Fiat AS.2

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For the aircraft of the same name, see Fiat AS.2 (aircraft)

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]

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

Macchi M.39

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)

References

Wikimedia Commons has media related to Fiat AS.2.

Notes

↑ Eves 2001, p. 214.
↑ Eves 2001, p. 243.
↑ Jane's All the World's Aircraft 1938
↑ Eves 2001, p. 243.
↑ Eves 2001, p. 215.

Bibliography

Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. p. 68-9d. ISBN 0715 35734 4.
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

v t e Fiat aircraft engines

Piston engines	A.10 A.12 A.14 A.15 A.18 A.20 A.22 A.24 A.25 A.30 A.50 A.53 A.54 A.55 A.58 A.59 A.60 A.70 A.74 A.76 A.78 A.80 A.82 AN.1 AS.2 AS.3 AS.5 AS.6 AS.8 SA8/75 S.55

Turbine engines	4002 4004 4301 4700

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