Fiat A.82

The Fiat A.82 was an air cooled radial engine with 18 cylinders developed by the Italian engineering company Fiat and produced in small numbers during World War II. It was one of the most powerful aircraft engines produced in Italy and the culmination of series of successively larger engines developed from the A.74.

A.82
Fiat A.82 R42
Type Air cooled 14 cylinder radial aircraft engine
National origin Italy
Manufacturer Fiat
First run 1938
Major applications Fiat BR.20bis
Developed from Fiat A.80

Design and development

The A.82 was a more powerful development of the A.80 which powered the Breda Ba.65 and Fiat BR.20. The engine was a conservative 18 cylinder radial, consisting of two rows of nine cylinders with steel barrels and aluminium heads.[1] The largest Italian engine design of the time, each cylinder had a bore of 140 mm (5.5 in) and stroke of 170 mm (6.7 in).[2]

The engine was produced in two versions, the RC.40 of 1,250 hp (932 kW) and the RC.42 of 1,400 hp (1,044 kW), and saw limited operational service.[3] In addition to the fifteen Fiat BR.20bis operated by the Regia Aeronautica, Fiat also used the engine to power design studies like their BR.26 torpedo bomber.[4]

Variants

A.82 R.C.40 
With reduction gear and supercharger, rated altitude 4,000 m (13,000 ft).
A.82 R.C.42 
With reduction gear and supercharger, rated altitude 4,200 m (13,800 ft).
A.82 R.C.42S 

Applications

Specifications (R.C.42)

Data from Wilkinson, 1945.[1]

General characteristics

  • Type: 18-cylinder, two row, air cooled radial engine
  • Bore: 140 mm (5.5 in)
  • Stroke: 170 mm (6.7 in)
  • Displacement: 47.1 l (2,874 in3)
  • Length: 1,500 mm (59 in)
  • Diameter: 1,350 mm (53 in)
  • Height: 1,000 mm (39 in)
  • Dry weight: 870 kg (1,920 lb)
  • Garelli compressed air starter

Components

Performance

  • Power output:
    • Take-off: 1,400 hp (1,044 kW) at 2400 rpm
    • Normal: 1,250 hp (932 kW) at 2300 rpm at 4,200 m (13,800 ft)
    • Cruise: 950 hp (708 kW) at 1900 rpm at 4,500 m (14,800 ft)
  • Compression ratio: 6.5:1
  • Fuel consumption: 0.48 lb/hp/hr (220 g/kW/hr)
  • Oil consumption: 0.022 lb/hp/hr (10 g/kW/hr)

See also

Comparable engines

Related lists

References

Citations

  1. Wilkinson 1945, p. 293.
  2. Wilkinson 1940, p. 73.
  3. Gunston 2006, p. 63.
  4. Masimo 2011, pp. 22–23.
  5. Thompson 1963, p. 142.

Bibliography

  • Gunston, Bill (2006). World Encyclopedia of Aero Engines. Stroud: Sutton Publishing. ISBN 0-7509-4479-X.
  • Masino, Giovanni (2011). "Fantasmi di aerie e motori Fiat dal 1935 al 1945 (prime parte)". Ali Antiche (in Italian) (106): 16–24.
  • Thompson, Jonathan (1963). Italian Civil and Military Aircraft, 1930–1945. Los Angeles: Aero Publishers. ISBN 1-2584-4296-5.
  • Wilkinson, Paul Howard (1940). "Italian Air-Cooled Engines". Aviation. November: 72–73. Retrieved 12 June 2019.
  • Wilkinson, Paul Howard (1945). Aircraft Engines of the World. New York: Paul H. Wilkinson. Retrieved 12 June 2019.
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