title: Salmson B.9
text: # Salmson B.9
  
  The Salmson B.9 was a French designed, nine-cylinder, water-cooled radial aero engine that was produced under license in Britain. The engine was produced between August 1914 and December 1918. The French version was designated 9B with a slightly increased capacity variant known as the R.9 or 9R. A further variant known as the M.9 or 9M unusually drove the propeller through a 90-degree gear train.
  
  ## Variants
  
  ### Salmson B.9 (Salmson 9B)
  
      140 horsepower (104 kW)
  
  ### Salmson M.9 (Salmson 9M)
  
      120 horsepower (89 kW), 90-degree propeller drive
  
  ### Salmson R.9 (Salmson 9R)
  
      160 horsepower (119 kW, increased bore to 140 mm.
  
  ## Applications
  
  ### Salmson B.9
  
  * Farman F.27
  * Short Admiralty Type 135
  * Short Type C
  * Short 830
  * Voisin LA.S
  
  ### Salmson M.9
  
  * Blackburn Type L
  * Breguet U2
  * Voisin LA
  
  ### Salmson R.9
  
  * Farman F.27
  
  ## Engines on display
  
  * A watercooled, nine-cylinder Salmson engine is on public display at the London Science Museum.
  
  ## Specifications (B.9)
  
  Data from Lumsden.
  
  ### General characteristics
  
  * Type: Nine-cylinder, single-row, water-cooled radial engine
  * Bore: 122 mm (4.3 in)
  * Stroke: 140 mm (5.5 in)
  
  ### Components
  
  * Valvetrain: Two overhead valves per cylinder
  * Cooling system: Water-cooled
  * Reduction gear: Direct drive, left hand tractor, right hand pusher
  
  ### Performance
  
  * Power output: 104 kW (140 hp) at 1,250 rpm
  * Compression ratio: 5.16:1
  