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Polikarpov I-153 DM (Dopolnityelnyi Motor)

    Fighter/Ground Attack
Polikarpov's I-153 with the DM-4 fitted

    Engine: 1x Shvetsov M-62R 9-cylinder aircooled radial, making 900hp
    Wing Span: 10m
    Length: 6.17 m
    Height: 2,80 m
    Weight: Empty 1,375 kg / Loaded 1,902kg
    Maximum Speed: 365 km/h
    Ceiling: 10,700 m
    Range: 560 km
    Crew: 1
    Armament: 2x 20mm ShVAK cannons or 4x 12.7 UBS machine guns / 100 kg of bombs / 8x RS82"Katusha" rockets

The I-153 was a major redesign of the earlier I-15 and I-15bis, undertaken in late 1937. The new aircraft was fitted with retractable landing gear, an upper gull-wing and a more powerful engine, it was to prove to be the best and the last of the Polikarpov biplanes.

In September 1940 to increase the I-153 performance, one aircraft was fitted with 2x Merkulov DM-4 ramjets mounted under the lower wings. After a number of test flights at the Central Airfield from September to October 1940, this combinded powered aircraft accelerated to over 440 km/h at 2,000m on the 27/10/1940. But even this could not save the Soviet Biplanes from thier fate, as this form of mixed power was considered unsuitable for a biplane.

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