title: Emrax 228
text: # Emrax 228
  
  The Emrax 228 is a Slovenian electric motor for powering electric aircraft and other applications, designed and produced by Emrax d.o.o of Kamnik. The company was formerly called Enstroj and based in Radomlje.
  
  ## Design and development
  
  The Emrax 228 is a brushless 130 volt design producing a peak of 100 kW (134 hp), 55 kW (74 hp) continuous, with an outrunner coil. It has a 98% efficiency. The low working rpm of the engine means that it can turn a propeller at efficient speeds without the need for a reduction drive.
  
  ## Specifications (Emrax 228)
  
  Data from Tacke and manufacturer
  
  ### General characteristics
  
  * Type: Brushless electric aircraft engine
  * Length: 86 mm (3.4 in)
  * Diameter: 228 mm (9.0 in)
  * Dry weight: 12 kg (26.5 lb)
  
  ### Components
  
  * Coil type: Outrunner
  * Cooling system: air and/or liquid
  * Reduction gear: none
  
  ### Performance
  
  * Power output: 100 kW (134 hp) peak, 55 kW (74 hp) continuous
  * Voltage: 130V nominal
  * Best efficiency: 98%
  * Power-to-weight ratio: 8.3 kW/kg
  