2   06-08-2010, 11:22 PM Rhyshaelkan Unconcerned...   Join Date: Jul 2009 Location: Michigan, USA Posts: 568 SpaceX designed a good first stage with their Merlin engines. "At full power, the Merlin Vacuum engine generated 411,000 N (92,500 lbs force) of thrust, and operated with the greatest efficiency ever for an