F-86 Sabres

The North American F-86 Sabre, sometimes called the Sabrejet, is a transonic jet fighter aircraft. Produced by North American Aviation, the Sabre is best known as the United States' first swept-wing fighter that could counter the swept-wing Soviet MiG-15 in high-speed dogfights in the skies of the Korean War (1950–1953), fighting some of the earliest jet-to-jet battles in history. Considered one of the best and most important fighter aircraft in that war, the F-86 is also rated highly in comparison with fighters of other eras. Although it was developed in the late 1940s and was outdated by the end of the 1950s, the Sabre proved versatile and adaptable and continued as a front-line fighter in numerous air forces.

Its success led to an extended production run of more than 7,800 aircraft between 1949 and 1956, in the United States, Japan, and Italy. In addition, 738 carrier-modified versions were purchased by the US Navy as FJ-2s and -3s. Variants were built in Canada and Australia. The Canadair Sabre added another 1,815 aircraft and the significantly redesigned CAC Sabre (sometimes known as the Avon Sabre or CAC CA-27), had a production run of 112. The Sabre is by far the most-produced Western jet fighter, with a total production of all variants at 9,860 units.Winchester 2006, p. 184.

Development

North American Aviation had produced the propeller-powered P-51 Mustang in World War II, which saw combat against some of the first operational jet fighters. By late 1944, North American proposed its first jet fighter to the U.S. Navy, which became the FJ-1 Fury. It was an unexceptional transitional jet fighter that had a straight wing derived from the P-51. Initial proposals to meet a United States Army Air Forces (USAAF) requirement for a medium-range, single-seat, high-altitude, jet-powered day escort fighter/fighter bomber were drafted in mid-1944. In early 1945, North American Aviation submitted four designs. The USAAF selected one design over the others and granted North American a contract to build three examples of the XP-86 ("experimental pursuit"). Deleting specific requirements from the FJ-1 Fury, coupled with other modifications, allowed the XP-86 to be lighter and considerably faster than the Fury, with an estimated top speed of , versus the Fury's . Despite the gain in speed, early studies revealed the XP-86 would have the same performance as its rivals, the XP-80 and XP-84. Because these rival designs were more advanced in their development stages, it was feared that the XP-86 would be cancelled.

Crucially, the XP-86 was not able to meet the required top speed of ; North American had to quickly devise a radical change that could leapfrog its rivals. The North American F-86 Sabre was the first American aircraft to take advantage of flight research data seized from the German aerodynamicists at the end of World War II."North American F-86."
''Aviation History On-line Museum''. Retrieved: 20 August 2010. These data showed that a thin, swept wing could greatly reduce drag and delay compressibility problems that had bedeviled fighters such as the Lockheed P-38 Lightning when approaching the speed of sound. By 1944, German engineers and designers had established the benefits of swept wings based on experimental designs dating back to 1940. A study of the data showed that a swept wing would solve their speed problem, while a slat on the wing's leading edge that extended at low speeds would enhance low-speed stability.

Because development of the XP-86 had reached an advanced stage, the idea of changing the sweep of the wing was met with resistance from some senior North American staff. Despite stiff opposition, after good results were obtained in wind tunnel tests, the swept-wing concept was eventually adopted. Performance requirements were met by incorporating a 35° swept-back wing, using modified NACA four-digit airfoils, NACA 0009.5–64 at the root and NACA 0008.5–64 at the tip,Lednicer, David
"The Incomplete Guide to Airfoil Usage."
''ae.illinois.edu,'' 15 October 2010. Retrieved: 19 July 2011. with an automatic slat design based on that of the Messerschmitt Me 262 and an electrically adjustable stabilizer, another feature of the Me 262A. Many Sabres had the "6–3 wing" (a fixed leading edge with a 6-inch extended chord at the root and a 3-inch extended chord at the tip) retrofitted after combat experience was gained in Korea. This modification changed the wing airfoils to the NACA 0009-64 modified configuration at the root and the NACA 0008.1–64 mod at the tip.

The XP-86 prototype, which led to the F-86 Sabre, was rolled out on 8 August 1947. The first flight occurred on 1 October 1947 with George Welch at the controls, flying from Muroc Dry Lake (now Edwards AFB), California.

The United States Air Force's Strategic Air Command had F-86 Sabres in service from 1949 through 1950. The F-86s were assigned to the 22nd Bomb Wing, the 1st Fighter Wing, and the 1st Fighter Interceptor Wing. The F-86 was the primary U.S. air combat fighter during the Korean War, with significant numbers of the first three production models seeing combat.

The F-86 Sabre was also produced under license by Canadair, Ltd, as the Canadair Sabre. The final variant of the Canadian Sabre, the Mark 6, is generally rated as having the highest capabilities of any Sabre version.

Breaking sound barrier and other records

The F-86A set its first official world speed record of on September 15, 1948, at Muroc Dry Lake, flown by Major Richard L. Johnson, USAF. Five years later, on 18 May 1953, Jacqueline Cochran became the first woman to break the sound barrier, flying a "one-off" Canadian-built F-86 Sabre Mk 3, alongside Chuck Yeager.Knaack 1978, p. 52. Col. K. K. Compton won the 1951 Bendix air race in an F-86A with an average speed of 553.76 mph (891.19 km/h).

On 2 February 1958, a team of Pakistan Air Force F-86 Sabres called "Falcons" set a world record at PAF Base Masroor by performing a loop while in a 16 aircraft diamond formation. The team was led by then Wing Commander Zafar Masud.

Design

Overview

The F-86 was produced as both a fighter-interceptor and fighter-bomber. Several variants were introduced over its production life, with improvements and different armament implemented (see below). The XP-86 was fitted with a General Electric J35-C-3 jet engine that produced of thrust. This engine was built by GM's Chevrolet division until production was turned over to Allison. The General Electric J47-GE-7 engine was used in the F-86A-1 producing a thrust of , while the General Electric J73-GE-3 engine of the F-86H produced of thrust.

The fighter-bomber version (F-86H) could carry up to of bombs, including an external fuel-type tank that could carry napalm. Unguided rockets were used on some fighters on training missions, but rockets were later carried on combat operations. The F-86 could also be fitted with a pair of external jettisonable jet fuel tanks (four on the F-86F beginning in 1953) that extended the range of the aircraft. Both the interceptor and fighter-bomber versions carried six M3 Browning machine guns with electrically-boosted feed in the nose (later versions of the F-86H carried four cannon instead of machine guns). Firing at a rate of 1,200 rounds per minute, the 0.50-inch guns were harmonized to converge at in front of the aircraft, using armor-piercing (AP) and armor-piercing incendiary (API) rounds, with one armor-piercing incendiary tracer (APIT) for every five AP or API rounds. The API rounds used during the Korean War contained magnesium, which were designed to ignite upon impact, but burned poorly above as oxygen levels were insufficient to sustain combustion at that height. Initial planes were fitted with the Mark 18 manual-ranging computing gun sight. The last 24 F-86A-5-Nas and F-86Es were equipped with the A-1CM gunsight-AN/APG-30 radar, which used radar to automatically compute a target's range, which later proved to be advantageous against MiG opponents over Korea.

Flying characteristics

The Sabre's swept wings and jet engine produced a flying experience that was very different from the propeller-driven fighters of the time. The transition from props to jets was not without accidents and incidents even for experienced fighter pilots. Early on in the jet age, some US manufacturers instituted safety and transition programs where experienced test and production pilots toured operational fighter squadrons to provide instruction and demonstrations designed to lower the accident rate.

Additionally, the ongoing technical development and long production history of the F-86 resulted in some significant differences in the handling and flying characteristics between the various F-86 models. Some of the important changes to the design included the switch from an elevator/stabilizer to an all-flying tail, the discontinuation of leading edge slats for a solid leading edge with increased internal fuel capacity, increased engine power, and an internal missile bay (F-86D). Each of these design changes impacted the handling and flying characteristics of the F-86, not necessarily for the better. In the case of the solid leading edge and increased internal fuel capacity, the design change produced increased combat performance but exacerbated a dangerous and often fatal handling characteristic upon take-off if the nose were raised prematurely from the runway. This 'over-rotation' danger is now a major area of instruction and concern for current F-86 pilots. The 1972 Sacramento Canadair Sabre accident resulting in 22 fatalities and 28 other casualties was a result of over-rotation on take-off.

Operational history

Korean War

The F-86 entered service with the USAF in 1949, joining the 1st Fighter Wing's 94th Fighter Squadron and became the primary air-to-air jet fighter used by the Americans in the Korean War. While earlier straight-winged jets such as the P-80 and F-84 initially achieved air victories, when the swept-wing Soviet MiG-15 was introduced in November 1950, it outperformed all UN-based aircraft. In response, three squadrons of F-86s were rushed to the Far East in December.Thompson, Warren
"Sabre: The F-86 in Korea."
''Flight Journal'', December 2002. Retrieved: 30 June 2011. Early variants of the F-86 could not out-turn MiG-15s, but they could out-dive them. The MiG-15 was superior to early F-86 models in ceiling, acceleration, rate of climb, and zoom. With the introduction of the F-86F in 1953, however, the two aircraft were more closely matched, with many combat-experienced pilots claiming a marginal superiority for the F-86F. The heavier firepower of the MiG (and many other contemporary fighters) was addressed by “Project Gun-Val” which saw the combat testing of seven F-86Fs each armed with four 20 mm T-160 cannons (such F-86s were designated as F-86F-2s). Despite being able to fire only two of the four 20 mm cannon at a time, the experiment was considered a success and signaled the end of the decades-long use of the Browning .50 caliber in the air-to-air role.Ray Wagner, The North American Sabre The MiGs flown from bases in Manchuria by Chinese, North Korean, and Soviet VVS pilots were pitted against two squadrons of the 4th Fighter-Interceptor Wing forward-based at K-14, Kimpo, Korea. In October 1951, the Soviets managed to recover a downed Sabre, and in their investigation of the type they concluded that the Sabre's advantage in combat was due to the APG-30 gun-sight that facilitated accurate fire at longer ranges.

Many of the American pilots were experienced World War II veterans, while the North Koreans and the Chinese lacked combat experience, thus accounting for much of the F-86's success."Fact Sheet: The United States Air Force in Korea."
''National Museum of the United States Air Force.'' Retrieved: 7 June 2011. However, United Nations pilots suspected many of the MiG-15s were being flown by experienced Soviet pilots who also had combat experience in World War II. Former Communist sources now acknowledge Soviet pilots initially flew the majority of MiG-15s that fought in Korea, and dispute that more MiG-15s than F-86s were shot down in air combat. Later in the war, North Korean and Chinese pilots increased their participation as combat flyers.
''acepilots/com.'' Retrieved: 20 August 2010. The North Koreans and their allies periodically contested air superiority in MiG Alley, an area near the mouth of the Yalu River (the boundary between Korea and China) over which the most intense air-to-air combat took place. Although the F-86A could be safely flown through Mach 1, the F-86E's all-moving tailplane greatly improved maneuverability at high speeds. The MiG-15 could not safely exceed Mach 0.92, an important disadvantage in near-sonic air combat. Far greater emphasis had been given to the training, aggressiveness, and experience of the F-86 pilots. American Sabre pilots were trained at Nellis, where the casualty rate of their training was so high, they were told, "If you ever see the flag at full staff, take a picture." Despite rules of engagement to the contrary, F-86 units frequently initiated combat over MiG bases in the Manchurian "sanctuary".

The needs of combat operations balanced against the need to maintain an adequate force structure in Western Europe led to the conversion of the 51st Fighter-Interceptor Wing from the F-80 to the F-86 in December 1951. Two fighter-bomber wings, the 8th and 18th, converted to the F-86F in the spring of 1953. No. 2 Squadron, South African Air Force (SAAF) also distinguished itself flying F-86s in Korea as part of the 18 FBW.

On 17 June 1951, at 01:30 hours, Suwon Air Base was bombed by two Polikarpov Po-2 biplanes. Each Po-2 dropped a pair of fragmentation bombs: one scored a hit on the 802nd Engineer Aviation Battalion's motor pool, damaging some equipment. Two bombs burst on the flightline of the 335th Fighter Interceptor Squadron. One F-86A Sabre (FU-334 / 49-1334) was struck on the wing and began burning. The fire took hold, gutting the aircraft. Prompt action by personnel who moved aircraft away from the burning Sabre prevented further loss. Eight other Sabres were damaged in the brief attack, four seriously. One F-86 pilot was among the wounded. The North Koreans subsequently credited Lt. La Woon Yung with this damaging attack.

By the end of hostilities, F-86 pilots were credited with shooting down 792 MiGs for a loss of only 78 Sabres in air-to-air combat, a victory ratio of 10:1. Of the 41 American pilots who earned the designation of ace during the Korean War, all but one flew the F-86 Sabre, the exception being a Navy Vought F4U Corsair night fighter pilot. However, after the war, the USAF reviewed its figures in an investigation code-named ''Sabre Measure Charlie'' and downgraded the kill ratio of the North American F-86 Sabre against the Mikoyan-Gurevich MiG-15 by half. Internally, the USAF accepted that its pilots in fact downed ~ 200 MiGsStillion, John and Scott Perdue
"Air Combat Past, Present and Future."
''Project Air Force'', Rand, August 2008. Retrieved" 11 March 2009.

According to Soviet data, the Soviets lost 335 MiG-15s in Korea to all causes, including accidents, antiaircraft fire, and ground attacks. Chinese claims of their losses amount to 224 MiG-15s in Korea. North Korean losses are not known, but according to North Korean defectors, their air force lost around 100 MiG-15s during the war. Thus, 659 MiG-15s are admitted as being lost, many of these to F-86 Sabres The Soviets claimed to have downed over 600 Sabres, together with the Chinese claims (211 F-86s shot-down), although these cannot be reconciled with the number of Sabres recorded as lost by the US.

The status of many claimed air-to-air victories in the Korean War has been increasingly debated as more data becomes available, showing that instances of over-claiming abounded on both sides. The research by Dorr, Lake and Thompson claimed an F-86 kill ratio closer to 2:1. A recent RAND report made reference to "recent scholarship" of F-86 v MiG-15 combat over Korea and concluded that the actual kill:loss ratio for the F-86 was 1.8:1 overall, and likely closer to 1.3:1 against MiGs flown by Soviet pilots. However, this ratio did not count the number of aircraft of other types (including the B-29, A-26, F-80, F-82, F-84 and Gloster Meteor) shot down by MiG-15 pilots.

Data-matching with Soviet records suggests that US pilots routinely attributed their own combat losses to "landing accidents" and "other causes". According to official US data ("USAF Statistical Digest FY1953"), the USAF lost 250 F-86 fighters in Korea. Of these, 184 were lost in combat (78 in air-to-air combat, 19 by anti-aircraft guns, 26 were "unknown causes" and 61 were "other losses") and 66 in incidents. South African Air Force lost 6 F-86s in the war. This gives 256 confirmed F-86 losses during the Korean War.

1958 Taiwan Strait crisis

The Republic of China Air Force of Taiwan was an early recipient of surplus USAF Sabres. From December 1954 to June 1956, the ROC Air Force received 160 ex-USAF F-86F-1-NA through F-86F-30-NA fighters. By June 1958, the Nationalist Chinese had built up an impressive fighter force, with 320 F-86Fs and seven RF-86Fs having been delivered.

Sabres and MiGs were shortly to battle each other in the skies of Asia once again in the Second Taiwan Strait Crisis. In August 1958, the Chinese Communists of the People's Republic of China attempted to force the Nationalists off of the islands of Quemoy and Matsu by shelling and blockade. Nationalist F-86Fs flying combat air patrol over the islands found themselves confronted by Communist MiG-15s and MiG-17s, and numerous dogfights resulted.

During these battles, the Nationalist Sabres introduced a new element into aerial warfare. Under a secret effort designated Operation Black Magic, the U.S. Navy had provided the ROC with the AIM-9 Sidewinder, its first infrared-homing air-to-air missile, which was just entering service with the United States. A small team from VMF-323, a Marine FJ-4 Fury squadron with later assistance from China Lake and North American Aviation, initially modified 20 of the F-86 Sabres to carry a pair of Sidewinders on underwing launch rails and instructed the ROC pilots in their use flying profiles with USAF F-100s simulating the MiG-17. The MiGs enjoyed an altitude advantage over the Sabres, as they had in Korea, and Communist Chinese MiGs routinely cruised over the Nationalist Sabres, only engaging when they had a favorable position. The Sidewinder took away that advantage and proved to be devastatingly effective against the MiGs.

Pakistan Air Force

In 1954, Pakistan started receiving the first of a total of 102 F-86F Sabres under the Mutual Defense Assistance Program. Many of these aircraft were F-86F-35s from USAF stocks, but some were from the later F-86F-40-NA production block (made specifically for export). Many of the F−35s were brought up to F−40 standards before they were delivered to Pakistan, but a few remained F−35s. The F-86 was operated by nine Pakistan Air Force (PAF) squadrons at various times: Nos. 5, 11, 14, 15, 16, 17, 18, 19, and 26 Squadrons.

Moreover in April 1959, a PAF F-86F flown by Flight Lieutenant Yunis of the No. 15 Squadron "Cobras" shot down an Indian Canberra Spy Plane over Rawalpindi marking the first aerial victory for the Pakistan Air Force.

In 1966, Pakistan accquired 90 Ex-Luftwaffe CL-13 Mk.6s via Iran due to postwar US sanctions. They were known as the F-86E in the PAF. (Not to be confused with the North American F-86E variants)

The last of the Sabres were withdrawn from PAF service in 1980 & were replaced with the Shenyang F-6 fighters. In total Pakistani pilots flew 320,185 hours in the Sabres out of which about 4,500 hours were flown in wartime operations.They are now on display at PAF Museum

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