VD-4, V.Dobrynin (OKB-36)

Ultimate piston engine, developed from M-251TK. It was designed for long range heavy bombers, 24 cylinders were arranged in 4 raws. Engine diameter - 1.4m, length (with TK-36 supercharger and gearbox) - 2.5m. Powerplant was a success, but rapid progress of turbojets and turboprops chased those monsters from the scene.
Team of OKB-36 was awarded Stalin's Price in 1951 for this engine.
Designation on development stage - M-253K.
References
  • "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.2 p.372-374;

  • VD-4K 1949? 24cyl l.c. 3800/4300hp
    Tu-85
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