X24 engine

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X24 engine simplified cross-section

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 1,750 hp (1,300 kW) Vulture X-24 based on the Peregrine (which was itself a highly developed Kestrel).[1] 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 1,100 hp (820 kW) for use in naval aircraft.[2] Development work on all these engines ended in 1941 as Rolls-Royce concentrated on the Griffon and Merlin.[3]

Developed by Italy, the development of the Isotta Fraschini Zeta R.C. 24/60 of 1,250 hp (930 kW) was curtailed due to the Italian armistice.[4] Meanwhile, in Germany, the substantially larger 2,500 hp (1,900 kW) Daimler-Benz DB 604, intended for use in the Bomber B program, was cancelled on instructions from RLM in 1942.[5]

In the Soviet Union the large (1.47 m (4 ft 10 in)[6] or 1.95 m (6 ft 5 in)[7] 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 he MB-100 wasn't reliable and consumed almost 500 kg (1,100 lb) of fuel per hour, weighed1,250 kg (2,760 lb) and developed 2,200 hp (1,600 kW) (nominal) in 1942 and 2,400 / 3,200 hp (1,800 / 2,400 kW) (nominal/take-off) by 1945.


  1. ^ Jackson, Robert (2006). Men of Power: The Lives of Rolls-Royce Chief Test Pilots Harvey and Jim Heyworth. Barnsley: Pen & Sword Aviation. p. 61. ISBN 1-8441-5427-0.
  2. ^ Gunston, Bill (1989). World Encyclopaedia of Aero Engines. Sparkford: Patrick Stephens. p. 142. ISBN 1-85260-163-9.
  3. ^ Pugh, Peter (2000). The Magic of a Name: The Rolls-Royce Story, the First 40 Years. Cambridge: Icon books. p. 263. ISBN 1-8404-6151-9.
  4. ^ Green, William; Swanborough, Gordon (1994). The Complete Book of Fighters: An Illustrated Encyclopedia of Every Fighter Aircraft Built and Flown. New York: Smithmark Publishers. p. 110. ISBN 0-8317-3939-8.
  5. ^ von Gersdorff, Kyrill (2006). "Piston Aeroengines - Technological Milestones in Development". In Hirschel, Ernst Heinrich; Prem, Horst; Madelung, Gero (eds.). Aeronautical Research in Germany: From Lilienthal until Today. Springer. p. 216. ISBN 978-3-642-18484-0.
  6. ^ "Ер-2 с двигателями МБ-100". www.airpages.ru (in Russian). Retrieved 28 August 2018.
  7. ^ "Самолеты ОКБ В. Г. Ермолаева". Archived from the original on March 29, 2010. Retrieved March 7, 2011.