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North American P-51 Mustang
American WWII-era fighter aircraft
P-51D of 375th Fighter Squadron, with underwing drop tanks
The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The Mustang was designed in April 1940 by a design team headed by James Kindelberger of North American Aviation (NAA) in response to a requirement of the British Purchasing Commission. The Purchasing Commission approached North American Aviation to build Curtiss P-40 fighters under license for the Royal Air Force (RAF). Rather than build an old design from another company, North American Aviation proposed the design and production of a more modern fighter. The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed, and first flew on 26 October.
At the start of the Korean War, the Mustang, by then redesignated F-51, was the main fighter of the United States until jet fighters, including North American's F-86, took over this role; the Mustang then became a specialized fighter-bomber. Despite the advent of jet fighters, the Mustang remained in service with some air forces until the early 1980s. After the Korean War, Mustangs became popular civilian warbirds and air racing aircraft.
Design and development
North American NA-73X, with a short carburetor air intake scoop and the frameless, rounded windshield: On the production Mustang Mk Is, the frameless windshield was replaced with a three-piece unit that incorporated a bullet-resistant windshield.
P-51D on the Inglewood assembly line
In 1938, the British government established a purchasing commission in the United States, headed by Sir Henry Self. Self was given overall responsibility for Royal Air Force (RAF) production, research and development, and also served with Sir Wilfrid Freeman, the Air Member for Development and Production. Self also sat on the British Air Council Sub-committee on Supply (or "Supply Committee") and one of his tasks was to organize the manufacturing and supply of American fighter aircraft for the RAF. At the time, the choice was very limited, as no U.S. aircraft then in production or flying met European standards, with only the Curtiss P-40 Tomahawk coming close. The Curtiss-Wright plant was running at capacity, so P-40s were in short supply.
John Attwood of North American spent much time from January to April 1940 at the British Purchasing Commission's offices in New York discussing the British specifications of the proposed airplane with British engineers. The discussions consisted of free hand conceptual drawings of an airplane with the British officials. Sir Henry Self was concerned that North American had not ever designed a fighter, insisting they obtain the drawings and study the Curtiss XP-46 experimental aircraft and the wind tunnel test results for the P-40, before presenting them with detailed design drawings based on the agreed concept. North American purchased the drawings and data from Curtiss for £56,000, confirming the purchase with the Purchasing Commission. The Purchasing Commission approved the resulting detailed design drawings, signing the commencement of the Mustang project on 4 May 1940, firmly ordering 320 airplanes on 29 May 1940. Prior to this North American only had a draft letter for an order of 320 aircraft. Curtiss engineers accused North American of plagiarism.
The British Purchasing Commission stipulated armament of four .303 in (7.7 mm) machine guns (as used on the Tomahawk), a unit cost of no more than $40,000 and delivery of the first production aircraft by January 1941. In March 1940, 320 aircraft were ordered by Freeman, who had become the executive head of the Ministry of Aircraft Production (MAP) and the contract was promulgated on 24 April.
The NA-73X, which was designed by a team led by lead engineer Edgar Schmued, followed the best conventional practice of the era, designed for ease of mass manufacturing. The design included several new features.[nb 2] One was a wing designed using laminar flow airfoils, which were developed co-operatively by North American Aviation and the National Advisory Committee for Aeronautics (NACA). These airfoils generated low drag at high speeds. During the development of the NA-73X, a wind tunnel test of two wings, one using NACA five-digit airfoils and the other using the new NAA/NACA 45-100 airfoils, was performed in the University of Washington Kirsten Wind Tunnel. The results of this test showed the superiority of the wing designed with the NAA/NACA 45-100 airfoils.[nb 3]
XP-51 41-039, one of two Mustang Mk I aircraft handed over to the USAAC for testing
The other feature was a new cooling arrangement positioned aft (single ducted water and oil radiators assembly) that reduced the fuselage drag and effects on the wing. Later, after much development, they discovered that the cooling assembly could take advantage of the Meredith effect: in which heated air exited the radiator with a slight amount of jet thrust. Because NAA lacked a suitable wind tunnel to test this feature, it used the GALCIT 3.0 m (10 ft) wind tunnel at the California Institute of Technology. This led to some controversy over whether the Mustang's cooling system aerodynamics were developed by NAA's engineer Edgar Schmued or by Curtiss, as NAA had purchased the complete set of P-40 and XP-46 wind tunnel data and flight test reports. The NA-73X was also one of the first aircraft to have a fuselage lofted mathematically using conic sections; this resulted in smooth, low drag surfaces. To aid production, the airframe was divided into five main sections--forward, center, rear fuselage, and two wing halves--all of which were fitted with wiring and piping before being joined.
The prototype NA-73X was rolled out in September 1940, just 102 days after the order had been placed; it first flew on 26 October 1940, 149 days into the contract, an uncommonly short development period, even during the war. With test pilot Vance Breese at the controls, the prototype handled well and accommodated an impressive fuel load. The aircraft's three-section, semi-monocoque fuselage was constructed entirely of aluminum to save weight. It was armed with four .30 caliber (7.62 mm) AN/M2 Browning machine guns in the wings and two .50 caliber (12.7 mm) AN/M2 Browning machine guns mounted under the engine and firing through the propeller arc using gun-synchronizing gear.[nb 4]
While the United States Army Air Corps could block any sales it considered detrimental to the interests of the US, the NA-73 was considered to be a special case because it had been designed at the behest of the British. In September 1940, a further 300 NA-73s were ordered by the MAP. To ensure uninterrupted delivery, Colonel Oliver P. Echols arranged with the Anglo-French Purchasing Commission to deliver the aircraft and NAA gave two examples (41-038 and 41-039) to the USAAC for evaluation.[nb 5]
The Allison engine in the Mustang I had a single-stage supercharger that caused power to drop off rapidly above 15,000 feet (4,600 m). This made it unsuitable for use at the altitudes where combat was taking place in Europe. Allison's attempts at developing a high-altitude engine were under-funded, but produced the V-1710-45, which featured a variable-speed auxiliary supercharger, and developed 1,150 horsepower (860 kW) at 22,400 feet (6,800 m). In November 1941 NAA studied the possibility of using it, but fitting its excessive length in the Mustang would require extensive airframe modifications and cause long production delays. In May 1942, following positive reports from the RAF on the Mustang I's performance below 15,000 ft, Ronald Harker, a test pilot for Rolls-Royce, suggested fitting a Merlin 61, as fitted to the Spitfire Mk IX. The Merlin 61 had a two-speed, two-stage, intercooled supercharger, designed by Stanley Hooker of Rolls-Royce. Both the Merlin 61 and V-1710-39 were capable of ~1,570 horsepower (1,170 kW) War Emergency Power at relatively low altitude, but the Merlin developed 1,390 horsepower (1,040 kW) at 23,500 feet (7,200 m) versus the Allison's 1,150 horsepower (860 kW) at 11,800 feet (3,600 m), delivering an increase in top speed from 390 mph (340 kn; 630 km/h) at ~15,000 feet (4,600 m) to an estimated 440 mph (380 kn; 710 km/h) at 28,100 feet (8,600 m). Initial flights of what was known to Rolls-Royce as the Mustang Mk X were completed at Rolls-Royce's airfield at Hucknall in October 1942.
At the same time, the possibility of combining the P-51 airframe with the US license-built Packard version of the Merlin engine was being explored on the other side of the Atlantic. In July 1942 a contract was let for two prototypes, briefly designated XP-78 but soon to become the XP-51B. Based on the Packard V-1650-3 duplicating the Merlin 61's performance, NAA estimated for the XP-78 a top speed of 445 mph (387 kn; 716 km/h) at 28,000 feet (8,500 m), and a service ceiling of 42,000 feet (13,000 m). The first flight of the XP-51B took place in November 1942, but the USAAF was so interested in the possibility that an initial contract for 400 aircraft was placed three months beforehand in August. The conversion led to production of the P-51B beginning at North American's Inglewood, California, plant in June 1943, and P-51s started to become available to the 8th and 9th Air Forces in the winter of 1943-1944. Conversion to the two-stage supercharged Merlin 61, over 350 lb (160 kg) heavier than the single-stage Allison, driving a four-bladed Hamilton Standard propeller, required moving the wing slightly forward to correct the aircraft's center-of-gravity. After the USAAF in July 1943 directed fighter aircraft manufacturers to maximize internal fuel capacity, NAA calculated the P-51B's center of gravity to be forward enough to include an additional 85 US gal (320 l; 71 imp gal) fuel tank in the fuselage behind the pilot, greatly increasing the aircraft's range over that of the earlier P-51A. NAA incorporated the tank in production of the P-51B-10, and supplied kits to retrofit it to all existing P-51Bs.
United Kingdom operational service
A Royal Air Force North American Mustang Mk III (FX908) on the ground at Hucknall
The Mustang was initially developed for the RAF, which was its first user. As the first Mustangs were built to British requirements, these aircraft used factory numbers and were not P-51s; the order comprised 320 NA-73s, followed by 300 NA-83s, all of which were designated North American Mustang Mark I by the RAF. The first RAF Mustangs supplied under Lend-Lease were 93 P-51s, designated Mk Ia, followed by 50 P-51As used as Mustang Mk IIs. Aircraft supplied to Britain under Lend-Lease were required for accounting purposes to be on the USAAC's books before they could be supplied to Britain. However, the British Aircraft Purchasing Commission signed its first contract for the North American NA-73 on 24 April 1940, before Lend-Lease was in effect. Thus, the initial order for the P-51 Mustang (as it was later known) was placed by the British under the "Cash and Carry" program, as required by the US Neutrality Acts of the 1930s.
After the arrival of the initial aircraft in the UK in October 1941, the first Mustang Mk Is entered service in January 1942, the first unit being 26 Squadron RAF. Due to poor high-altitude performance, the Mustangs were used by Army Co-operation Command, rather than Fighter Command, and were used for tactical reconnaissance and ground-attack duties. On 10 May 1942, Mustangs first flew over France, near Berck-sur-Mer. On 27 July 1942, 16 RAF Mustangs undertook their first long-range reconnaissance mission over Germany. During the amphibious Dieppe Raid on the French coast (19 August 1942), four British and Canadian Mustang squadrons, including 26 Squadron, saw action covering the assault on the ground. By 1943-1944, British Mustangs were used extensively to seek out V-1 flying bomb sites. The last RAF Mustang Mk I and Mustang Mk II aircraft were struck off charge in 1945.
Army Co-operation Command used the Mustang's superior speed and long range to conduct low altitude "Rhubarb" raids over continental Europe, sometimes penetrating German airspace. The V-1710 engine ran smoothly at 1,100 rpm, versus 1,600 for the Merlin, enabling long flights over water at 50 ft altitude before approaching the enemy coastline. Over land these flights followed a zig-zag course, turning every six minutes to foil enemy attempts at plotting an interception. During the first 18 months of Rhubarb raids, RAF Mustang Mk.Is and Mk.Ias destroyed or heavily damaged 200 locomotives, over 200 canal barges, and an unknown number of enemy aircraft parked on the ground, for a loss of eight Mustangs. At sea level the Mustangs were able to outrun all enemy aircraft encountered. The RAF gained a significant performance enhancement at low altitude by removing or resetting the engine's manifold pressure regulator to allow over-boosting, raising output as high as 1,780 horsepower at 70" Hg. In December 1942, Allison approved only 1,570 horsepower at 60" Hg manifold pressure for the V-1710-39.
The RAF also operated 308 P-51Bs and 636 P-51Cs, which were known in RAF service as Mustang Mk IIIs; the first units converted to the type in late 1943 and early 1944. Mustang Mk III units were operational until the end of World War II, though many units had already converted to the Mustang Mk IV (P-51D) and Mk IVa (P-51K) (828 in total, comprising 282 Mk IV and 600 Mk IVa). As all except the earliest aircraft were obtained under Lend-Lease, all Mustang aircraft still on RAF charge at the end of the war were either returned to the USAAF "on paper" or retained by the RAF for scrapping. The last RAF Mustangs were retired from service in 1947.
The 8th Air Force started operations from Britain in August 1942. At first, because of the limited scale of operations, no conclusive evidence showed American doctrine was failing. In the 26 operations flown to the end of 1942, the loss rate had been under 2%.
In January 1943, at the Casablanca Conference, the Allies formulated the Combined Bomber Offensive (CBO) plan for "round-the-clock" bombing - USAAF daytime operations complementing the RAF nighttime raids on industrial centers. In June 1943, the Combined Chiefs of Staff issued the Pointblank Directive to destroy the Luftwaffe's capacity before the planned invasion of Europe, putting the CBO into full implementation. German daytime fighter efforts were, at that time, focused on the Eastern Front and several other distant locations. Initial efforts by the 8th met limited and unorganized resistance, but with every mission, the Luftwaffe moved more aircraft to the west and quickly improved their battle direction. In fall 1943, the 8th Air Force's heavy bombers conducted a series of deep-penetration raids into Germany, beyond the range of escort fighters. The Schweinfurt-Regensburg mission in August lost 60 B-17s of a force of 376, the 14 October attack lost 77 of a force of 291--26% of the attacking force.
For the US, the very concept of self-defending bombers was called into question, but instead of abandoning daylight raids and turning to night bombing, as the RAF suggested, they chose other paths; at first, a bomber with more guns (the Boeing YB-40) was believed to be able to escort the bomber formations, but when the concept proved to be unsuccessful, thoughts then turned to the Lockheed P-38 Lightning. In early 1943, the USAAF also decided that the Republic P-47 Thunderbolt and P-51B be considered for the role of a smaller escort fighter, and in July, a report stated that the P-51B was "the most promising plane" with an endurance of 4 hours 45 minutes with the standard internal fuel of 184 gallons plus 150 gallons carried externally. In August, a P-51B was fitted with an extra internal 85-gallon tank, and although problems with longitudinal stability occurred and some compromises in performance with the tank full were made, and because the fuel from the fuselage tank would be used during the initial stages of a mission, the fuel tank would be fitted in all Mustangs destined for VIII Fighter Command.
The P-51 Mustang was a solution to the need for an effective bomber escort. It used a common, reliable engine and had internal space for a larger-than-average fuel load. With external fuel tanks, it could accompany the bombers from England to Germany and back.
By the time the Pointblank offensive resumed in early 1944, matters had changed. Bomber escort defenses were initially layered, using the shorter-range P-38s and P-47s to escort the bombers during the initial stages of the raid before handing over to the P-51s when they were forced to turn for home. This provided continuous coverage during the raid. The Mustang was so clearly superior to earlier US designs that the 8th Air Force began to steadily switch its fighter groups to the Mustang, first swapping arriving P-47 groups to the 9th Air Force in exchange for those that were using P-51s, then gradually converting its Thunderbolt and Lightning groups. By the end of 1944, 14 of its 15 groups flew the Mustang.
The Luftwaffe's twin-engined Messerschmitt Bf 110 heavy fighters brought up to deal with the bombers proved to be easy prey for the Mustangs, and had to be quickly withdrawn from combat. The Focke-Wulf Fw 190A, already suffering from poor high-altitude performance, was outperformed by the Mustang at the B-17's altitude, and when laden with heavy bomber-hunting weapons as a replacement for the more vulnerable twin-engined Zerstörer heavy fighters, it suffered heavy losses. The Messerschmitt Bf 109 had comparable performance at high altitudes, but its lightweight airframe was even more greatly affected by increases in armament. The Mustang's much lighter armament, tuned for antifighter combat, allowed it to overcome these single-engined opponents.
At the start of 1944, Major General James Doolittle, the new commander of the 8th Air Force, ordered many fighter pilots to stop flying in formation with the bombers and instead attack the Luftwaffe wherever it could be found. The aim was to achieve air supremacy. Mustang groups were sent far ahead of the bombers in a "fighter sweep" in order to intercept attacking German fighters.
The Luftwaffe answered with the Gefechtsverband ("battle formation"). This consisted of a Sturmgruppe of heavily armed and armored Fw 190 As escorted by two Begleitgruppen of Messerschmitt Bf 109s, whose task was to keep the Mustangs away from the Fw 190 as they attacked the bombers. This strategy proved to be problematic, as the large German formation took a long time to assemble and was difficult to maneuver. It was often intercepted by the P-51 "fighter sweeps" before it could attack the bombers. However, German attacks against bombers could be effective when they did occur; the bomber-destroyer Fw 190As swept in from astern and often pressed their attacks to within 90 m (100 yd).
A USAAF armorer of the 100th Fighter Squadron, 332nd Fighter Group, 15th U.S. Air Force checks ammunition belts of the .50 caliber (12.7 mm) Browning machine guns in the wings of a North American P-51B Mustang in Italy, circa September 1944
While not always able to avoid contact with the escorts, the threat of mass attacks and later the "company front" (eight abreast) assaults by armored Sturmgruppe Fw 190As brought an urgency to attacking the Luftwaffe wherever it could be found, either in the air or on the ground. Beginning in late February 1944, 8th Air Force fighter units began systematic strafing attacks on German airfields with increasing frequency and intensity throughout the spring, with the objective of gaining air supremacy over the Normandy battlefield. In general these were conducted by units returning from escort missions but, beginning in March, many groups also were assigned airfield attacks instead of bomber support. The P-51, particularly with the advent of the K-14 Gyro gunsight and the development of "Clobber Colleges" for the training of fighter pilots in fall 1944, was a decisive element in Allied countermeasures against the Jagdverbände.
The numerical superiority of the USAAF fighters, superb flying characteristics of the P-51, and pilot proficiency helped cripple the Luftwaffe's fighter force. As a result, the fighter threat to US, and later British, bombers was greatly diminished by July 1944. The RAF, long proponents of night bombing for protection, were able to reopen daylight bombing in 1944 as a result of the crippling of the Luftwaffe fighter arm. ReichsmarschallHermann Göring, commander of the German Luftwaffe during the war, was quoted as saying, "When I saw Mustangs over Berlin, I knew the jig was up."
P-51D 44-14888 of the 8th AF/357th FG/363rd FS, named Glamorous Glen III, is the aircraft in which Chuck Yeager achieved most of his 12.5 kills, including two Me 262s - shown here with twin single-use 108-gallon (409-l) drop tanks fitted. This aircraft was renamed "Melody's Answer" and crashed on Mar 2, 1945, from unknown causes at Haseloff, West of Treuenbrietzen, Germany
Top-scoring Mustang ace of WWII, Major George Earl Preddy Jr. with 26.83 aerial victories and 5 aircraft destroyed on the ground (first 3 victories were achieved on P-47)
On 15 April 1944, VIII Fighter Command began "Operation Jackpot", attacks on Luftwaffe fighter airfields. As the efficacy of these missions increased, the number of fighters at the German airbases fell to the point where they were no longer considered worthwhile targets. On 21 May, targets were expanded to include railways, locomotives, and rolling stock used by the Germans to transport materiel and troops, in missions dubbed "Chattanooga". The P-51 excelled at this mission, although losses were much higher on strafing missions than in air-to-air combat, partially because the Mustang's liquid-cooled engine (particularly its coolant system) was vulnerable to small-arms fire, unlike the air-cooled R-2800 radials of its Republic P-47 Thunderbolt stablemates based in England, regularly tasked with ground-strafing missions.
P-51D Mustang Detroit Miss of the 375th Fighter Squadron: Urban L. Drew flew this aircraft in the autumn 1944 and shot down six German aircraft, including two jet-powered Me 262s in a single mission.
Given the overwhelming Allied air superiority, the Luftwaffe put its effort into the development of aircraft of such high performance that they could operate with impunity, but which also made bomber attack much more difficult, merely from the flight velocities they achieved. Foremost among these were the Messerschmitt Me 163B point-defense rocket interceptors, which started their operations with JG 400 near the end of July 1944, and the longer-endurance Messerschmitt Me 262A jet fighter, first flying with the Gruppe-strength Kommando Nowotny unit by the end of September 1944. In action, the Me 163 proved to be more dangerous to the Luftwaffe than to the Allies, and was never a serious threat. The Me 262A was a serious threat, but attacks on their airfields neutralized them. The pioneering Junkers Jumo 004axial-flowjet engines of the Me 262As needed careful nursing by their pilots, and these aircraft were particularly vulnerable during takeoff and landing. Lt. Chuck Yeager of the 357th Fighter Group was one of the first American pilots to shoot down an Me 262, which he caught during its landing approach. On 7 October 1944, Lt. Urban L. Drew of the 361st Fighter Group shot down two Me 262s that were taking off, while on the same day Lt. Col. Hubert Zemke, who had transferred to the Mustang-equipped 479th Fighter Group, shot down what he thought was a Bf 109, only to have his gun camera film reveal that it may have been an Me 262. On 25 February 1945, Mustangs of the 55th Fighter Group surprised an entire Staffel of Me 262As at takeoff and destroyed six jets.
The Mustang also proved useful against the V-1s launched toward London. P-51B/Cs using 150-octane fuel were fast enough to catch the V-1 and operated in concert with shorter-range aircraft such as advanced marks of the Supermarine Spitfire and Hawker Tempest.
By 8 May 1945, the 8th, 9th, and 15th Air Force's P-51 groups [nb 6] claimed some 4,950 aircraft shot down (about half of all USAAF claims in the European theater, the most claimed by any Allied fighter in air-to-air combat) and 4,131 destroyed on the ground. Losses were about 2,520 aircraft. The 8th Air Force's 4th Fighter Group was the top-scoring fighter group in Europe, with 1,016 enemy aircraft claimed destroyed. This included 550 claimed in aerial combat and 466 on the ground.
In air combat, the top-scoring P-51 units (both of which exclusively flew Mustangs) were the 357th Fighter Group of the 8th Air Force with 565 air-to-air combat victories and the 9th Air Force's 354th Fighter Group with 664, which made it one of the top-scoring fighter groups. The top Mustang ace was the USAAF's George Preddy, whose final tally stood at 26.83 victories (a number that includes shared one half- and one third victory credits), 23 of which were scored with the P-51. Preddy was shot down and killed by friendly fire on Christmas Day 1944 during the Battle of the Bulge.
The P-51 was a relative latecomer to the Pacific Theater, due largely to the need for the aircraft in Europe, although the P-38's twin-engined design was considered a safety advantage for long, over-water flights. The first P-51s were deployed in the Far East later in 1944, operating in close-support and escort missions, as well as tactical photo reconnaissance. As the war in Europe wound down, the P-51 became more common; eventually, with the capture of Iwo Jima, it was able to be used as a bomber escort during Boeing B-29 Superfortress missions against the Japanese homeland.
The P-51 was often mistaken for the Japanese Kawasaki Ki-61Hien in both China and Pacific because of its similar appearance.
Chief Naval Test Pilot and C.O. Captured Enemy Aircraft Flight Capt. Eric Brown, CBE, DSC, AFC, RN, tested the Mustang at RAE Farnborough in March 1944 and noted, "The Mustang was a good fighter and the best escort due to its incredible range, make no mistake about it. It was also the best American dogfighter. But the laminar-flow wing fitted to the Mustang could be a little tricky. It could not by any means out-turn a Spitfire. No way. It had a good rate-of-roll, better than the Spitfire, so I would say the plusses to the Spitfire and the Mustang just about equate. If I were in a dogfight, I'd prefer to be flying the Spitfire. The problem was I wouldn't like to be in a dogfight near Berlin, because I could never get home to Britain in a Spitfire!"
The U.S. Air Forces, Flight Test Engineering, assessed the Mustang B on 24 April 1944 thus: "The rate of climb is good and the high speed in level flight is exceptionally good at all altitudes, from sea level to 40,000 feet. The airplane is very maneuverable with good controllability at indicated speeds up to 400 MPH [sic]. The stability about all axes is good and the rate of roll is excellent; however, the radius of turn is fairly large for a fighter. The cockpit layout is excellent, but visibility is poor on the ground and only fair in level flight."
Kurt Bühligen, the third-highest scoring German fighter pilot of World War II's Western Front (with 112 confirmed victories, three against Mustangs), later stated, "We would out-turn the P-51 and the other American fighters, with the Bf 109 or the Fw 190. Their turn rate was about the same. The P-51 was faster than us, but our munitions and cannon were better."Heinz Bär said that the P-51 "was perhaps the most difficult of all Allied aircraft to meet in combat. It was fast, maneuverable, hard to see, and difficult to identify because it resembled the Me 109".
In the aftermath of World War II, the USAAF consolidated much of its wartime combat force and selected the P-51 as a "standard" piston-engined fighter, while other types, such as the P-38 and P-47, were withdrawn or given substantially reduced roles. As the more advanced (P-80 and P-84) jet fighters were introduced, the P-51 was also relegated to secondary duties.
In 1947, the newly formed USAFStrategic Air Command employed Mustangs alongside F-6 Mustangs and F-82 Twin Mustangs, due to their range capabilities. In 1948, the designation P-51 (P for pursuit) was changed to F-51 (F for fighter) and the existing F designator for photographic reconnaissance aircraft was dropped because of a new designation scheme throughout the USAF. Aircraft still in service in the USAF or Air National Guard (ANG) when the system was changed included: F-51B, F-51D, F-51K, RF-51D (formerly F-6D), RF-51K (formerly F-6K) and TRF-51D (two-seat trainer conversions of F-6Ds). They remained in service from 1946 through 1951. By 1950, although Mustangs continued in service with the USAF after the war, the majority of the USAF's Mustangs had become surplus to requirements and placed in storage, while some were transferred to the Air Force Reserve and the ANG.
An F-51 Mustang, laden with bombs and rockets, taxis through a puddle at an airbase in Korea.
From the start of the Korean War, the Mustang once again proved useful. A "substantial number" of stored or in-service F-51Ds were shipped, via aircraft carriers, to the combat zone, and were used by the USAF, the South African Air Force, and the Republic of Korea Air Force (ROKAF). The F-51 was used for ground attack, fitted with rockets and bombs, and photo reconnaissance, rather than being as interceptors or "pure" fighters. After the first North Korean invasion, USAF units were forced to fly from bases in Japan and the F-51Ds, with their long range and endurance, could attack targets in Korea that short-ranged F-80 jets could not. Because of the vulnerable liquid cooling system, however, the F-51s sustained heavy losses to ground fire. Due to its lighter structure and a shortage of spare parts, the newer, faster F-51H was not used in Korea.
West Virginia Air National Guard F-51D. Note: postwar "uncuffed" propeller unit.
The final withdrawal of the Mustang from USAF dumped hundreds of P-51s onto the civilian market. The rights to the Mustang design were purchased from North American by the Cavalier Aircraft Corporation, which attempted to market the surplus Mustang aircraft in the U.S. and overseas. In 1967 and again in 1972, the USAF procured batches of remanufactured Mustangs from Cavalier, most of them destined for air forces in South America and Asia that were participating in the Military Assistance Program (MAP). These aircraft were remanufactured from existing original F-51D airframes fitted with new V-1650-7 engines, a new radio, tall F-51H-type vertical tails, and a stronger wing that could carry six 13 mm (0.50 in) machine guns and a total of eight underwing hardpoints. Two 1,000-pound (450 kg) bombs and six 130 mm (5 in) rockets could be carried. They all had an original F-51D-type canopy, but carried a second seat for an observer behind the pilot. One additional Mustang was a two-seat, dual-control TF-51D (67-14866) with an enlarged canopy and only four wing guns. Although these remanufactured Mustangs were intended for sale to South American and Asian nations through the MAP, they were delivered to the USAF with full USAF markings. They were, however, allocated new serial numbers (67-14862/14866, 67-22579/22582 and 72-1526/1541).
The last U.S. military use of the F-51 was in 1968, when the U. S. Army employed a vintage F-51D (44-72990) as a chase aircraft for the Lockheed YAH-56 Cheyenne armed helicopter project. This aircraft was so successful that the Army ordered two F-51Ds from Cavalier in 1968 for use at Fort Rucker as chase planes. They were assigned the serials 68-15795 and 68-15796. These F-51s had wingtip fuel tanks and were unarmed. Following the end of the Cheyenne program, these two chase aircraft were used for other projects. One of them (68-15795) was fitted with a 106 mm recoilless rifle for evaluation of the weapon's value in attacking fortified ground targets. Cavalier Mustang 68-15796 survives at the Air Force Armament Museum, Eglin AFB, Florida, displayed indoors in World War II markings.
The F-51 was adopted by many foreign air forces and continued to be an effective fighter into the mid-1980s with smaller air arms. The last Mustang ever downed in battle occurred during Operation Power Pack in the Dominican Republic in 1965, with the last aircraft finally being retired by the Dominican Air Force in 1984.
In November 1944, 3 Squadron RAAF became the first Royal Australian Air Force unit to use Mustangs. At the time of its conversion from the P-40 to the Mustang, the squadron was based in Italy with the RAF's First Tactical Air Force.
3 Squadron was renumbered 4 Squadron after returning to Australia from Italy, and converted to P-51Ds. Several other Australian or Pacific-based squadrons converted to either CAC-built Mustangs or to imported P-51Ks from July 1945, having been equipped with P-40s or Boomerangs for wartime service; these units were: 76, 77, 82, 83, 84 and 86 Squadrons. Only 17 Mustangs reached the RAAF's First Tactical Air Force front-line squadrons by the time World War II ended in August 1945.
Lynn Garrison with RCAF 9281, 1956, subsequently flown during the 1969 Football War, returned to the U.S. by Jerry Janes and flown as Cottonmouth
Canada had five squadrons equipped with Mustangs during World War II. RCAF 400, 414, and 430 squadrons flew Mustang Mk Is (1942-1944) and 441 and 442 Squadrons flew Mustang Mk IIIs and IVAs in 1945. Postwar, a total of 150 Mustang P-51Ds was purchased and served in two regular (416 "Lynx" and 417 "City of Windsor") and six auxiliary fighter squadrons (402 "City of Winnipeg", 403 "City of Calgary", 420 "City of London", 424 "City of Hamilton", 442 "City of Vancouver" and 443 "City of New Westminster"). The Mustangs were declared obsolete in 1956, but a number of special-duty versions served on into the early 1960s.
The Chinese Nationalist Air Force obtained the P-51 during the late Sino-Japanese War to fight against the Japanese. After the war, Chiang Kai-shek's Nationalist government used the planes against insurgent Communist forces. The Nationalists retreated to Taiwan in 1949. Pilots supporting Chiang brought most of the Mustangs with them, where the aircraft became part of the island's defense arsenal.
In November 1958, three US-registered civilian P-51D Mustangs were illegally flown separately from Miami to Cuba, on delivery to the rebel forces of the 26th of July Movement, then headed by Fidel Castro during the Cuban Revolution. One of the Mustangs was damaged during delivery and none of them was used operationally. After the success of the revolution in January 1959, with other rebel aircraft plus those of the existing Cuban government forces, they were adopted into the Fuerza Aérea Revolucionaria. Due to increasing U.S. restrictions and lack of spares and maintenance experience, they never achieved operational status. At the time of the Bay of Pigs invasion, the two intact Mustangs were already effectively grounded at Campo Columbia and at Santiago. After the failed invasion, they were placed on display with other symbols of "revolutionary struggle" and one remains on display at the Museo del Aire.[page needed]
The Dominican Republic was the largest Latin American air force to employ the P-51D, with six aircraft acquired in 1948, 44 ex-Swedish F-51Ds purchased in 1948, and a further Mustang obtained from an unknown source. It was the last nation to have any Mustangs in service, with some remaining in use as late as 1984. Nine of the final 10 aircraft were sold back to American collectors in 1988.
The FAS purchased five Cavalier Mustang IIs (and one dual-control Cavalier TF-51) that featured wingtip fuel tanks to increase combat range and up-rated Merlin engines. Seven P-51D Mustangs were also in service. They were used during the 1969 Football War against Honduras, the last time the P-51 was used in combat. One of them, FAS-404, was shot down by a F4U-5 flown by Cap. Fernando Soto in the last aerial combat between piston-engined fighters in the world.
In late 1944, the first French unit began its transition to reconnaissance Mustangs. In January 1945, the Tactical Reconnaissance Squadron 2/33 of the French Air Force took their F-6Cs and F-6Ds over Germany on photographic mapping missions. The Mustangs remained in service until the early 1950s, when they were replaced by jet fighters.
Several P-51s were captured by the Luftwaffe as Beuteflugzeug ("captured aircraft") following crash landings. These aircraft were subsequently repaired and test-flown by the Zirkus Rosarius, or Rosarius Staffel, the official Erprobungskommando of the Luftwaffe High Command, for combat evaluation at Göttingen. The aircraft were repainted with German markings and bright yellow noses, tails, and bellies for identification. A number of P-51B/P-51Cs - including examples marked with Luftwaffe Geschwaderkennung codes T9+CK, T9+FK, T9+HK, and T9+PK (with the "T9" prefix not known to be officially assigned to any existing Luftwaffe formation from their own records, outside of the photos of Zirkus Rosarius-flown aircraft)--with a total of three captured P-51Ds were also flown by the unit. Some of these P-51s were found by Allied forces at the end of the war; others crashed during testing. The Mustang is also listed in the appendix to the novel KG 200 as having been flown by the German secret operations unit KG 200, which tested, evaluated, and sometimes clandestinely operated captured enemy aircraft during World War II.
Indonesia acquired some P-51Ds from the departing Netherlands East Indies Air Force in 1949 and 1950. The Mustangs were used against Commonwealth (RAF, RAAF, and RNZAF) forces during the Indonesian confrontation in the early 1960s, and was used to fight the CIA-backed PERMESTA rebels. The last time Mustangs were deployed for military purposes was a shipment of six Cavalier II Mustangs (without tip tanks) delivered to Indonesia in 1972-1973, which were replaced in 1976.
A P-51D at the Israeli Air Force Museum: The marking beneath the cockpit notes its participation in the wire-cutting operation at the onset of the Suez Crisis.
A few P-51 Mustangs were illegally bought by Israel in 1948, crated, and smuggled into the country as agricultural equipment for use in the 1947-1949 Palestine war, serving alongside upwards of 23 Avia S-199 fighters (Czech-built Messerschmitt Bf 109Gs) in Israeli service, with the Mustangs quickly establishing themselves as the best fighter in the Israeli inventory. Further aircraft were bought from Sweden and were replaced by jets at the end of the 1950s, but not before the type was used in the Suez Crisis, at the opening of Operation Kadesh. In conjunction with a surprise parachute drop at the Mitla Pass, four P-51s were specially detailed to cut telephone and telegraph wires using their wings in extreme low level runs, which resulted in major interruptions to Egyptian communications.
Italy was a postwar operator of P-51Ds; deliveries were slowed by the Korean War, but between September 1947 and January 1951, by MDAP count, 173 examples were delivered. They were used in all the AMI fighter units: 2, 3, 4, 5, 6 and 51 Stormo (Wing), plus some employed in schools and experimental units. Considered a "glamorous" fighter, P-51s were even used as personal aircraft by several Italian commanders. Some restrictions were placed on its use due to unfavorable flying characteristics. Handling had to be done with much care when fuel tanks were fully used, and several aerobatic maneuvers were forbidden. Overall, the P-51D was highly rated even compared to the other primary postwar fighter in Italian service, the Supermarine Spitfire, partly because these P-51Ds were in very good condition in contrast to all other Allied fighters supplied to Italy. Phasing out of the Mustang began in summer 1958.[page needed]
The P-51C-11-NT Evalina, marked as "278" (former USAAF serial: 44-10816) and flown by 26th FS, 51st FG, was hit by gunfire on 16 January 1945 and belly-landed on Suchon Airfield in China, which was held by the Japanese. The Japanese repaired the aircraft, roughly applied Hinomaruroundels and flew the aircraft to the Fussa evaluation center (now Yokota Air Base) in Japan.
Fuerza Aerea de Nicaragua (GN) purchased 26 P-51D Mustangs from Sweden in 1954 and later received 30 P-51D Mustangs from the U.S. together with two TF-51 models from MAP after 1954. All aircraft of this type were retired from service by 1964.
P-51D in 3 (Canterbury) Squadron TAF livery, performing at 2007 Wings over Wairarapa airshow
New Zealand ordered 370 P-51 Mustangs to supplement its Vought F4U Corsairs in the Pacific Ocean Areas theater. Scheduled deliveries were for an initial batch of 30 P-51Ds, followed by 137 more P-51Ds and 203 P-51Ms. The original 30 were being shipped as the war ended in August 1945; these were stored in their packing cases, and the order for the additional Mustangs was canceled. In 1951, the stored Mustangs entered service in 1 (Auckland), 2 (Wellington), 3 (Canterbury), and 4 (Otago) squadrons of the Territorial Air Force (TAF). The Mustangs remained in service until they were prematurely retired in August 1955 following a series of problems with undercarriage and coolant-system corrosion problems. Four Mustangs served on as target tugs until the TAF was disbanded in 1957. RNZAF pilots in the Royal Air Force also flew the P-51 and at least one New Zealand pilot scored victories over Europe while on loan to a USAAF P-51 squadron.
Philippine Air Force P-51D: The tailwheels were fixed in the extended position.
The Philippines acquired 103 P-51D Mustangs after World War II, operated by the 6th "Cobras" and 7th "Bulldogs" Tactical Fighter Squadrons of the 5th Fighter Wing. These became the backbone of the postwar Philippine Army Air Corps and Philippine Air Force, and were used extensively during the Huk campaign, fighting against Communist insurgents, as well as the suppression of Moro rebels led by Hadji Kamlon in southern Philippines until 1955. The Mustangs were also the first aircraft of the Philippine air demonstration team, which was formed in 1953 and given the name "The Blue Diamonds" the following year. The Mustangs were replaced by 56 F-86 Sabres in the late 1950s, but some were still in service for COIN roles up to the early 1980s.
During World War II, five Polish Air Force in Great Britain squadrons used Mustangs. The first Polish unit equipped (7 June 1942) with Mustang Mk Is was "B" Flight of 309 "Ziemi Czerwie?skiej" Squadron[nb 7] (an Army Co-Operation Command unit), followed by "A" Flight in March 1943. Subsequently, 309 Squadron was redesignated a fighter/reconnaissance unit and became part of Fighter Command. On 13 March 1944, 316 "Warszawski" Squadron received their first Mustang Mk IIIs; rearming of the unit was completed by the end of April. By 26 March 1944, 306 "Toru?ski" Sqn and 315 "D?bli?ski" Sqn received Mustangs Mk IIIs (the whole operation took 12 days). On 20 October 1944, Mustang Mk Is in 309 Squadron were replaced by Mk IIIs. On 11 December 1944, the unit was again renamed, becoming 309 Dywizjon My?liwski "Ziemi Czerwie?skiej" or 309 "Land of Czerwien" Polish Fighter Squadron. In 1945, 303 "Ko?ciuszko" Sqn received 20 Mustangs Mk IV/Mk IVA replacements. Postwar, between 6 December 1946 and 6 January 1947, all five Polish squadrons equipped with Mustangs were disbanded. Poland returned about 80 Mustang Mk IIIs and 20 Mustangs Mk IV/IVAs to the RAF, which transferred them to the U.S. government.[page needed]
North American F-51D Mustang fighters of No. 2 Squadron of the South African Air Force in Korea, on 1 May 1951
No.5 Squadron South African Air Force operated a number of Mustang Mk IIIs (P-51B/C) and Mk IVs (P-51D/K) in Italy during World War II, beginning in September 1944, when the squadron converted to the Mustang Mk III from Kittyhawks. The Mk IV and Mk IVA came into SA service in March 1945. These aircraft were generally camouflaged in the British style, having been drawn from RAF stocks; all carried RAF serial numbers and were struck off charge and scrapped in October 1945. In 1950, 2 Squadron SAAF was supplied with F-51D Mustangs by the United States for Korean War service. The type performed well in South African hands before being replaced by the F-86 Sabre in 1952 and 1953.
Within a month of the outbreak of the Korean War, 10 F-51D Mustangs were provided to the badly depleted Republic of Korea Air Force as a part of the Bout One Project. They were flown by both South Korean airmen, several of whom were veterans of the Imperial Japanese Army and Navy air services during World War II, as well as by U.S. advisers led by Major Dean Hess. Later, more were provided both from U.S. and from South African stocks, as the latter were converting to F-86 Sabres. They formed the backbone of the South Korean Air Force until they were replaced by Sabres.
Sweden's Flygvapnet first recuperated four of the P-51s (two P-51Bs and two early P-51Ds) that had been diverted to Sweden during missions over Europe. In February 1945, Sweden purchased 50 P-51Ds designated J 26, which were delivered by American pilots in April and assigned to the Uppland Air Force Wing (F 16) at Uppsala as interceptors. In early 1946, the Jämtland Air Force Wing (F 4) at Östersund was equipped with a second batch of 90 P-51Ds. A final batch of 21 Mustangs was purchased in 1948. In all, 161 J 26s served in the Swedish Air Force during the late 1940s. About 12 were modified for photo reconnaissance and redesignated S 26. Some of these aircraft participated in the secret Swedish mapping of new Soviet military installations at the Baltic coast in 1946-47 (Operation Falun), an endeavor that entailed many intentional violations of Soviet airspace. However, the Mustang could outdive any Soviet fighter of that era, so no S 26s were lost in these missions. The J 26s were replaced by De Havilland Vampires around 1950. The S 26s were replaced by S 29Cs in the early 1950s.
The Swiss Air Force operated a few USAAF P-51s that had been impounded by Swiss authorities during World War II after the pilots were forced to land in neutral Switzerland. After the war, Switzerland also bought 130 P-51s for $4,000 each. They served until 1958.
The Soviet Union received at least 10 early-model ex-RAF Mustang Mk Is and tested them, but found them to "under-perform" compared to contemporary USSR fighters, relegating them to training units. Later Lend-Lease deliveries of the P-51B/C and D series, along with other Mustangs abandoned in Russia after the famous "shuttle missions", were repaired and used by the Soviet Air Force, but not in front-line service.
The Uruguayan Air Force used 25 P-51D Mustangs from 1950 to 1960; some were subsequently sold to Bolivia.
P-51s and civil aviation
Cavalier P-51 Mustang with tiptanks
Many P-51s were sold as surplus after the war, often for as little as $1,500. Some were sold to former wartime fliers or other aficionados for personal use, while others were modified for air racing.
One of the most significant Mustangs involved in air racing was a surplus P-51C-10-NT (44-10947) purchased by film stunt pilot Paul Mantz. The aircraft was modified by creating a "wet wing", sealing the wing to create a giant fuel tank in each wing, which eliminated the need for fuel stops or drag-inducing drop tanks. This Mustang, named Blaze of Noon after the film Blaze of Noon, came in first in the 1946 and 1947 Bendix Air Races, second in the 1948 Bendix, and third in the 1949 Bendix. He also set a U.S. coast-to-coast record in 1947. The Mantz Mustang was sold to Charles F. Blair Jr (future husband of Maureen O'Hara) and renamed Excalibur III. Blair used it to set a New York-to-London (circa 3,460 miles or 5,570 kilometres) record in 1951: 7 hr 48 min from takeoff at Idlewild to overhead London Airport. Later that same year, he flew from Norway to Fairbanks, Alaska, via the North Pole (circa 3,130 miles or 5,040 kilometres), proving that navigation via sun sights was possible over the magnetic north pole region. For this feat, he was awarded the Harmon Trophy and the Air Force was forced to change its thoughts on a possible Soviet air strike from the north. This Mustang now resides in the National Air and Space Museum at the Steven F. Udvar-Hazy Center.
Miss Helen, a P-51D in its wartime markings as flown by Capt. Raymond H. Littge of the 487 FS, 352 FG, on aerial display in 2007: It is the last original 352 FG P-51 known to exist.
The most prominent firm to convert Mustangs to civilian use was Trans-Florida Aviation, later renamed Cavalier Aircraft Corporation, which produced the Cavalier Mustang. Modifications included a taller tailfin and wingtip tanks. A number of conversions included a Cavalier Mustang specialty: a "tight" second seat added in the space formerly occupied by the military radio and fuselage fuel tank.
In 1958, 78 surviving RCAF Mustangs were retired from service's inventory and were ferried by Lynn Garrison, an RCAF pilot, from their varied storage locations to Canastota, New York, where the American buyers were based. In effect, Garrison flew each of the surviving aircraft at least once. These aircraft make up a large percentage of the aircraft presently flying worldwide.
In the 21st century, a P-51 can command a price of more than $1 million, even for only partially restored aircraft. There were 204 privately owned P-51s in the U.S. on the FAA registry in 2011, most of which are still flying, often associated with organizations such as the Commemorative Air Force (formerly the Confederate Air Force).
The Rebel, a P-51D-25NT, at the 2014 Reno Air Races
In May 2013, Doug Matthews set an altitude record of 12,975 m (42,568 ft) in a P-51 named The Rebel, for piston-powered aircraft weighing 3,000 to 6,000 kg (6,600 to 13,200 lb). Mathews departed from a grass runway at Florida's Indiantown airport and flew The Rebel over Lake Okeechobee. He set world records for time to reach altitudes of 9,000 m (30,000 ft), 18 minutes and 12,000 m (39,000 ft), 31 minutes. He achieved a new height record of 12,200 m (40,100 ft) in level flight and a 13,000 m (42,500 ft) maximum altitude. The previous record of 11,248 m (36,902 ft) had stood since 1954.
Dive-bomber variant of P-51; also known as "Invader" or "Mustang"
Built at Inglewood, California. 93 were Lend-Leased to the UK, operated by RAF as the "Mustang Ia". 57 were retained by the USAAF and fitted with Allison V-1710-39 engines.
Built at Inglewood, California. 50 Lend-Leased to the RAF as the "Mustang II".
Prototypes of P-51B
Built at Inglewood, California. First production version to be equipped with the Merlin engine. 308 supplied under Lend-Lease and operated by the RAF as "Mustang III".
First P-51 variant to be built at North American's Dallas plant. Identical to P-51B. Mustangs built by North American in Dallas were suffixed "-NT". 636 were supplied under Lend-Lease to the RAF as the "Mustang III".
Prototypes of P-51D
6,600 built at Inglewood and 1,600 built at Dallas. 100 P-51D-1-NA were sent unassembled to Australia. 282 under Lend-Lease served in the RAF as the "Mustang IV".
Lightweight version; five-bladed propeller
Built at Inglewood, California
Allison-engined lightweight development.
Built at Dallas, Texas. Identical to the P-51D except fitted with a four-bladed Aeroproducts propeller. 600 Lend-Leased to the RAF as the "Mustang IVa".
Same as P-51D-25-NT and P-51D-30-NT, but with the non-water injected V-1650-9A engine for low-altitude operations and sharing the cuffless Hamilton Standard propeller. It was intended to enter full production at Dallas, but the contract was later cancelled.
100 unassembled P-51D-1-NA were delivered as kits to Australia, but only 80 were built.
CAC CA-18 Mustang Mk 21, Mk 22 and Mk 23
License production in Australia of 120 (170 were originally ordered) P-51D. The Mk 21 and Mk 22 used the American-built Packard V-1650-3 or V-1650-7 engine and the Mk 23 (which followed the Mk 21) was powered by a Rolls-Royce Merlin 66 or Merlin 70 engine.
Five prototype conversions only - two Mustang Mk I airframes were initially trial fitted with Rolls-Royce Merlin 65 engines in mid-late 1942, in order to test the performance of the aircraft with a powerplant better adapted to medium/high altitudes. The successful conversion of the Packard V-1650 Merlin-powered P-51B/C equivalent rendered this experiment as superfluous. Although the conversions were highly successful, the planned production of 500 examples was cancelled.
^Because the new fighter was designed to a British, rather than an American or USAAC specification, it was allocated a private-venture civil designation instead of the more usual XP- (eXperimental Pursuit) group.
^For more specific information on the P-51's airfoil, known as the NAA/NACA 45-100 series, see
^This was one of the last US applications of gun synchronization - later American single piston-engined fighters, including later models of the Mustang, all had their gun armament concentrated in the wings.
^One of the NA-73s given to the army, s/n 41-038 is still in existence and last flew in 1982.
^All but three of these FGs flew P-38s, P-40s or P-47s before converting to the Mustang.
^"Ziemi Czerwie?skiej" = "Land of Czerwien", RAF Polish units retained the name and the logo of a squadron from the Polish Air Force which fought the Germans in 1939.
^The P-51D and K Maintenance manual notes that carrying 1,000 lb bombs was not recommended, because the racks were not designed for them. Six rockets could be carried on removable "Zero Rail" launchers with the wing racks installed, 10 without wing racks.
^"We also found out, later on, that the heat from the engine actually produced thrust... That horsepower gained by the radiator was only discovered by wind-tunnel investigation..." Mustang Designer, Edgar Schmued and the P-51, p. 61. Comparison was between wind-tunnel tests of full-scale models, with normal heating (thermic engine) and without heat production (electric engine).
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