CNA C-7

The CNA C-7 was a small nine-cylinder supercharged, geared, single row radial engine designed in Italy in the early 1930s.^[1] Three light aircraft class world altitude records were set by the CNA C-7 powered Fiat AS.1 and CNA Eta.^[2]

C-7
Type	Nine-cylinder radial engine
National origin	Italy
Manufacturer	Compagnia Nazionale Aeronautica (CNA)

Applications

• CNA Beta^[3]
• CNA Eta
• Fiat AS.1

Specifications

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

General characteristics

• Bore: 80 mm (3.15 in)
• Stroke: 85 mm (3.35 in)
• Displacement: 3.85 L (235 cu in)
• Dry weight: dry 125 kg (276 lb)
• Construction: Aluminium cylinder heads and steel barrels. Cast "Elektron" metal crankcase.

Components

• Valvetrain: Two valves per cylinder. An overhead camshaft, driven by a bevel shaft running between each pair of cylinders operated the exhaust valve of one and the inlet valve of the next.
• Supercharger: Centrifugal blower running at crankshaft speed.
• Fuel system: 1× Memini carburetter
• Cooling system: Air
• Reduction gear: 3:1
• Ignition: Dual ignition: 2× Marelli plugs per cylinder, driven by a different Marelli magneto

Performance

• Power output: Normal 134 kW (180 hp) at 4,800 rpm
• Compression ratio: 7:1