Fiat A.74

{{Infobox Aircraft Begin

|name= A.74

|image = File:Fiat A.74 RIC38.jpg

|caption = Preserved Fiat A.74 R.I.C.38 engine

}}

{{Infobox Aircraft Engine

|type= Radial engine

|national origin = Kingdom of Italy

|manufacturer= Fiat

|first run= 1937

|major applications= Fiat CR.42 Falco
Fiat G.50 Freccia
Macchi C.200 Saetta

|number built =

|developed from =

|developed into = Fiat A.80

|variants with their own articles =

}}

The Fiat A.74 was a two-row, fourteen-cylinder, air-cooled radial engine produced in Italy in the 1930s as a powerplant for aircraft. It was used in some of Italy's most important aircraft of World War II.

Design and development

The A.74 marked a transition for Fiat from liquid-cooled inline engines, to large air-cooled radial engines. Fiat had made a number of smaller radial air engines over the years but the A.74 marked a major increase in power and size. The A.74 family was widely produced and spawned a number of related engines such as the A.76, A.80, and A.82, each successive generation being larger and more powerful than the previous. The entire series grew from 14 cylinders to 18 cylinders with a power output of 870 hp to 1,400 hp.

Variants

;A.74 R.C.18: With reduction gear and supercharger, rated altitude {{convert|1800|m|ft|abbr=on}}.

;A.74 R.C.38: With reduction gear and supercharger, rated altitude {{convert|3800|m|ft|abbr=on}}.

;A.74 R.C.38D:

;A.74 R.C.38S:

;A.74 R.I.C.38: With reduction gear, fuel injection and supercharger, rated altitude {{convert|3800|m|ft|abbr=on}}.

;A.74 R.C.42: With reduction gear and supercharger, rated altitude {{convert|4200|m|ft|abbr=on}}.

Applications

Specifications (A.74)

{{pistonspecs

|

|ref=[http://issuu.com/icar2011/docs/fiat_a.74_mr_parte_1 A.74 engine manual]

|type=14-cylinder air-cooled radial

|bore=140 mm (5.512 in)

|stroke=145 mm (5.709 in)

|displacement=31.25 L (1,906.9 cu in)

|length=1,044mm (41.13 in)

|diameter=1,195 mm (47.05 in)

|height=

|weight=590 kg (1,246 lb)

|valvetrain=One intake and one sodium-cooled exhaust valve per cylinder

|supercharger=

|turbocharger=

|fuelsystem=1 Stromberg carburettor

|fueltype=87 octane

|oilsystem=

|coolingsystem=air-cooled

|power=870 cv (858 hp, 640 kW) at 2,520 rpm at sea level (take-off power); 960 cv (947 hp, 706 kW) at 2520 rpm at 3,000 m (Emergency power) [http://issuu.com/icar2011/docs/fiat_a.74_mr_parte_1 A.74 engine manual]

|specpower=

|compression=6.7:1

|fuelcon=

|specfuelcon=

|oilcon=

|power/weight=1.2 kW/kg (0.73 hp/lb)

}}

References

[http://www.oldengine.org/members/diesel/Duxford/data01.htm oldengine.org] {{Webarchive|url=https://web.archive.org/web/20070314003852/http://www.oldengine.org/members/diesel/Duxford/data01.htm |date=2007-03-14 }}

Category:Aircraft air-cooled radial piston engines

A.74

Category:1930s aircraft piston engines