Polikarpov I-6
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Polikarpov I-6

With acceptance of the I-3 for series production, Polikarpov and his team commenced work on a smaller, lighter fighter, the I-6, powered by a 450hp Gnome- Rhone Jupiter VI air-cooled radial. A single-bay, unequal- span biplane of wooden construction with fabricskinned wings and a monocoque fuselage, the I-6 was flown on 30 March 1930, two prototypes appearing in the annual May Day fly-past over Moscow in that year. Prior to the commencement of flight testing, Polikarpov had been arrested (in September 1929), accused of "exercising insufficient energy in bringing assigned work to fruition", and, together with Dmitri P Grigorovich, was already working whilst in detention on a further fighter (see I-5). Comparative trials were subsequently performed between the I-6 and the I-5, the latter being selected for series manufacture after prolonged evaluation. The I-6 was the faster in level flight, but offered a poorer rate of climb and was less manoeuvrable. Development was therefore discontinued in favour of the I-5.

Polikarpov I-6A three-view drawing (1280 x 864)

    Take-off weight1280 kg2822 lb
    Empty weight868 kg1914 lb
    Wingspan9.70 m32 ft 10 in
    Length6.78 m22 ft 3 in
    Wing area20.50 m2220.66 sq ft
    Max. speed280 km/h174 mph
    Range700 km435 miles

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