title: Gnome-Rhône 18L
text: # 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
  