This would become one secret to SpaceX’s eventual dominance of the global launch market. Mueller said the original pump from Barber-Nichols weighed 150 pounds, with an output of about 3,000 horsepower. Over the next fifteen years, SpaceX engineers continued to iterate, changing the design and upgrading its parts. The turbopump in the modern-day Falcon 9 rocket’s Merlin engine still weighs 150 pounds, but produces 12,000 horsepower.
