DM-2 by A.Merkulov

Ramjet engine, used as booster on combat aircraft. Installed under the wing (lower on biplanes like I-152), pair of those engines provided ~20km/h of extra speed. But when engines were not operating, both speed and flight characteristics of the aircraft suffered severely due to additional drag (applied in the quite a wrong place).

More powerful DPM-4 in 1940 accelerated the I-153 to 440km/h at 2000m, but it was impossible to save biplane fighters from their faith.

Diameter40 cm
Length 150 cm
Weight 19kg
DM-2 1938 ramjet ?

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