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Polikarpov 2I-N-1 / DI-1


The first two-seat fighter of indigenous Soviet design, the 2I-N1 (the designation signifying Dvukhmyestny istrebitel, or two-seat fighter, with one Napier engine) was a single-bay unequal-span biplane of wooden construction with a monocoque fuselage and a 450hp Napier Lion water-cooled engine. The sole prototype of the 2I-N1 (also referred to as the DI-1) was flown on 12 January 1926, and demonstrated a performance higher than that of contemporary single-seat fighters. Armament comprised one fixed 7.62mm gun and a similar calibre weapon on a ring mount in the rear cockpit. On 31 March 1926, high speed tests during the ninth flight terminated with the destruction of the aircraft as a result of a structural failure, no further development being undertaken.

Max take-off weight: 1700 kg / 3748 lb
Empty weight: 1153 kg / 2542 lb
Wingspan: 12.00 m / 39 ft 4 in
Length: 9.75 m / 32 ft 0 in
Wing area: 27.15 sq.m / 292.24 sq ft
Max. speed: 268 km/h / 167 mph


Polikarpov 2I-N1 (DI-1)



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