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|F-1 at Misawa Base (1994)|
|Role||close air support, ground-attack and anti-ship jet aircraft.|
|Manufacturer||Mitsubishi Heavy Industries, Fuji Heavy Industries|
|First flight||3 June 1975|
|Primary user||Japan Air Self Defense Force|
|Developed from||Mitsubishi T-2|
The Mitsubishi F-1 is Japan's first post-World War II domestically developed and built supersonic military jet, to enter production in Japan since the end of World War II, thus it was nicknamed "Supersonic Rei-Sen". Mitsubishi Heavy Industries and Fuji Heavy Industries jointly developed the F-1. At first glance, it resembles the French/Anglo SEPECAT Jaguar, but was a completely independent Japanese effort (although it uses the same engines). Its primary role is anti-ship attack, secondary role is ground attack, and it has limited air-to-air capabilities (short-range AIM-9 Sidewinder for self-defense).
Design and development
In the mid 1960s, the Japan Air Self-Defense Force (JASDF) commenced studies into an advanced jet trainer which could also be modified to serve in the ground attack and anti-shipping roles. After considering license production of the T-38 Talon and SEPECAT Jaguar, Japan decided to develop its own trainer, the supersonic Mitsubishi T-2, this first flying on 20 July 1971. Cost over-runs in the T-2 program led to the proposed single seat attack version almost being abandoned, but the cancellation of the Kawasaki P-XL, the planned replacement for Japan's Kawasaki P-2J maritime patrol aircraft freed-up funds, while making it important to keep Japan's aviation industry employed, and contracts were awarded for the development of the attack version as the FS-T2kai in 1973.
The new aircraft was a minimum change derivative of the T-2, with the rear cockpit being converted to an avionics bay by removing the rear seat, and replacing the canopy with a simple unglazed access hatch. Two additional hardpoints were fitted under the wing to allow carriage of a heavier weapon load, and the avionics were improved, with a new J/AWG-12 radar set, similar to that fitted in British Royal Air Force F-4M Phantom fighter jets. This set provides ranging information. Aside from the avionics changes, deletion of the rear seat, and new one-piece canopy, the only other major change from the T-2 was the strengthening of the airframe to enable it to carry a larger weapons load than the T-2. The F-1 is fitted with an internally mounted 20 mm JM61A1 Vulcan cannon with 750 rounds of ammunition. The aircraft also has seven external hardpoints for the carriage of a wide variety of stores. The fuselage hardpoint and inboard pair of underwing hardpoints are "wet", which means they can be used to carry external fuel tanks to increase the aircraft's range. The primary weapon of the F-1 is the ASM-1 and the newer ASM-2 long-range anti-ship missile. This weapon is roughly in the class of the American AGM-84 Harpoon or French AM.39 Exocet. Other weapons carried include the all-aspect short-range heat-seeking AIM-9 Sidewinder air-to-air missile for air-to-air combat. This weapon is carried on the wingtip rails usually, but it can also be carried on the outboard underwing hardpoints for the F-1's secondary air defense role. Other air-to-ground weapons carried include rocket pods (JLAU-3/A) of 70 mm (2.75 in) size as well as bombs of 227 kg (500 lb) and 340 kg (750 lb) in size (Mk82 and M117 respectively). In addition, the Mk-82 and M117 bombs can be fitted with infrared guidance kits, turning them into precision-guided weapons that home in on heat radiation emitted from seaborne targets such as ships or other ground-based targets. When fitted with this kit, the bomb becomes known as GCS-1.
The F-1 was replaced by the F-2 (Japan/U.S. developed, based on F-16C/D), as well as upgraded F-4EJ "Kai" Phantom IIs. The last six active F-1s, based at Tsuiki in Fukuoka Prefecture, were retired on 9 March 2006, having reached the 4,000 hour limit of their airframes.
- FS-T2-Kai: The first two prototypes.
- Mitsubishi F-1: Single-seat close air support, ground-attack and anti-ship fighter aircraft.
Data from Mitsubishi's Sabre Successor 
- Crew: 1
- Length: 17.86 m (58 ft 7 in)
- Wingspan: 7.88 m (25 ft 10¼ in)
- Height: 4.48 m (14 ft 8⅓ in)
- Wing area: 21.2 m² (228 ft²)
- Empty weight: 6,358 kg (14,017 lb)
- Max. takeoff weight: 13,674 kg (30,146 lb)
- Powerplant: 2 × Ishikawa-Harima TF40-801A turbofan
- Dry thrust: 22.8 kN (5,115 lbf) each
- Thrust with afterburner: 35.6 kN (7,305 lbf) each
- Maximum speed: 1,700 km/h (918 knots, 1,056 mph) at 11,000 m (36,100 ft) (clean)
- Combat radius: 556 km (483 nmi, 346 mi) High-Low-High profile with two ASM-1 missiles and one 830 L (183 Imp gallon) drop tank
- Ferry range: 2,870 km (1,552 nmi, 1,785 mi) (max external fuel)
- Service ceiling: 15,240 m (50,000 ft)
- Rate of climb: 118 m/s (35,000 ft/min)
- Wing loading: 645 kg/m² (132 lb/ft²)
- Climb to 11,000 m (36,100 ft): 2.0 min
- Guns: 1× 20 mm (0.787 in) JM61A1 Vulcan 6-barreled Gatling cannon
- Hardpoints: One, centerline, four underwing and two wingtip missile rails
- Bombs: Various bombs, air-to-air and air-to-surface missiles and rocket pods on four underwing, two wingtip, and one underfuselage pylon. Weapons carried include AIM-9 Sidewinder, Mitsubishi AAM-1, Mitsubishi Type 80 Air-to-Ship Missile/Type 93 Air-to-Ship Missile anti-ship missiles, JLAU-3A 70 mm rocket pods, RL-7 70 mm rockets, RL-4 125 mm rockets, Mk-82 500 lb and M117 750 lb bombs, and GCS-1, IR-guided versions of the Mk-82 and M117.
- Related development
- Aircraft of comparable role, configuration and era
- Lake 1995, pp. 52–53.
- Sekigawa 1980, pp. 117–120.
- Lake 1995, p.53.
- Sekigawa 1980, pp. 120–121.
- Lake 1995, p.68.
- Sekigawa 1980, p.130.
- Michell 1994, p.128.
- Eden, Paul (ed.). The Encyclopedia of Modern Military Aircraft. London: Amber Books, 2004. ISBN 1-904687-84-9.
- Lake, Jon. "Mitsubishi F-1: Ship-killing Samurai". World Air Power Journal, Volume 23, Winter 1995. London:Aerospace Publishing. ISBN 978-1-874023-64-7. ISSN 0959-7050. pp. 50–71.
- Michell, Simon (editor). Jane's Civil and Military Aircraft Upgrades 1994-95. Coulsdon, UK: Jane's Information Group, 1994. ISBN 0-7106-1208-7.
- Sekigawa, Eiichiro. "Mitsubishi's Sabre Successor". Air International, March 1980, Vol 18 No 3. Bromley, UK:Fine Scroll. ISSN 0306-5634. pp. 117–121, 130–131.
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