title: Rotex Electric REB 90
text: # Rotex Electric REB 90
  
  The Rotex Electric REB 90 is a Czech electric motor for powering electric aircraft, designed and produced by Rotex Electric of Prague.
  
  ## Design and development
  
  The REB 90 is a brushless 350 volt design producing 80 kW (107 hp). The low working rpm of 1800-2400 means that it can turn a propeller at efficient speeds without the need for a reduction drive.
  
  ## Specifications (REB 90)
  
  Data from Tacke and manufacturer
  
  ### General characteristics
  
  * Type: Brushless electric aircraft engine
  * Length: 212 mm (8.3 in)
  * Diameter: 270 mm (10.6 in)
  * Dry weight: 20 kg (44.1 lb)
  
  ### Components
  
  * Cooling system: air or liquid
  * Reduction gear: none
  
  ### Performance
  
  * Power output: 80 kW (107 hp) at 2400 rpm
  * Voltage: V nominal
  * Power-to-weight ratio: 4.0 kW/kg
  