Fiat A.74: Difference between revisions
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{{short description|1930s Italian piston aircraft engine}} |
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{|{{Infobox Aircraft Begin |
{|{{Infobox Aircraft Begin |
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|name= A.74 |
|name= A.74 |
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|image = |
|image = File:Fiat A.74 RIC38.jpg |
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|caption = Preserved Fiat A.74 |
|caption = Preserved Fiat A.74 R.I.C.38 engine |
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}} |
}} |
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{{Infobox Aircraft Engine |
{{Infobox Aircraft Engine |
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|type= [[Radial engine]] |
|type= [[Radial engine]] |
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|national origin = |
|national origin = [[Kingdom of Italy]] |
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|manufacturer= [[Fiat]] |
|manufacturer= [[Fiat]] |
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|first run= |
|first run= 1937 |
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|major applications= |
|major applications= [[Fiat CR.42 Falco]]<br>[[Fiat G.50 Freccia]]<br>[[Macchi C.200 Saetta]] |
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|number built = |
|number built = |
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|program cost = |
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|unit cost = |
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|developed from = |
|developed from = |
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|developed into = |
|developed into = [[Fiat A.80]] |
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|variants with their own articles = |
|variants with their own articles = |
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}} |
}} |
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==Design and development== |
==Design and development== |
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The A.74 |
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. |
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==Variants== |
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;A.74 R.C.18: With reduction gear and supercharger, rated altitude {{convert|1800|m|ft|abbr=on}}. |
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;A.74 R.C.38: With reduction gear and supercharger, rated altitude {{convert|3800|m|ft|abbr=on}}. |
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;A.74 R.C.38D: |
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;A.74 R.C.38S: |
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;A.74 R.I.C.38: With reduction gear, fuel injection and supercharger, rated altitude {{convert|3800|m|ft|abbr=on}}. |
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;A.74 R.C.42: With reduction gear and supercharger, rated altitude {{convert|4200|m|ft|abbr=on}}. |
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==Applications== |
==Applications== |
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*[[Fiat G.50]] |
*[[Fiat G.50]] |
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*[[Fiat RS.14]] |
*[[Fiat RS.14]] |
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*[[Ikarus Orkan]] |
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*[[IMAM Ro.57]] |
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*[[Macchi C.200]] |
*[[Macchi C.200]] |
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|displacement=31.25 L (1,906.9 cu in) |
|displacement=31.25 L (1,906.9 cu in) |
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|length=1,044mm (41.13 in) |
|length=1,044mm (41.13 in) |
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|diameter= |
|diameter=1,195 mm (47.05 in) |
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|height= |
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|width=653mm (25.71 in) |
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| |
|weight=590 kg (1,246 lb) |
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|weight=565 kg (1,246 lb) |
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|valvetrain=One intake and one sodium-cooled exhaust valve per cylinder |
|valvetrain=One intake and one sodium-cooled exhaust valve per cylinder |
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|supercharger= |
|supercharger= |
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|turbocharger= |
|turbocharger= |
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|fuelsystem=1 [[Stromberg |
|fuelsystem=1 [[Bendix-Stromberg pressure carburetor|Stromberg]] carburettor |
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|fueltype=87 octane |
|fueltype=87 octane |
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|oilsystem= |
|oilsystem= |
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|specfuelcon= |
|specfuelcon= |
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|oilcon= |
|oilcon= |
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|power/weight=0. |
|power/weight=1.2 kW/kg (0.73 hp/lb) |
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}} |
}} |
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<!-- designs which were developed into or from this aircraft: --> |
<!-- designs which were developed into or from this aircraft: --> |
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|related= |
|related= |
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* [[Fiat A.80]] |
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<!-- aircraft that are of similar role, era, and capability as this design: --> |
<!-- aircraft that are of similar role, era, and capability as this design: --> |
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|similar aircraft= |
|similar aircraft= |
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<!-- For aircraft engine articles. Engines that are of similar to this design: --> |
<!-- For aircraft engine articles. Engines that are of similar to this design: --> |
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|similar engines= |
|similar engines= |
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* [[Alfa Romeo 135]] |
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* [[BMW 801]] |
* [[BMW 801]] |
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* [[Bristol Hercules]] |
* [[Bristol Hercules]] |
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| ⚫ | |||
* [[Wright R-2600]] |
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* [[Gnome-Rhône 14N]] |
* [[Gnome-Rhône 14N]] |
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* [[Mitsubishi Kinsei]] |
* [[Mitsubishi Kinsei]] |
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* [[Nakajima Sakae]] |
* [[Nakajima Sakae]] |
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* [[Piaggio P.XI]] |
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* [[Piaggio P.XIX]] |
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| ⚫ | |||
* [[Shvetsov ASh-82]] |
* [[Shvetsov ASh-82]] |
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* [[Tumansky M-88]] |
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<!-- See [[WP:Air/PC]] for more explanation of these fields. --> |
<!-- See [[WP:Air/PC]] for more explanation of these fields. --> |
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==References== |
==References== |
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{{commons category}} |
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{{commonscat}} |
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* [http://www.oldengine.org/members/diesel/Duxford/data01.htm oldengine.org] |
* [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 }} |
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<references /> |
<references /> |
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{{Fiat aeroengines}} |
{{Fiat aeroengines}} |
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{{Aviation lists}} |
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[[Category:Aircraft air-cooled radial piston engines]] |
[[Category:Aircraft air-cooled radial piston engines]] |
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[[Category:Fiat aircraft engines|A.74]] |
[[Category:Fiat aircraft engines|A.74]] |
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[[Category: |
[[Category:1930s aircraft piston engines]] |
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Latest revision as of 20:56, 4 November 2023
| A.74 | |
|---|---|
| |
| Preserved Fiat A.74 R.I.C.38 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 |
| Developed into | Fiat A.80 |
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
[edit]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
[edit]- A.74 R.C.18
- With reduction gear and supercharger, rated altitude 1,800 m (5,900 ft).
- A.74 R.C.38
- With reduction gear and supercharger, rated altitude 3,800 m (12,500 ft).
- 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 3,800 m (12,500 ft).
- A.74 R.C.42
- With reduction gear and supercharger, rated altitude 4,200 m (13,800 ft).
Applications
[edit]Specifications (A.74)
[edit]Data from A.74 engine manual
General characteristics
- 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)
- Dry weight: 590 kg (1,246 lb)
Components
- Valvetrain: One intake and one sodium-cooled exhaust valve per cylinder
- Fuel system: 1 Stromberg carburettor
- Fuel type: 87 octane
- Cooling system: air-cooled
Performance
- Power output: 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) [1]
- Compression ratio: 6.7:1
- Power-to-weight ratio: 1.2 kW/kg (0.73 hp/lb)
See also
[edit]Related development
Comparable engines
- Alfa Romeo 135
- BMW 801
- Bristol Hercules
- Gnome-Rhône 14N
- Mitsubishi Kinsei
- Nakajima Sakae
- Piaggio P.XI
- Piaggio P.XIX
- Pratt & Whitney R-1830 Twin Wasp
- Shvetsov ASh-82
- Tumansky M-88
Related lists
References
[edit]
Wikimedia Commons has media related to Fiat A.74.
- oldengine.org Archived 2007-03-14 at the Wayback Machine