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I-3
Role	Fighter aircraft
National origin	Soviet Union
Manufacturer	Mikoyan-Gurevich
First flight	1956 (I-3U)
Number built	1 x I-3, 1 x I-3P, 1 x I-3U (rebuild from I-3)
Developed into	Mikoyan-Gurevich I-7

The Mikoyan-Gurevich I-3 was the first of three interrelated fighter prototype programs developed by the Mikoyan-Gurevich design bureau in the Soviet Union in the mid/late 1950s – starting with the I-3, continuing with the I-7 and finally evolving into the I-75. On several occasions airframes were rebuilt and/or reused, both within a program or in a succeeding program. All the aircraft in the I-3 program were affected by delays in the development of the Klimov VK-3 afterburning bypass turbojet engine, and its cancellation and replacement by the Lyulka AL-7F turbojet engine.

Design and development

Both the I-3 and I-3P were ordered by the Council of Ministers on June 3, 1953 – the I-3 as a frontline fighter and the I-3P as an all-weather interceptor. They were developed in parallel with the I-1/2 program but had nothing in common with it except a similar wing.^[1] On the other hand, the I-3's visual appearance was so similar to the Sukhoi S-1 (the Su-7 prototype) that a common design specification and fundamental research source seems likely.^[2] Compared to the Mikoyan-Gurevich MiG-19 the I-3U was slightly larger and heavier, but aerodynamically very similar.^[3]

Variants

I-3 (I-380)

The I-3 had a longer forward fuselage compared to the I-1 and the cockpit was positioned further ahead of the 60 degree swept wing.^[2] Armament consisted of three 30 mm Nudelman-Richter NR-30 cannon, each with 65 rounds – one in the left wing root and two on the right side.^[1] The Klimov VK-3 turbojet was never provisioned or fitted to the airframe. In 1956 the I-3 was converted into the I-3U.^[2]

I-3P

Developed in parallel with the I-3, but equipped with the same Almaz search radar as the I-1. Armament consisted of two 30 mm Nudelman-Richter NR-30 cannon. In addition, two ORO-57K rocket launchers, each with 16 55 mm ARS-57 (S-5) unguided rockets or two 190 mm TRS-190 unguided rockets or two 212 mm ARS-212 unguided rockets or two 250 kg bombs could be carried on pylons under the wing.^[4] Development was halted in late 1954.^[1]

I-3U (I-5)

The I-3U was modified from the unfinished I-3; the fuselage was stretched 93 cm (from 12.27 m to 13.20 m), the nose redesigned to accommodate the Uragan-1 fire control system (hence the U in the designation) above the inlet and an Almaz search radar with a search/track range of 17 km was fitted in the cone centered in the inlet.^[1] Armament consisted of two 30 mm Nudelman-Richter NR-30 cannon with symmetrical auto ranging connected to the radar.^[1] In addition to the fire control system, Mikoyan-Gurevich also used, for the first time, titanium alloys in the rear fuselage where high temperatures were expected.^[3] The conversion from I-3 to I-3U was completed in 1956.^[1]

Flight testing took place on an irregular basis in 1956–1958 due to engine flaws and frequent modifications. A total of 34 test flights were carried out,^[4] with design bureau test pilot Georgiy Mossolov reaching a speed of 1960 km/h at attitude on one flight.^[3] The program was cancelled on June 17, 1958.^[4]

Specifications (I-3U)

Data from ^{[citation needed]}

General characteristics

Crew: 1
Length: 15.78 m (51 ft 9 in)
Wingspan: 8.98 m (29 ft 6 in)
Wing area: 30 m² (320 sq ft)
Empty weight: 6,447 kg (14,213 lb)
Gross weight: 8,600 kg (18,960 lb)
Max takeoff weight: 10,028 kg (22,108 lb)
Powerplant: 1 × Klimov VK-3 afterburning turbojet engine, 82.4 kN (18,500 lbf) thrust

Performance

Maximum speed: 1,960 km/h (1,220 mph, 1,060 kn)
Maximum speed: Mach 1.59
Range: 1,290 km (800 mi, 700 nmi)
Service ceiling: 18,800 m (61,700 ft)

Armament

- 2 × 30 mm Nudelman-Rikhter NR-30 autocannon

References

^ ^a ^b ^c ^d ^e ^f Gunston, Bill. The Osprey Encyclopaedia of Russian Aircraft 1875–1995. London, Osprey, 1995. ISBN 1-85532-405-9
^ ^a ^b ^c Nemecek, Vaclav. The History of Soviet Aircraft from 1918. London, Willow Books, 1986. ISBN 0-00-218033-2.
^ ^a ^b ^c Butowski, Piotr with Miller, Jay. OKB MIG. Leicester, Midland, 1991. ISBN 0-904597-80-6
^ ^a ^b ^c http://ruslet.webnode.cz/technika/ruska-technika/letecka-technika/a-i-mikojan-a-m-i-gurjevic/i-3-i-380-/ (retrieved on 2011-04-05)