Part 9/12:
By 2018, SpaceX launched Falcon Heavy, integrating three Falcon 9 boosters with a total of 27 engines. Mueller, watching from the sidelines, regarded this as one of his proudest moments, symbolizing the culmination of years of engineering effort and innovation.
The Next Generation: Starship and Beyond
Mueller’s influence persisted as he assumed roles expanding SpaceX’s technological frontier. Transitioning to CTO of propulsion, he contributed to the development of the Raptor engine—methane-powered, high-performance engines intended for interplanetary travel aboard Musk’s Starship.