The Aerojet Rocketdyne (formerly Rocketdyne and later Pratt & Whitney Rocketdyne) RS-68 (Rocket System 68) is a liquid-fuel rocket engine that uses liquid hydrogen (LH2) and liquid oxygen (LOX) as propellants in a gas-generator power cycle.
===Primerljivi motorji===* RS-68* Rocketdyne J-2* Aerojet Rocketdyne RS-25 - SSME, glavni motor na Space shuttlu* RD-0120* Primerjava raketnih motorjev==Reference====Zunanje povezave==* Arianespace – Ariane 5: Cryogenic Main Stage and Solid Boosters* Ariane 5 ECA and Snecma – Snecma Moteurs: Vulcain 2 engine proves its mettle* – Volvo Aero* – Volvo Aero* – Volvo Aero* – Volvo Aero* – Volvo Aero* – Volvo Aero* EADS N.V. – EADS welcomes contract signature for 30 Ariane 5 launchers at ILA 2004 in Berlin* Three billion Euros contract for 30 Ariane 5 launchers – EADS Astrium