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Speaking at the Royal Aeronautical Society in London, SpaceX chief executive and lead rocket engineer Musk said Lox and methane would be SpaceX’s propellants of choice on a mission to Mars, which has long been his stated goal.
SpaceX’s initial work will be to build a Lox/methane rocket for a future upper stage, codenamed Raptor. The design of this engine would be a departure from the “open cycle” gas generator system that the current Merlin 1 engine series uses. Instead, the new rocket engine would use a much more efficient “staged combustion” cycle that many Russian rocket engines use.
See more and subscribe to NextBigFuture at 2012-11-23 16:41:57 Source: http://nextbigfuture.com/2012/11/spacex-will-make-methane-rocket-for-mars.html