CNA C.II

C.II
Type	Horizontally opposed air-cooled twin
National origin	Italy
Manufacturer	Compagnia Nazionale Aeronautica (CNA)
Produced	1937-41

The CNA C.II was a small, air-cooled, two cylinder horizontally opposed aircraft engine designed and built in Italy in the late 1930s.

Design

The low power, unsupercharged C.II had offset cylinders with special steel barrels and light alloy cylinder heads. The pistons were light alloy castings; the connecting rods were heat treated chrome-nickel steel, with split big ends. The CN.II had a one piece chrome-nickel steel crankshaft ruuning in two roller bearings, with a ball thrust bearing. The crankcase was a one piece light alloy casting.^[1]

Applications

Data from Erickson^[2]

• Alaparma AM-8
• Alaparma AM-9
• Alaparma AM-10
• Partenavia P.53 Aeroscooter

Specifications

Data from Jane's All the World's Aircraft 1938^[1]

General characteristics

• Bore: 90 mm (3.54 in)
• Stroke: 110 mm (4.33 in)
• Displacement: 1.4 L (85.4 cu in)
• Length: 478 mm (18.81 in)
• Width: 856 mm (33.70 in)
• Height: 526 mm (20.71 in)
• Dry weight: dry 42 kg (92.6 lb)

Components

• Valvetrain: Large diameter overhead valves, one inlet and one exhaust per cylinder. Enclosed rocker gear operated by push-rods driven off upper crankcase camshaft.
• Oil system: Wet sump; crankshaft fed pressurised oil by pump.
• Cooling system: Air

Performance

• Power output: rated 28 kW (38 hp) at 2,700 rpm at sea level

References

1. Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. p. 68d. ISBN 0715 35734 4.
2. Erickson, Jack. "Horizontally Opposed Piston Aero Engines: C.N.A.". Retrieved 21 March 2012.