Fiat AS.2
For the aircraft of the same name, see Fiat AS.2 (aircraft)
| AS.2 | |
|---|---|
| 300px | |
| Type | Piston V-12 aero engine |
| Manufacturer | Fiat Aviazione |
| First run | c.1925 |
| Major applications | Macchi M.39 |
| Developed from | Fiat A.22 |
| Developed into | Fiat AS.3 |
The Fiat AS.2 was an Italian 12-cylinder, liquid-cooled V engine designed and built in the mid-1920s by Fiat Aviazione especially for the 1926 Schneider Trophy air race.[1]
Contents
Design and development
Designed for the 1926 Schneider Trophy contest held at Hampton Roads, Virginia, the AS.2 was inspired by the American Curtiss D-12 engine. Unlike the D-12 the engine featured separate steel cylinders and cast aluminium alloy cylinder heads.[2] The starting point for the Italian engine was the earlier Fiat A.22.[3] The 'S' in AS stood for 'Spinto' (thrust). A weakness of the engine was its magnesium alloy pistons, a new engineering material at the time. Many pistons were holed. Despite the engine's technical problems it was successful at the Schneider Trophy event, winning on 13 November 1926, with a second AS.2 powered aircraft placing third.[4]
Applications
Specifications (AS.2)
Data from Eves[5]
General characteristics
- Type: 12-cylinder V-engine
- Bore: 140 mm (5.5 in)
- Stroke: 170 mm (6.7 in)
- Displacement: 30.955 litres (1,889 cu in)
- Width: 720 mm
- Height: 850 mm
- Dry weight: 408 kg (900 lb)
Components
- Valvetrain: Two intake and two exhaust valves per cylinder
- Fuel system: Carburettor
- Cooling system: Liquid-cooled
Performance
- Power output: 596 kW (800 hp) at 2,500 rpm
- Compression ratio: 6:1
- Power-to-weight ratio: 1.46 kW/kg (0.9 hp/lb)
See also
- Comparable engines
- Related lists
References
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Notes
Bibliography
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- Eves, Edward The Schneider Trophy Story. Shrewsbury. Airlife Publishing Ltd., 2001. ISBN 1-84037-257-5.
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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