Fiat AS.5
The Fiat AS.5 was an Italian 12-cylinder, liquid-cooled V engine designed and built in the late-1920s by Fiat especially for the 1929 Schneider Trophy air race. On entering later series production the engine was known as the A.30RA.[1]
Design and development
For the 1929 Schneider Trophy contest Fiat planned a new seaplane to counter the British challengers from Gloster and Supermarine. To minimise frontal area they chose a compact V-12 engine design that set new size standards for a 1,000-horsepower (750 kW) class engine. This unsupercharged engine had a high power-to-weight ratio due to the use of a high compression ratio and a special fuel blend containing a 50/50 mix of petrol and benzole.[2]
A problem encountered with the AS.5 was the high revolutions that it developed its power at, lacking a propeller reduction gearbox great care had to be taken with the choice of propellers. The production version did feature a reduction gear.[3] The AS.5 was developed into the AS.6, essentially a tandem-coupled combination of two AS.5 units.
Applications
Specifications (AS.5)
Data from Gunston[1]
General characteristics
- Type: 12-cylinder V-engine
- Bore: 138 mm (5.4 in)
- Stroke: 140 mm (5.5 in)
- Displacement: 25.545 litres (1,589 cu in)
- Dry weight: 348 kg (767 lb)
Components
- Valvetrain: Two intake and two exhaust valves per cylinder
- Fuel system: Carburettor
- Cooling system: Liquid-cooled
Performance
See also
- Related development
- Comparable engines
- Related lists
References
Notes
- ^ a b Gunston 1989, p. 57.
- ^ Eves 2001, p. 216.
- ^ Eves 2001, p. 217.
Bibliography
- 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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