Rocket Engines
Our rocket engines are built to customer specifications.  Below is a selection of engines that illustrate some of our capabilities.  Click on any engine class to learn more. (listed by order of thrust)

• XR-2P1 15 lbf N2O-Ethane
  R&D and educational, variable propellants and third fluid injections
   
• XR-3E17 56 lbf N2O-Ethane
  Stationkeeping - storable
   
• XR-3B4 50 lbf N2O-Isopropyl
  Stationkeeping - storable
  
  
• XR-3M9 50 lbf LOX-Methane
  Stationkeeping - storable
   
• XR-4A3 400 lbf LOX-Alcohol
  Auxilliary or primary propulsion
   
• XR-4K14 1,500 lbf LOX-Kerosene
  Primary propulsion, 'Rocket Racer' engine
   
• XR-4K5 1,800 lbf LOX-Kerosene
  Primary propulsion
   
• XR-5K18 2,700 lbf LOX-Kerosene
  Primary propulsion, Lynx
   
• XR-5M15 7,500 lbf LOX-Methane
  Primary propulsion, space storable

Click here to visit the XR-4K14 media gallery

XR-4K14, 1,500 lbf LOX/kerosene Engine

The 4K14 is one of XCOR's most recent engine designs, and was built specifically for the Rocket Racing League's first X-Racer. The rocket engine is sized for 1,500 lbf, which is the best compromise between acceleration and endurance for the airframe used with this engine.

XCOR’s proprietary fuel pump used with this engine demonstrates the ability to pump from an unpressurized tank. The unpressurized wing tanks hold fuel, which improves performance significantly compared to an all pressure-fed system. Most rocket pumps require relatively high tank pressures (60-100 psi) to force the propellant into the pump. However, this piston pump is able to draw propellant with a much lower inlet pressure so no fuel tank pressurization is required.

The 4K14 engine uses a regulated helium pressurization system for the LOX tank that is very similar to the one on the EZ-Rocket.