-1P - Field reconnaissance conversion of F4U-1.
4,699 subtotal F4U-1 production
F4U-2 - 32 (12?) night-fighter conversions of F4U-1.
F4U-3 - Turbocharged Double Wasp, 3 conversions.
F4U-4 2,058 Four bladed prop, other improvements.
F4U-4B 297 F4U-4 with quad cannon.
F4U-4N 1 F4U-4 night fighter.
F4U-4P 9 Reconnaissance version of F4U-4.
F4U-5 223 Four cannon, uprated engine, etc.
F4U-5N 214 F4U-5 night fighter.
F4U-5NL 101 Winterized F4U-5 night fighter.
F4U-5P 30 Reconnaissance version of F4U-5.
AU-1 111 USMC armored close-support "mudfighter".
F4U-7 97 French Aeronavale Corsair production.
3,448 subtotal other Vought production
8,148 TOTAL VOUGHT PRODUCTION
FG-1 ? Goodyear-built F4U-1, nonfolding wings.
FG-1A ? Goodyear-built F4U-1A.
FG-1D 1,997 Goodyear-built F4U-1D.
3,808 subtotal Goodyear FG-1 production.
FG-4 12 Goodyear-built F4U-4.
XF2G - Prototypes (conversions of FG-1) for F2G.
F2G-1 5 Land-based Corsair with Wasp Major.
F2G-2 5 Carrier-based Corsair with Wasp Major, 4 cannon.
3,830 TOTAL GOODYEAR PRODUCTION
F3A-1 305 Brewster-built F4U-1.
F3A-1D 430 Brewster F4U-1D.
735 TOTAL BREWSTER PRODUCTION
This gives total Corsair production of 12,713. However, total Corsair production is given in most sources as 12,571 aircraft. It can be said in general that over 12,000 Corsairs were built.
 COMMENTS & SOURCES
I always get a few surprises when I decide to write up an aircraft. The Corsair turned out to be surprisingly easy to document, which was a relief because writing a document on an aircraft more generally turns out to be more work than I expect. Another surprise, a less pleasant one, were the sometimes wild discrepancies between sources. This writeup gave me another lesson in the truth that history is less about the past than it is about records of the past.
Since my research is basically sitting in front of a computer and paging through books and magazines, it can be difficult sort out the facts. Sometimes it's straightforward, though. One source, not credited below, claimed that British Corsairs participated in the 1956 Suez operation, but this appears to have been confusion with Aeronavale Corsairs -- the British had given up their last Corsairs a decade earlier. This source also gave the date of MUSKETEER as 1954, suggesting the author was having a really bad day.
F4U CORSAIR by Frederick A. Johnsen, included in THE GREAT BOOK OF WORLD WAR II AIRPLANES, Bonanza Books, 1984.
F4U CORSAIR IN ACTION by Jim Sullivan, Squadron-Signal Publications, 1994.
THE COMPLETE BOOK OF FIGHTERS by William Green & Gordon Swanborough, Salamander Books, 1994.
AMERICAN WARPLANES OF WORLD WAR II, edited by David Donald, Aerospace Publishing LTD, 1995.
BRITISH WARPLANES OF WORLD WAR II, edited by Daniel J. March, Aerospace Publishing LTD, 1998.