Merlin 1г—1 -

: The first to feature a regeneratively cooled nozzle and combustion chamber. It powered the first privately developed rocket to reach orbit (Falcon 1 Flight 4) and early Falcon 9 flights.

: Uses a triple-redundant flight computer system on each engine to ensure high reliability during launch. Merlin 1Г—1

: One center Merlin engine is fired during the final landing burn to enable first-stage vertical landings. : The first to feature a regeneratively cooled