The Deschamps were 12-cylinder, inverted-V Diesel engines that gave 1,200 CV at 1,600 rpm, evolving to 1,600 CV.

“Two Deschamps engine views”

-We see that it has two mechanical superchargers at the rear. They used a part of bleed air to ventilate the smoke inside the engine.

"Comparison"

-It had a pneumatic starter that injected compressed air into the cylinders. To assist, a line of cylinders was decompressed.

-For running at idle, feed was cut to one of the two injectors on each cylinder.

-This engine is contemporary of Daimler, MAN, etc. Its frontal area was very small due to its V of 30°. It was designed for seaplanes, patrol boats, etc.

-The last figure shows a comparison of frontal areas with radials of equivalent powers.

From Appendix 9: The V-3050, an inverted-V Diesel engine, was made around 1934.

"Engine cross-section"

"V-3050"

"Rotary valve version"