F-82 Twin Mustang

Infobox Aircraft
name= P-82/F-82 Twin Mustang


caption= XP-82 prototype
type= Long-range escort fighter and night fighter
manufacturer= North American Aviation
designer=
first flight= 6 July 1945
introduced= 1946
retired= 1953
status=
primary user= United States Air Force
more users=
produced=
number built=270
unit cost= US$215,154Knaack, Marcelle Size. "Encyclopedia of US Air Force Aircraft and Missile Systems: Volume 1 Post-World War II Fighters 1945-1973". Washington, DC: Office of Air Force History, 1978. ISBN 0-912799-59-5.]
developed from = P-51 Mustang
variants with their own articles=

The North American F-82 Twin Mustang was the last American piston engine fighter ordered into production by the United States Air Force. Based on the P-51 Mustang, the F-82 was originally designed as a long-range escort fighter in World War II, its postwar role changed to that of night-fighting. Radar-equipped F-82s were used quite extensively by the Air Defense Command as replacements for the P-61 Black Widow night fighter. During the Korean War, Japan-based F-82s were among the first USAF aircraft to operate over Korea. The first three North Korean aircraft destroyed by U.S. forces were shot down by F-82s.

Design and development

Initially intended as a very long-range (VLR) escort fighter, the F-82 was designed to escort B-29 bombers on missions exceeding 2,000 miles from the Solomons or Philippines to Tokyo, missions beyond the range of the P-38 and conventional P-51s. Such missions were part of the planned U.S. invasion of the Japanese home islands, which was forestalled by the surrender of Japan days after the atomic bombings of Hiroshima and Nagasaki.

In October 1943, the North American Aircraft design team began work on a fighter design that could travel over 2,000 miles without refueling. It consisted of a two fuselage design, somewhat similar to the experimental German Messerschmitt Bf 109Z "Zwilling". Although based on the lightweight experimental XP-51F, which would later become the P-51H Mustang, it was actually an entirely new design. North American Design Chief Edgar Schmued incorporating two P-51H Mustang fuselages lengthened by the addition of a 57-inch fuselage plug located behind the cockpit where additional fuel tanks and equipment could be installed. These were mounted to a newly-designed center wing section containing the same six .50-caliber Browning M2 machine guns as a single-engine Mustang, but with more concentrated fire. The outer wings were strengthened to allow the addition of hard points for carrying additional fuel or 1000 pounds of ordnance. The two vertical tails were also from the XP-51F, but incorporated large dorsal fillets for added stability in case of an engine failure. The aircraft had a standard landing gear with both wheels retracting into bays under the each fuselage center section. The XP-82 was to be powered by two Packard-built Rolls-Royce V-1650 Merlin engines. Initially, the left engine was a V-1650-23 with a gear reduction box to allow its left propeller to turn opposite to the right engine, which was the more conventional V-1650-25. In this arrangement both propellers would turn upward as they approached the center wing, which in theory would have allowed better single-engine control. This proved not to be the case when the aircraft refused to become airborne during its first flight attempt. After a month of work North American engineers finally discovered that rotating the propellers to meet in the center on their upward turn created sufficient drag to cancel out all lift from the center wing section, one quarter of the aircraft's total wing surface area. The engines and propellers were then exchanged, with their rotation meeting on the downward turn, and the problem was fully solved. The first XP-82 prototype (44-83886) was completed on 25 May 1945, and made the type's first successful flight on 26 June 1945. This aircraft was accepted by the Army Air Force on 30 August 1945. AAF officials were so impressed by the aircraft while still in development that they ordered the first production P-82Bs in March 1945, fully three months before the aircraft's first flight. Prototype XP-82s, P-82Bs and P-82Es retained both fully equipped cockpits so that pilots could fly the aircraft from either position, alternating control on long flights, while later night fighter versions kept the cockpit on the left side only, placing the radar operator in the right position.

Although some P-82B airframes were completed before the end of World War II, most remained at the North American factory in California waiting for engines until 1946. As a result, none saw service during the war.

Like the P-51 Mustang, the first two prototype XP-82s, as well as the next 20 P-82B models were powered by British designed Rolls-Royce Merlin engines, built under licence by Packard. These provided the fighter with excellent range and performance, but political pressurefrom the U.S. Procurement Office disputed-inline, as well as the increased licence fees demanded by Rolls-Royce, forced North American to switch subsequent production P-82C and later models to the lower powered Allison V-1710-100 engines. Allison powered P-82 models demonstrated a lower top speed and poorer high altitude performance than the earlier Merlin powered versions.The earlier P-82B models were designated as trainers, while the "C" and later models were employed as fighters, making the P-82 one of the few aircraft in U.S. military history to be faster in its trainer version than the fighter version.

Operational service

On 11 June 1948 the newly-formed United States Air Force eliminated the P-for-pursuit category and replaced it with F-for-fighter. Subsequently, all P-82s were re-designated F-82. The F-82E was the first model to reach operational squadrons and its initial operational assignment was to the 27th Fighter Wing at Kearney Air Force Base, Nebraska in 1948. The 27th used the F-82E to fly long-range escort missions for SAC B-29 bombers. F-82Es continued to fly actively until 1953 escorting B-29s, B-50s and B-36s becoming Strategic Air Command's last operational piston-engined fighters.

The cessation of hostilities in World War II ended the need for a long-range bomber escort, though the F-82 continued as a replacement for the aging P-61 Black Widow night fighter.

The night fighter versions, designated the F-82F/G, required numerous modifications. The right side cockpit was replaced with a radar operator's position without flight controls. A long radar pod, resembling a sausage and irreverently known as a "long dong", was attached to the underside of the center wing, below the six .50 caliber machineguns and with its dish in front of the propellers to prevent signal interference. This unconventional arrangement was found not to affect the aircraft's performance seriously. Additionally the unit could be jettisoned in an emergency, or for belly landings; it was sometimes lost during high-G maneuvers.

The first F-82F/G models began to reach operational squadrons in late 1948. By the middle of 1949 the F-82 was in widespread service with some 225 E/F/G models being in use by the USAF at Bergstrom, Hamilton, McChord, Mitchel and McGuire AFB. F-82Gs were also deployed to the 347th Fighter Group in Japan. Modified F-82s for cold weather (F-82Hs) were assigned to Ladd AFB, Alaska, and make a brief but memorable appearance in the movie "Top of the World." [ [http://www.imdb.com/title/tt0048735 Top of the World] ] (1955)

Korean War

Although not operational during World War II, the F-82G was effective during the Korean War. In June 1950, U.S. forces in Seoul, South Korea were attempting to evacuate U.S. civilians, including many women and children, from the advancing North Korean Army. A total of 682 civilians had been evacuated on the 26 June aboard the Norwegian freighter "Reinholte", then visiting Inchon Harbor and transported to Sasebo, Japan. The remaining civilians were to be evacuated the following day by an Air Force C-54. Fearing that the North Korean Air Force might try to shoot down the transport (a C-54 had been destroyed on the ground at Kimpo by North Korean fighters on June 25th) the Air Force requested air cover to protect the aircraft during takeoff. The F-80 Shooting Star was available, but its thirsty jet engine meant it could only remain over the airfield for a few minutes before having to return to base and no P-51 Mustangs were available.

Fortunately, the 4th and 339th Fighter All Weather Squadrons F(AW)S with their F-82Gs were based in Japan and Okinawa at Misawa and Yokota Airfields, and the 68th F(AW)S was based at Itazuke airfield. With Lt. Col. John F. Sharp in command, 27 F-82Gs of the 35 in the theater answered the call. Arriving in the early morning, they orbited Kimpo Airfield in three flights, each above the other. Suddenly, at 1150 hours, a mixed lot of five North Korean fighters (Soviet-built Yak-9s, Yak-11s and La-7s) appeared, heading for the airfield. One of the Yak-9s immediately scored several hits on 68th F(AW)S pilot Lt. Charles Moran's vertical stabilizer. Moments later, Lt. William G. "Skeeter" Hudson, also of the 68th F(AW)S, initiated a high-G turn to engage the Yak. Soon Hudson was closing in on the Yak's tail. He then fired a short burst at close range, scoring hits with his six .50 caliber machine guns. The Yak banked hard to the right, with the F-82G in close pursuit. A second burst hit the Yak's right wing, setting the gas tank on fire and knocking off the right flap and aileron. The North Korean pilot bailed out, but his observer, who was either dead or badly wounded, remained in the doomed aircraft. Parachuting down to Kimpo Airfield, the North Korean pilot was immediately surrounded by South Korean soldiers. Surprisingly, he pulled out a pistol and began firing at them. The South Korean soldiers returned fire, killing the pilot. Moments later, Lt. Moran shot down an La-7 over the airfield, while a few miles away, Maj. James W. Little, commanding officer of the 339th F(AW)S, shot down another La-7. The C-54 was able to escape safely. Of five North Korean fighters, only two returned to their base. In the process, Lt. William G. "Skeeter" Hudson, with his radar operator Lt. Carl Fraiser had scored the first aerial "kill" of the Korean War.Fact|date=October 2007

It is generally believed that the aircraft Hudson and Fraiser flew that day was an F-82G named "Bucket of Bolts" (s/n "46-383"), as their usual aircraft was down for repairs. "Bucket of Bolts" would survive the Korean War and eventually be reassigned to escort duty in Alaska. It is believed to have been scrapped at Ladd AFB, Alaska in 1953.

1951 was the last full year of F-82 operations in Korea, as they were gradually replaced by the jet-powered F-94 Starfire. Twin Mustangs destroyed 20 enemy aircraft, four in the air and 16 on the ground during the conflict.

By summer 1952, the last surviving Korean War veteran F-82s were flown to Tachikawa, Japan to be upgraded to F-82H models with the addition of cold weather equipment and additional de-icers. Many of these fighters later operated with Strategic Air Command from airfields in Alaska where they served as escorts for the massive Convair B-36 bombers during long flights over the Arctic, finally fulfilling their original mission as a bomber escort. The F-82 did not disappear from USAF inventory until 1953, when a lack of parts made it impossible to keep the aging airframes flying. Many were ultimately scrapped in Alaska.

Record-setting

On 27 February 1947, a P-82B ("44-65168") named "Betty Jo" and flown by Colonel Robert E. Thacker made history when it flew nonstop from Hawaii to New York without refueling, a distance of 5,051 miles in 14 hr 32 min (347.5mph). To this day, it remains the longest nonstop flight ever made by a propeller-driven fighter, and the fastest such a distance has ever been covered in a piston-engined aircraft (the record for the longest nonstop flight by a propeller-driven aircraft of any type is held by the Rutan Voyager). The aircraft chosen was an earlier "B" model powered by Rolls-Royce Merlin engines (see "Survivors" below).

Variants

;NA-123:Basic Development design. The NA-123 design was presented by North American Aircraft to the USAAF in February 1944. The design for the new aircraft was for a long range fighter to penetrate deep into enemy territory. Its immediate role would be to escort the B-29 Superfortress bombers used in the Pacific Theater of Operations against Japan. The USAAF endorsed it at once. A letter contract to construct and test four experimental XP-82 aircraft (P-82 designation) gave way in the same month to an order for 500 production models.;XP-82 / XP-82A:Prototype. The USAAF accepted the first XP-82 in August 1945 and a second one in September. Both were equipped with Packard Merlin V-1650-23 and -25 engines. The third experimental aircraft, designated XP-82A, had two Allison V-1710-119 engines. It was accepted in October 1945. There is no evidence that the XP-82A was ever actually flown, due to problems with the Allison engines. The fourth XP-82A prototype ("44-83889") was cancelled.

;P-82B:Planned production version. With the end of World War II, production plans were cut back significantly. Against the 500 P-82Bs initially planned, overall procurement was finalized on 7 December 1945 at 270 P-82s. Included were 20 P-82Bs already on firm order and later allocated to testing as P-82Z. The USAAF accepted all P-82Zs in fiscal year 1947. Two aircraft were accepted in January 1946, four in February 1947, and 13 in March 1947. By December 1949, no P-82Bs (by then redesignated F-82Bs) remained in the Air Force inventory. These P-82Bs were basically similar to the XP-82, but differed in having provisions for underwing racks. ;P-82C:Night fighter version. A P-82B, (44-65169) modified in late 1946, for testing as a night interceptor. The P-82C featured a new nacelle (under the center wing section) housing an SCR-720 radar. The SCR-720 was the same radar installation which was carried aboard the Northrop P-61 Black Widow, a considerably larger aircraft which had clearance problems with the engine propellers. The right-hand cockpit became the radar operator's position. The production version was designated P-82F.;P-82D:Night fighter version. Another P-82B ("44-65170") modified with a different radar, the APS-4. The APS-4 was a much smaller set than the SCR-720, and operated in the three cm waveband. As like the P-82C, the right-hand cockpit became the radar operator's position. The production version was designated P-82G.;P-82E:Escort fighter version. The F-82E followed the F-82B, which it so closely resembled. They were equipped with two counter-rotating Allison liquid-cooled engines, V-1710-143 and V-1710-145. The first four F-82Es were redesignated as F-82As and were allocated for engine testing. After production delays by engine problems and additional testing, F-82Es entered operational service in May 1948. The Air Force accepted 72 F-82Es in fiscal year 1948 (between January and June 1948), and 24 in fiscal year 1949 (22 in July 1948, one in October, and one in December). F-82Es quickly disappeared from the SAC inventory. The first sizable lot was declared surplus in March 1950.;P-82F/G/H:Night fighter versions. A nacelle beneath the center-wing that housed radar equipment (F-82F's ANIAPG28 and F-82G's SCR-720C18); automatic pilot; and a radar operator replacing the second pilot. When winterization was added to the F or G, it became an F-82H. Entered operational service in September 1948. One F-82G was accepted in fiscal year 1948 (February 1948), all other F-82s (F, G, and H models) in fiscal year 1949. The last F-82G and six winterized F-82Hs were received in March 1949. In mid-1950, Air Defense units began trading F-82s for F-94s, and in early 1951, the few Twin-Mustangs remaining in ADC were towing targets. The F-82s coming out of Korean combat in February 1952 lingered a bit longer in the inventory. After June 1953, no F-82s appeared on Air Force, Air National Guard or Air Reserve Forces rolls.

Production totals

The Air Force accepted a total of 272 F-82s (including 22 prototype, test and early production aircraft). All examples were redesignated as F-82 in 1948. Specifically, the F-82 program consisted of two XF-82s, one XF-82A, ten F-82Bs (known for a while as P-82Zs and all allocated to testing), four F-82As, 96 F-82Es, 91 F-82Fs, 45 F-82Gs and 14 F-82Hs.

Operators

;flag|United States|1912
*United States Army Air Force
**51st Fighter Wing
***4th Fighter (All Weather) Squadron

*United States Air Force
**27th Fighter Wing operated F-82E between 1948 and 1950.
***522nd Fighter (All Weather) Squadron
***523rd Fighter (All Weather) Squadron
***524th Fighter (All Weather) Squadron
**51st Fighter Wing operated F-82F/G between 1949 and 1950.
***4th Fighter (All Weather) Squadron was assigned to 347th Fighter Group effective 20 February 1947, but attached to 51st Fighter Group 20 February 1947 - 24 June 1950. Squadron permanently reassigned to 6302d Air Base Group, 20 September 1950.
***16th Fighter (All Weather) Squadron
***25th Fighter (All Weather) Squadron
***26th Fighter (All Weather) Squadron
**52d Fighter Wing operated F-82F/G between 1948-1950.
***2d Fighter (All Weather) Squadron
***5th Fighter (All Weather) Squadron
**325th Fighter Wing operated F-82F/G between 1948-1950.
***317th Fighter (All Weather) Squadron
***318th Fighter (All Weather) Squadron
***319th Fighter (All Weather) Squadron
**347th Fighter Wing operated F-82F/G between 1949-1950.
***4th Fighter (All Weather) Squadron was assigned to 347th Fighter Group effective 20 February 1947, but attached to 51st Fighter Group 20 February 1947 - 24 June 1950. Squadron served in combat during the Korean War permanently reassigned to 6302d Air Base Group (20 September 1950 - 24 June 1951), later to 6351st Air Base Wing (25 June 1951 – 1952).
***68th Fighter (All Weather) Squadron served in combat during the Korean War assigned to 8th Fighter-Bomber Group (1 March - 1 December 1950), later to 51st Fighter-Interceptor Group (25 September - 9 October 1950).
***339th Fighter (All Weather) Squadron served in combat during the Korean War assigned to 8th Fighter-Bomber Group (26 June - 5 July 1950), later to 35th Fighter-Interceptor Group (6 July - 1 December 1950).
**5001st Composite Wing operated F-82H between 1949-1953.
***449th Fighter (All Weather) Squadron

urvivors

Five F-82s are known to still exist.

* F-82B "Betty Jo" ("44-65168") is currently on display at The National Museum of the United States Air Force, in Dayton, Ohio in its Cold War gallery. The aircraft is displayed in the markings of its historic Hawaii to New York flight in 1947, along with clothing and artifacts used in that record-breaking flight.
* F-82E ("46-262") has been a "gate guard" for many years outside Lackland AFB in Texas as part of the USAF History and Traditions Museum in San Antonio, Texas.
* A second F-82B ("44-65162") that had been on display next to it, was acquired by the former Commemorative Air Force in 1966 and was operated for many years by its Midland, Texas squadron. That F-82B stalled while landing in Harlingen, Texas in 1987. The aircraft was restorable but its unique props and landing gear were destroyed in the crash and replacement parts could not be obtained. In 2002, the CAF included it with a crashed P-38 in a trade for a flyable P-38. The USAF stepped in and demanded the F-82 be returned since it was only loaned to the CAF on the condition that the CAF keep it. The matter has yet to be resolved. This aircraft is now located in California where recent efforts have been made to restore it to flying condition.
* A single fuselage and parts of the second XP-82 ("44-83887") were located for many years on the farm of Walter Soplata in Newbury, Ohio.Fact|date=June 2008 this aircraft was sold in March, 2008 to aircraft restorer Tom Reilly. On April 7th, 2008 the almost-complete left fuselage with original markings still visible was delivered to Reilly's restoration facility in Douglas, GA along with various surviving components from Soplata's farm. Reilly plans to use the left fuselage to reverse-engineer a matching right airframe, and hopes to eventually restore the aircraft to flying condition. This is by far the most ambitious F-82 restoration project in progress. With the problems encountered by the CAF over a period of 20 years in locating just a set of props and landing gear to return their aircraft back to the air, one can see the enorminity of Tom Reilly's task.
* F-82E ("46-256"), an intact airframe also formerly located at the Walter Soplata farm, has been sold and moved to C&P Aviation in Anoka, MN, where it is currently undergoing restoration to flying status.

pecifications (F-82G)

aircraft specifications

plane or copter?=plane
jet or prop?=prop
ref=GlobalSecurity.org [http://www.globalsecurity.org/military/systems/aircraft/f-82-specs.htm Global Security - F-82 Twin Mustang] ]
crew=2
length main=42 ft 9 in
length alt=12.93 m
span main=51 ft 3 in
span alt=15.62 m
height main=13 ft 10 in
height alt=4.22 m
area main=408 ft²
area alt=37.90 m²
empty weight main=15,997 lb
empty weight alt=7,271 kg
loaded weight main=
loaded weight alt=
max takeoff weight main=25,591 lb
max takeoff weight alt=11,632 kg
engine (prop)= Allison V-1710-143/145
type of prop= liquid-cooled V12 engines
number of props= 2
power main= 1,380 hp takeoff
power alt= kW each
max speed main=400 knots
max speed alt=460 mph, 740 km/h
max speed more=at 21,000 ft (6,400 m)
range main=1,950 nm
range alt=2,250 mi, 3,605 km
ceiling main=38,900 ft
ceiling alt=11,855 m
climb rate main=
climb rate alt=
loading main=
loading alt=
power/mass main=
power/mass alt=
guns=6× .50 in (12.7 mm) Browning M2 machine guns
rockets=25× 5 in (127 mm) rockets
bombs=4,000 lb (1,800 kg)

ee also

aircontent
related=
* P-51 Mustang
similar aircraft=
* de Havilland Mosquito
* de Havilland Hornet
* F7F Tigercat
* Heinkel He 111Z
* Heinkel He 219
* Messerschmitt Bf 109Z
* Messerschmitt Me 609
* P-61 Black Widow
see also=

References

Notes

Bibliography

* Baugher, Joe. "USAAS-USAAC-USAAF-USAF Aircraft Serial Numbers--1908 to present". [http://home.att.net/~jbaugher/usafserials.html USAF Serials] Retrieved: 9 January 2007.
* Davis. Larry. "F-82 Twin Mustang "(Squadron/Signal Mini In Action Series Number 8). Carrollton, Texas: Squadron/Signal Publications inc., 1996. ISBN 0-89747-367-1.
* McLaren, David R. "Double Menace: P-82 Twin Mustang". Colorado Springs, Colorado: VIP Aero Publishers Incorporated, 1996. ISBN 0-93457-512-6.
* Menard, David W. "USAF Plus Fifteen - A Photo History 1947 - 1962". Lancaster, Pennsylvania: Schiffer Books, 1993. ISBN 0-88740-483-9.
* Mondey, David. "The Concise Guide to American Aircraft of World War II." London: Chartwell Books, 1994. ISBN 0-7858-0147-2.
* Ravenstein, Charles A."Air Force Combat Wings Lineage and Honors Histories 1947-1977". Washington, DC: Office of Air Force History, 1984. ISBN 0-912799-12-9.
* Tanner, Kevin S. "The Inglewood Ghost". "Air Classics", Volume 44, number 7, July 2008.
* Thompson, Warren. "F-82: Killers over Korea." "AirEnthusiast Six", March-June 1978. Bromley, Kent, UK: Pilot Press Ltd., 1978.

External links

* [http://www.angelfire.com/oh3/pmodels/f82.html F-82 Twin Mustang]
* [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2293 North American F-82 Twin Mustang]