Fiat AS.5

AS.5
Type Piston V-12 aero engine
Manufacturer Fiat
First run c.1929
Major applications Fiat C.29
Developed into Fiat AS.6

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.[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 that it developed maximum power at high crankshaft speeds (3,000 rpm) but lacked output gearing, so that 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

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

  1. ^ a b Gunston 1989, p. 57.
  2. ^ Eves 2001, p. 216.
  3. ^ 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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