Gnome-Rhône 18L
# 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.

## Specifications (Gnome Rhone 18L-00)

Data from Flight:POWER at the SALON

### General characteristics

* Type: 18-cylinder twin-row air-cooled radial engine
* Bore: 146 mm (5.7 in)
* Stroke: 190 mm (7.5 in)
* Displacement: 54.2 L (3,310 cu in)
* Height: 1,400 mm (55 in)
* Dry weight: 736 kg (1,623 lb)

### Components

* Valvetrain: 1 inlet and 1 exhaust valve per cylinder
* Supercharger: Yes
* Fuel system: 1 Bronzania Carburetor
* Fuel type: 87 octane
* Cooling system: air
* Reduction gear: 0.684:1

### Performance

* Power output: 970 kW (1,300 hp) at 2,170 rpm at 3,400 m (11,000 ft); 1,000 kW (1,400 hp) max
* Compression ratio: 5.5:1
* Power-to-weight ratio: 0.8 hp/lb at cruise speed
