The X-24 is one of the few configurations of X-type engines known to have been produced. The design consists of four banks of six cylinders with a common crankshaft. This is lighter than other multi-bank designs, which require multiple crankshafts. Few of the X-24 engines developed saw service, and their production lifetimes were very limited. Postwar developments of the

turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...

and

turbofan A turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a combination of references to the preceding generation engine technology of the turbojet and the add ...

engines obviated the need for large piston aircraft engines of this type. In the United Kingdom,

Rolls-Royce Rolls-Royce (always hyphenated) may refer to: * Rolls-Royce Limited, a British manufacturer of cars and later aero engines, founded in 1906, now defunct Automobiles * Rolls-Royce Motor Cars, the current car manufacturing company incorporated in ...

produced the Vulture X-24 based on the Peregrine (which was itself a highly developed Kestrel). The Peregrine proved troublesome, and the Vulture inherited many of the Peregrine's problems, as well as some of its own, and proved unsuccessful. The company also developed the smaller

Exe Exe or EXE may refer to: * .exe, a file extension * exe., abbreviation for Executive (disambiguation)#Role, title, or function, executive Places * River Exe, in England * Exe Estuary, in England * Exe Island, in Exeter, England Transportation a ...

of for use in naval aircraft. Development work on all these engines ended in 1941 as Rolls-Royce concentrated on the Griffon and Merlin. In

Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...

, the development of the Isotta Fraschini Zeta R.C. 24/60 of was curtailed due to the Italian armistice. Meanwhile, in Germany, the substantially larger Daimler-Benz DB 604, intended for use in the Bomber B program, was cancelled on instructions from the RLM in 1942. In the

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

the large ( or wide) Dobrotvorskiy MB-100 was developed in 1942 and mounted on a Yermolayev Yer-2 bomber. The construction was based on duplication of Klimov VK-105 V-12 engines, but the MB-100 wasn't reliable and consumed almost of fuel per hour, weighed and developed (nominal) in 1942 and (nominal/take-off) by 1945.

References

{{Piston engine configurations Piston engine configurations X engines