This video features the XCOR XR-5M15 7,500 lb-thrust LOX Methane rocket engine in a series of short tests strung together in a compilation. This is the 'heat sink' nozzle version of the engine, which is used to characterize engine performance. The results were be used to determine the appropriate length of the rocket engine chamber for the flight-weight regeneratively cooled version. br br The engine program is a collaboration between XCOR, ATK and NASA. For more information please visit our website at a class="link" rel="nofollow" href=" and NASA's related release at a class="link" rel="nofollow" href=" br br online too at VUZE beta (Azureus Inc.