title: MTH R 422-CG
text: # MTH R 422-CG
  
  The MTH R 422-CG is an Austrian aircraft engine, designed and produced by MTH Engines of Mattsee for use in ultralight aircraft.
  
  ## Design and development
  
  The engine is a twin-cylinder two-stroke, in-line, 1,339 cc (81.7 cu in) displacement, liquid-cooled, gasoline engine design, with a toothed mechanical gearbox reduction drive with a reduction ratio of 3.0:1. It employs dual electronic ignition systems and produces 105 hp (78 kW) at 6500 rpm, with a compression ratio of 12:1.
  
  ## Specifications (R 422-CG)
  
  Data from Tacke
  
  ### General characteristics
  
  * Type: Twin cylinder, two stroke aircraft engine
  * Bore: 99 mm (3.9 in)
  * Stroke: 87 mm (3.4 in)
  * Displacement: 1,339 cc (81.7 cu in)
  * Dry weight: 42 kg (92.6 lb)
  
  ### Components
  
  * Fuel type: gasoline
  * Cooling system: liquid
  * Reduction gear: toothed mechanical gearbox
  
  ### Performance
  
  * Power output: 105 hp (78 kW)
  