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)
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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.