Fiat A.82
| A.82 | |
|---|---|
| |
| Fiat A.82 R42 | |
| Type | Air cooled 18 cylinder radial aircraft engine |
| National origin | Italy |
| Manufacturer | Fiat |
| First run | 1938 |
| Major applications | Fiat BR.20bis |
| Developed from | Fiat A.80 |
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. It was used as the power plant for one operational aircraft, the Fiat BR.20bis.
Design and development
First run in 1938, the A.82 was a more powerful development of the A.80, itself derived from the A.74, which powered the Breda Ba.65 and Fiat BR.20. It was claimed to be 50% more powerful than its antecedents.[1] It was the largest production Italian engine design of the time.[2]
The A.82 was an 18 cylinder radial, consisting of two rows of nine cylinders arranged in a double star with a triple throw crankcase made of aluminium alloy.[3] Each cylinder had the same bore as the A.40 at 140 mm (5.5 in) but an increased stroke of 170 mm (6.7 in). They had steel barrels and aluminium alloy heads. Fuel was mixed in a Zenith-Stromberg downdraught carburettor.[4]
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.[5] 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.[6][7]
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).
Applications
- Fiat BR.20bis (R.C.42)
Specifications (R.C.42)
Data from Wilkinson, 1945.[4]
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
- Valvetrain: Two valves per cylinder driven by pushrods
- Supercharger: Single stage, mechanical, 8.65:1
- Fuel type: Gasoline
- Cooling system: Air-cooled
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
- Alfa Romeo 135
- Bristol Hercules
- Nakajima Homare
- Piaggio P.XXII
- Pratt & Whitney R-2800 Double Wasp
- Tumansky M-90
Related lists
References
Citations
- ^ Automotive Industries 1938, p. 31.
- ^ Wilkinson 1940, p. 73.
- ^ Flugsort 1941, p. 319.
- ^ a b Wilkinson 1945, p. 293.
- ^ Gunston 2006, p. 63.
- ^ Masino 2011, pp. 22–23.
- ^ Thompson 1963, p. 142.
Bibliography
- "New Fiat aircraft engine". Automotive Industries. 76 (1): 31. 1 January 1938.
- "Fiat A 82 RC 42 S Flugmotor". Flugsport (in German) (16): 319–320. 1941.
- Gunston, Bill (2006). World Encyclopedia of Aero Engines. Stroud: Sutton Publishing. ISBN 0-7509-4479-X.
{{cite book}}: Invalid|ref=harv(help) - Masino, Giovanni (2011). "Fantasmi di aerei e motori Fiat dal 1935 al 1945 (prime parte)". Ali Antiche (in Italian) (106): 16–24.
{{cite journal}}: Invalid|ref=harv(help) - Thompson, Jonathan (1963). Italian Civil and Military Aircraft, 1930–1945. Los Angeles: Aero Publishers. ISBN 1-2584-4296-5.
{{cite book}}: Invalid|ref=harv(help) - Wilkinson, Paul Howard (1940). "Italian Air-Cooled Engines". Aviation. November: 72–73. Retrieved 12 June 2019.
{{cite journal}}: Invalid|ref=harv(help) - Wilkinson, Paul Howard (1945). Aircraft Engines of the World. New York: Paul H. Wilkinson. Retrieved 12 June 2019.
{{cite book}}: Invalid|ref=harv(help)