The Junkers Jumo 223 was an experimental 24-cylinder

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...

based on the

Junkers Jumo 205 The Jumo 205 aircraft engine was the most numerous of a series of aircraft diesel engines produced by Junkers. The Jumo 204 first entered service in 1932. Later engines of this type comprised the experimental Jumo 206 and Jumo 208, with the Ju ...

. Like the Jumo 205, it was an opposed piston two-stroke diesel engine. It had four banks of six cylinders in a

rhomboid Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled. The terms "rhomboid" and "parallelogram" are often erroneously conflated with each oth ...

configuration, with four

crankshaft A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...

s, one at each vertex of the rhombus, and 48 pistons. It was designed for a power of 2,500 horsepower at 4,400 rpm, and weighed around 2,370 kg.Gunston, p. 82 Only one example is known to have been built. It is rumoured to have been taken to

Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...

at the end of

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

, where development may have continued.

Jumo 224

In 1942 the 223 was abandoned in favour of an even larger engine, the Jumo 224 with an intended output power of 4,500 horsepower. The Jumo 223 series was influential to the successful three-crankshaft

Napier Deltic The Napier Deltic engine is a British opposed-piston valveless, supercharged uniflow scavenged, two-stroke diesel engine used in marine and locomotive applications, designed and produced by D. Napier & Son. Unusually, the cylinders were di ...

engine.

References

Bibliography

* * * *

External links

Multi-crankshafts opposed piston engines (2)

Old Machine Press' Junkers Jumo 223 engine page

OpposedpistonEngines.com's Jumo 223 Page
{{Junkers Jumo aeroengines Aircraft diesel engines Two-stroke diesel engines Opposed piston engines Junkers aircraft engines 1940s aircraft piston engines Abandoned military aircraft engine projects of Germany