title: Sauer S 1800 UL
text: # Sauer S 1800 UL
  
  The Sauer S 1800 UL is a four stroke aircraft engine designed for homebuilt and ultralight aircraft.
  
  ## Design and development
  
  The engine is based on the Volkswagen air-cooled engine. It is extensively modified for aircraft use and all the parts are custom made. The engine is derived from the certified engines produced by the same manufacturer and used in several motorgliders and small aircraft.
  
  ## Applications
  
  * Alpi Pioneer 200
  
  ## Specifications (variant)
  
  ### General characteristics
  
  * Bore: 92mm
  * Stroke: 69mm
  * Displacement: 1835cc
  * Dry weight: 63 kg
  
  ### Components
  
  * Valvetrain: Single overhead exhaust valve, single overhead inlet valve per cylinder
  * Fuel system: Bing carburetor with altitude compensation
  * Fuel type: min 95 RON
  * Cooling system: Air-cooled
  
  ### Performance
  
  * Power output: 68hp at 3200 rpm
  * Compression ratio: 8.5:1
  