This is a scale model of the combustion chamber of a J-2X liquid-fuel cryogenic rocket engine that is planned for use on NASA's Constellation program and Space Launch System. The J-2X burns cryogenic liquid hydrogen & liquid oxygen propellants, with each engine producing 1,307 kN (294,000 lbf) of thrust in vacuum at a specific impulse (Isp) of 448 seconds (4.39 km/s). The engine's mass is approximately 5,450 pounds (2,470 kg), significantly heavier than its predecessors used to power the Saturn 5.A cool model for educators and enthusiasts...Enjoy Don't forget to visit our site http://www.creationengineering.co.uk for further information on our technology, research and creations. Don't forget to follow us on Twitter @bioprinting2 for further information on creation updates.