Tupolev I-4

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The Tupolev I-4 (Development name ANT-5) was a Soviet fighter biplane. It was the first aircraft designed by Pavel Sukhoi.

ANT-5 was a prototype of I-4 sesquiplane single-seat fighter.

I-4 differed from ANT-5 by redesigned (to decrease drag) engine howling, added rocket launchers on upper wing and increased tailfin.

The lower wing was nothing more than an attachment for the wing struts; it was (almost) removed in the second series (I-4bis), used as a parasite fighter in Zveno experiments with TB-3 bomber.

The I-4 was the first Soviet all metal fighter.

One 480hp M-22 engine.

Total 369 were built.

In service in 1928-1933.

Development of 1927.

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Specifications (I-4)

General characteristics

Crew: one, pilot
Length: 7.28 m (23 ft 11 in)
Wingspan: 11.40 m (37 ft 5 in)
Height: m ( ft in)
Wing area: 23.8 m² (256 ft²)
Empty: 978 kg (2,156 lb)
Loaded: 1,430 kg (3,153 lb)
Maximum takeoff: kg ( lb)
Powerplant: 1× M-22, 358 kW (480 hp)

Performance

Maximum speed: 231 km/h (144 mph)
Range: 840 km (524 miles)
Service ceiling: 7,000 m (22,960 ft)
Rate of climb: 555 m/min (1,820 ft/min)
Wing loading: 60 kg/m² (12 lb/ft²)
Power/mass: 0.25 kW/kg (0.15 hp/lb)

Armament

2× 7.62 mm machine guns

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