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Fiat A.25

1920s Italian piston aircraft engine

1920s Italian piston aircraft engine

FieldValue
nameA.25
imageFIAT A. 25.jpg
engine_typeWater cooled V-12
manufacturerFiat Aviazione
national_originItaly
first_runc.1924
number_builtseveral hundred

The Fiat A.25 was an Italian water-cooled aircraft engine from the 1920s. It produced 708 kW (950 hp) and was used by the Regia Aeronautica for fifteen years to power their Fiat BR.2 and BR.3 bombers.

Design and development

During the 1920s Fiat introduced several water-cooled aircraft engines, including the A.20, A.22, A24, A.25 and A.30. They were all upright V-12s with 60° between the cylinder banks; capacities ranged between 18.7 L and 54.5 L (1,141-3,324 cu in) and power outputs between 320 kW and 745 kW (430-1,000 hp).

Producing 710 kW (950 hp) from 54.5 L (3,324 cu in), the A.25 was the largest and most powerful in the range. When Fiat were advised by the government to simplify their water-cooled product line, they focussed on the A.20, A.22 and A.30 models, so the A.25 was not further developed. They concentrated their higher power development effort on radial engines instead.

Operational history

The only series produced types powered by the A.25 were the Fiat BR.2 and BR.3 single engine bombers. These began operating with the Regia Aeronautica in 1925. Some, used as trainers, were still in service in 1939.

Applications

  • Fiat BR.2
  • Fiat BR.3
  • Fiat BR.4

Specifications

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  • Pistons: Aluminium alloy, two compression rings and one scraper ring above a fully floating gudgeon pin, with a second scraper ring below it.
  • Crankshaft: Each six throw, seven bearings.
  • Crankcase: Each an aluminium casting, split on crankshaft centre line. Bolted-on duralumin end caps.

References

References

  1. Grey, C.G.. (1972). "Jane's All the World's Aircraft 1938". David & Charles.
  2. Gunston, Bill. (1989). "World Encyclopaedia of Aero Engines". Patrick Stephens Ltd.
  3. Taylor, Michael J. H.. (1989). "Jane's Encyclopedia of Aviation". Portland House.
  4. Thompson, Jonathan. (1963). "Italian Civil and Military Aircraft 1930-1945". Aero Publishers, Inc.
  5. (25 July 1929). "OLYMPIA: some of the stands - Fiat".
Info: Wikipedia Source

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