In 1946, Russian designer Vladimir A. Dobrynin made a 2,200 CV engine known as the VD-251 that was liquid cooled and had twelve cylinders in V.

-Being in the OKB Mikulin, he participated in the M-250 design together with Skuba Chevskyi. It was a radial with 6 blocks of four cylinders, 24 in total.

"Dobrynin M-250"

-Dobrynin developed the M-250 engine continuing with the VD-3 from 1945 derived from the M-250.

-The VD-3TK reached 3,500 CV. It was known as the M-251TK, and had 24 cylinders with turbochargers.

-VD-4 was a logical development from the VD-3TK, with
the VD-4TK (M-253K) reaching at 4,500 CV.

-Curiously it is claimed that the M-250's specific consumption was 165 grams x CV x Hr., When by the time, even decades later the "standard" consumption was 250 gr. x CV x Hr.

-We see the installation on board an aircraft, with turbocharger and its distribution.

"M-250 Power train"

-The Dobrynin design office passed to Koliesov in 1955. Shortly before this fact he designed the VD-7, a powerful engine of almost 25,000 lbs. of thrust.

-There were other variants (-B, -F, -M, -P and M-2). With afterburner the power went to 36,000 lbs.

-VD-5 and VD-9 are also Dobrynin engines.

"DV-7”(VD-7)

From Appendix 9: Designer V. Drobynin's Technical Office (OKB-36) was little known but inspired high-performance engines with great powers.

-The VD-3 was also the M-250. As the VD-3TK was the M-251TK (TK is for the turbocharger).

"VD-4K (M-253K)"

-The VD-4K is a complex and powerful engine, from 3,800 to 4,300 CV. It has six radially arranged blocks of 4 cylinders each. It is a Compound engine whose turbines, driven by the exhaust, add their power to the central shaft of the engine.

"Schematic diagram with turbocharger"

-The turbocharger is superimposed on top behind the main engine.

-The turbines between each two cylinder blocks are the "Compounds".

-The VD-5 was mounted on the Myasischev M-4. Without more information.

-The VD-5 was a turbine, but the most common Dobrynin turbine engine was the VD-7 and its variants such as the VD-7-BA (RD-7M2). Or the VD-9 on the Tu-106.

"Dobrynin VD-7B"

"Ten VD-7 engines on an Ekranoplane"

-The MB-100 was a horizontal-X piston engine, built by coupling two M-103s. It was a Dobrynin design and the engine gave 2,400 CV.