Is SpaceX's Raptor engine the king of rocket engines?
Merlin (rocket engine family) - Video Learning - WizScience.com
Raptor (rocket engine family) | Wikipedia audio article
Tom Mueller (SpaceX) Explains The Merlin Rocket Engine
Rutherford (rocket engine) | Wikipedia audio article
Merlin is a family of rocket engines developed by SpaceX for use on its Falcon 1, Falcon 9 and Falcon Heavy launch vehicles. Merlin engines use RP-1 and liquid oxygen as rocket propellants in a gas-generator power cycle. The Merlin engine was originally designed for sea recovery and reuse.