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The heart of the engine was the thrust chamber, which mixed and burned the fuel and oxidizer to produce thrust. A domed chamber at the top of the engine supplied liquid oxygen to the injectors, which directed fuel and oxidizer into the thrust chamber for mixing and combustion. An incredibly volatile chamber that had to be tested to perfection. While the Apollo 6 launch was a bit shaky, when they launched the rocket again with its first human crew on Apollo 8, they had fixed the pogo problem.The crew of three made it safely to the moon and back. By the time Apollo 11 launched to the moon in July of 1969, the Saturn V was flying smoothly. During the remaining Apollo missions and subsequent launches the Saturn V and F-1 engines never experienced a failure. It was perfect, and the F-1 engine still holds the record as the largest single-chamber, single-nozzle liquid fuel engine ever flown.As NASA looks to manned missions to the moon and mars, they are developing a new rocket called Space Launch System (SLS). It will require a modern version of the F-1 and NASA engineers have even pulled an old F-1 engine out of storage to learn how to build the next big thing even better by studying this incredible engine with a perfect flying record.