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Gnome-Rhône 18L




The Gnome et Rhône 18L was a French-designed twin-row 18-cylinder air-cooled radial engine. The 18L was a large step up in terms of displacement, power and number of cylinders. The majority of Gnome-Rhone engines were either 7, 9 or 14 cylinders. The engine proved not to be a success, and it was dropped in 1939 due to a poor power-to-weight ratio. The American and British 18-cylinder engines proved lighter, smaller and generally more reliable.


Gnome Rhone 18L
Type: 18-cylinder twin-row air-cooled radial engine
Bore: 146 mm (5.75 in)
Stroke: 180 mm (7.09 in)
Displacement: 54.2 L (3,308 cu in)
Height: 1,400 mm (55.12 in)
Dry weight: 736 kg (1,622 lbs)
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Supercharger: Yes
Fuel system: 1 Bronzania Carburetor
Fuel type: 87 octane
Cooling system: air
Power output: 1,300 hp at 2,150 rpm
Compression ratio: 6.1:1
Power-to-weight ratio: 0.8 hp/lb at cruise speed



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