Fiat A.70

A.70
Fiat A.70
Type	Air cooled 7-cylinder radial aircraft engine
National origin	Italy
Manufacturer	Fiat Aviazione
Designer	Tranquillo Zerbi
First run	1934

The Fiat A.70 was an air cooled radial engine with seven cylinders developed by the Italian engineering company Fiat Aviazione in the 1930s. The engine powered a number of Italian light competition and prototype aircraft.

Design and development

The A.70 was developed by Fiat Aviazione, part of Fiat S.p.A., as one of a number of related small radial engines. ^[1] It debuted at the Challenge International de Tourisme 1934, powering a number of the competitors. ^[2] The engine had seven cylinders of square design, with a bore and stroke of 115 mm (4.5 in), arranged around a crankshaft in a single row. ^[3] It was connected to the propeller by direct drive, often through a NACA cowling. ^[4]

Applications

• Breda Ba.42 ^[5]
• Caproni PS.1 ^[4]
• Fiat G.5 ^[6]
• Nardi FN.305 ^[7]
• Nardi FN.310 ^[7]

Specifications (A.70S)

Data fromNACA Technical Memorandum No.760. ^[3]

General characteristics

• Type: 7-cylinder, single row, air cooled radial engine
• Bore: 115 mm (4.5 in)
• Stroke: 115 mm (4.5 in)
• Displacement: 9.35 L (571 in³)
• Dry weight: 168 kg (370 lb)

Components

• Valvetrain: Two valves per cylinder
• Fuel type: Gasoline
• Cooling system: Air-cooled
• Reduction gear: Direct drive

Performance

• Power output: 200 hp (149 kW) at 2,300 rpm (max); 180 hp (134 kW) at 2,100 rpm (rated)
• Compression ratio: 5.8:1
• Power-to-weight ratio: 0.81 kg (1.8 lb) per hp

See also

Comparable engines

• Armstrong Siddeley Lynx
• Siemens-Halske Sh 14
• Warner Super Scarab

Related lists

• List of aircraft engines

References

Citations

1. Bridgman 1950, p. 520.
2. Schulz & Pleines 1934, p. 9.
3. Schulz & Pleines 1934, p. 11.
4. Thompson 1963, p. 99.
5. Thompson 1963, p. 28.
6. Thompson 1963, p. 162.
7. Thompson 1963, p. 214.

Bibliography

• Bridgman, Leonard (1950). Jane's All the World's Aircraft 1950-1951. London: Sampson Low, Marston.
• Gunston, Bill (2006). World Encyclopedia of Aero Engines. Stroud: Sutton Publishing. ISBN   0-7509-4479-X.
• Schulz, R.; Pleines, W. (1934). NACA Technical Memorandum No.760: Technical Aspects of the 1934 International Touring Competition (Rundflug) . Retrieved 17 November 2019.
• Thompson, Jonathan (1963). Italian Civil and Military Aircraft, 1930-1945. Los Angeles: Aero Publishers. ISBN   1-2584-4296-5.