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A view of one of the five engines powering the Saturn-V Rocket.

The F-1 is a gas-generator cycle engine developed in the U.S. by Rocketdyne in the late 1950s and used in the Saturn-V rocket in the 1960s and into the early 1970s. Five F-1 engines were used in the S-IC first stage of each Saturn-V, which served as the main launch vehicle of the Apollo program. The F-1 remains the most powerful single-combustion chamber liquid-propellant rocket engine ever developed. (Source: 'Wikipedia')