page_title: North American F-82 Twin Mustang
section_title: Design and development
hierarchical_section_title: North American F-82 Twin Mustang / Design and development
caption_attribution_description: English: P-82 Twin Mustang fuselages in storage at North American Aircraft in 1947 and two jet engined FJ-1 Fury fuselages
context_page_description: The North American F-82 Twin Mustang is the last American piston-engine fighter ordered into production by the United States Air Force. Based on the North American P-51 Mustang, the F-82 was originally designed as a long-range escort fighter for the Boeing B-29 Superfortress in World War II. The war ended well before the first production units were operational.
  In the postwar era, Strategic Air Command used the planes as a long-range escort fighter. Radar-equipped F-82s were used extensively by the Air Defense Command as replacements for the Northrop P-61 Black Widow as all-weather day/night interceptors. 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, the first being a North-Korean Yak-11 downed over Gimpo Airfield by the USAF 68th Fighter Squadron.
context_section_description: Initially intended as a very long-range (VLR) escort fighter, the F-82 was designed to escort Boeing B-29 Superfortress bombers on missions exceeding 2,000 miles (3,200 km) from the Solomon Islands or Philippines to Tokyo, missions beyond the range of the Lockheed P-38 Lightning and conventional P-51 Mustangs. Such missions were part of the planned U.S. invasion of the Japanese home islands, which was forestalled by the surrender of Japan after the atomic bombings of Hiroshima and Nagasaki and the opening of Soviet attacks on Japanese-held territory in Manchuria.
  In October 1943, the North American Aircraft design team began work on a fighter design that could travel over 2,000 mi (3,200 km) without refueling. It consisted of a twin-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 a new design. North American Design Chief Edgar Schmued incorporated two P-51H Mustang fuselages lengthened by the addition of a 145 cm (57 in) 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 M3 Browning machine guns as a single-engine Mustang, but with more concentrated fire. The first XP-82 prototype (s/n 44-83886) was equipped with a removable centerline gun pod housing eight additional .50 caliber M3 Brownings, but this did not feature on production aircraft. An even more powerful centerline gun pod containing a 40 mm cannon was considered, but was never built. The outer wings were reinforced to allow the addition of hard points for carrying additional fuel or 1,000 pounds (450 kg) 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 conventional landing gear with both wheels retracting into bays under 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 an additional gear in the propeller reduction box to allow the left propeller to turn opposite to the right propeller, which was driven by 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 Forces on 30 August 1945, whose 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 its first flight.
  The XP-82 prototypes, and production 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 most versions of 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-Ro
caption: Twin Mustangs and two jet engined FJ-1 Furys in production at North American, 1948
exif: {"Image Make": "HP", "Image Model": "HP ojp7700", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "GIMP 2.8.10", "Image DateTime": "2014:04:15 17:52:39", "Image YCbCrPositioning": "Co-sited", "Image ReferenceBlackWhite": "[0, 255, 128, 255, 128, 255]", "Image ExifOffset": "242", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "300", "Thumbnail YResolution": "300", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1080", "Thumbnail JPEGInterchangeFormatLength": "9245", "Thumbnail YCbCrPositioning": "Co-sited", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2011:10:13 11:43:53", "EXIF ComponentsConfiguration": "YCbCr", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2410", "EXIF ExifImageLength": "1739", "Interoperability InteroperabilityIndex": "\u0002\u0002\u0002\u0002", "Interoperability InteroperabilityVersion": "[3, 0, 0, 0]", "EXIF InteroperabilityOffset": "938", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal", "EXIF DeviceSettingDescription": "[1, 0, 19, 0, 32, 32, 32, 48, 65, 48, 32, 32, 32, 55, 65, 48, 32, 32, 32, 56, ... ]"}