X24 engine
The X-24 is one of the few configurations of X-type engines known to have been produced. The design consists of a pairing of 4 banks of six cylinders with a common crankshaft, 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 and turbofan engines obviated the need for large piston aircraft engines of this type.
In the United Kingdom, Rolls-Royce produced the Vulture X-24 based on the Peregrine. The Peregrine proved troublesome, and the Vulture inherited many of the Peregrines problems, as well as some of its own, and proved unsuccessful. The company also developed the smaller Exe of for use in naval aircraft. Development work on all these engines ended in 1941 as Rolls-Royce concentrated on the Griffon and Merlin.
Developed by Italy, 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 RLM in 1942.
In the Soviet Union the large 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 he MB-100 wasn't reliable and consumed almost of fuel per hour, weighed and developed in 1942 and by 1945.
