title: Hirth F-263
text: # Hirth F-263
  
  The Hirth F-263 is a twin cylinder, in-line, two stroke, carburetted aircraft engine that was designed for use on ultralight aircraft. It was manufactured by Hirth of Germany, but was discontinued about 2001.
  
  ## Development
  
  The F-263 uses fan cooling and piston-ported induction, with a single Bing carburetor and single capacitor discharge ignition. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start. A gearbox reduction drive system and electric start were factory options.
  
  The engine produces 31 hp (23 kW) and runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil. Recommended time between overhauls is 1000 hours.
  
  ## Applications
  
  * Howland H-3 Pegasus
  * Falconar HM-293
  
  ## Specifications (F-263)
  
  Data from Cliche
  
  ### General characteristics
  
  * Type: Twin cylinder, two-stroke, aircraft engine
  * Displacement: 383 cc (23.4 cu in)
  * Dry weight: 70 lb (31.8 kg)
  
  ### Components
  
  * Valvetrain: piston-ported
  * Fuel system: 1 X Bing carburetor
  * Fuel type: unleaded 93 octane auto fuel
  * Oil system: 50:1 fuel/oil premix
  * Cooling system: fan forced air
  * Reduction gear: optional gearbox
  
  ### Performance
  
  * Power output: 30 hp (22 kW)
  