|Parked USAF F-89J.|
|Primary user||United States Air Force|
|Unit cost||US$801,602 (F-89D)|
The Northrop F-89 Scorpion was an early American jet-powered all-weather interceptor. It has the distinction of being the first aircraft armed with nuclear weapons (the Genie missile) for air-to-air use.
The Scorpion stemmed from a 1945 United States Army Air Forces specification for a jet-powered night fighter to replace the P-61 Black Widow. Lockheed submitted a modified version of the T-33 to be produced as the F-94A. Northrop submitted a proposal labeled N-24, a slim-bodied aircraft with a cantilevered mid-mounted wing and two Allison J35 turbojet engines with afterburners. It was to have radar and a crew of two, with an armament of six 20 mm cannon in a unique trainable nose turret. Contracts for two prototypes were issued in December 1946.
The initial XP-89 prototype made its first flight on 16 August 1948, with test pilot Fred C. Bretcher. A unique feature added to the prototype during development was the deceleron, a two-part aileron that could split open to act as an air brake; this feature was to become a Northrop trademark, still used today on the B-2 Spirit.
Production was authorized in January 1949, with the first production F-89A entering USAF service in September 1950. It had AN/APG-33 radar and an armament of six T-31 20 mm cannon with 200 rounds per gun. The swiveling nose turret was abandoned, and 300 US gallon (1,100 L) fuel tanks were permanently fitted to the wingtips. Underwing racks could carry 16 five-inch aerial rockets or up to 3,200 lb (1,455 kg) of bombs.
Only eight F-89As were completed before the type was upgraded to F-89B standard, with new avionics. These had considerable problems with engines and other systems, and soon gave way to the F-89C. Despite repeated engine changes, problems persisted, compounded by the discovery of structural problems with the wings that forced a refit of 194 -A, -B, and -C models.
The major production model was the F-89D, which first flew 23 October 1951 and entered service in 1954. It removed the cannon in favor of a new Hughes E-6 fire control system with AN/APG-40 radar and an AN/APA-84 computer. Armament was two pods of 52 2.75 in (70 mm) "Mighty Mouse" FFAR rockets, for a total of 104. A total of 682 were built.
Proposed re-engined F-89s, designated F-89E and F-89F, were not built, nor was a proposed F-89G that would have used Hughes MA-1 fire control and GAR-1/GAR-2 Falcon air-to-air missiles like the F-102 Delta Dagger.
The subsequent F-89H, which entered service in 1956, had an E-9 fire control system like that of the early F-102 and massive new wingtip pods each holding three Falcons (usually three semi-active radar homing GAR-1s and three infrared GAR-2s) and 21 FFARs, for a total of six missiles and 42 rockets. Problems with the fire control system delayed the -H's entry into service, by which time its performance was notably inferior to newer supersonic interceptors, so it was phased out of USAF service by 1959.
The final variant was the F-89J. This was based on the F-89D, but replaced the standard wingtip missile pod/tanks with 600-gal fuel tanks and fitted a pylon under each wing for a single MB-1 Genie nuclear rocket (sometimes supplemented by up to four conventional Falcon air-to-air missiles). The F-89J became the first and only aircraft to fire a live Genie as the John Shot of Operation Plumbbob on 19 July 1957. There were no new-build F-89Js, but 350 -Ds were modified to this standard. They served with the ADC through 1959 and with the Air National Guard through 1969.
A total of 1,050 Scorpions of all marks were produced.
18 complete F-89's are currently on display in the United States.
- F-89B s/n 49-2434 on display at the USAF History and Traditions Museum in San Antonio, Texas
- F-89D s/n 52-1862 on display at Tyndall Air Park, Tyndall Air Force Base, Florida
- F-89D s/n 52-1959 on display at the Air Force Test Center Museum, Edwards Air Force Base, California
- F-89D s/n 53-2463 on display at the Museum of Aviation, Warner Robbins Air Force Base, Georgia
- F-89D s/n 53-2494 on display at the Vermont Air National Guard, 158th Fighter Group, Burlington, Vermont
- F-89H s/n 54-0298 on display at Dyess Linear Air Park, Dyess Air Force Base, Texas
- F-89H s/n 54-0322 on display at the Hill Aerospace Museum, Hill Air Force Base, Utah
- F-89H s/n displayed as 53-2677 at the Minnesota Air Guard Museum, Minneapolis, Minnesota
- F-89J s/n 52-1911 on display at the National Museum of the United States Air Force, Wright-Patterson Air Force Base, Dayton, Ohio
- F-89J s/n 52-1927 on display at the Castle Air Museum, Atwater, California
- F-89J s/n 52-1941 on display at the Peterson Air & Space Museum, Peterson Air Force Base, Colorado
- F-89J s/n 52-1949 on display at the March Field Air Museum, Riverside, California
- F-89J s/n 52-2129 on display at the Air Power Park and Museum, Hampton, Virginia
- F-89J s/n 53-2463 on display at the Museum of Aviation, Warner Robbins Air Force Base, Georgia
- F-89J s/n 53-2465 on display at the North Dakota Air National Guard, 119th Fighter Group, Fargo, North Dakota
- F-89J s/n 53-2547 on display at the Montana Air National Guard, 120th Fighter Group, Great Falls, Montana. This jet fired the live Genie described above.
- F-89J s/n 53-2610 on display at the USAF Armament Museum, Eglin Air Force Base, Florida
- F-89J s/n 53-2674 on display at the Pima Air & Space Museum, Tucson, Arizona
- Second prototype.
- One off prototype to test the Allison YJ71 engine.
- Proposed version, never built.
- Proposed version, never built.
- F-89As converted into drone control aircraft.
- F-89Bs converted into drone control aircraft.
- Crew: 2
- Length: 53 ft 10 in (16.4 m)
- Wingspan: 60 ft 5 in (18.4 m)
- Height: 17 ft 6 in (5.3 m)
- Wing area: 606 ft² (56.3 m²)
- Empty weight: 24,200 lb (11,000 kg)
- Loaded weight: 42,250 lb (19,200 kg)
- Max takeoff weight: 46,800 lb (21,200 kg)
- Powerplant: 2× Allison J35-A-35A afterburning turbojets
- Dry thrust: 5,600 lbf (24.9 kN) each
- Thrust with afterburner: 7,400 lbf (32.9 kN) each
- Maximum speed: 636 mph (553 knots, 1,020 km/h)
- Range: 1,367 mi (1,188 nm, 2,200 km)
- Service ceiling: 49,200 ft (15,000 m)
- Rate of climb: 8,360 ft/min (42.5 m/s)
- Wing loading: 69.7 lb/ft² (340.4 kg/m²)
- Thrust/weight: 0.35
- 104× 70 mm (2.75 in) "Mighty Mouse" folding-fin aerial rockets
- 16× 127 mm (5 in) aerial rockets on underwing racks or
- Bombs: 3,200 lb (1,500 kg)
- Knaack, Marcelle Size (1978). Encyclopedia of US Air Force aircraft and missile systems. Office of Air Force History.
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