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Pogo oscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability. [1] The unstable combustion results in variations of engine thrust, causing variations of acceleration on the vehicle's flexible structure, which in turn cause variations in propellant pressure and flow rate, closing the self-excitation cycle.
Apollo 8 launched on December 21, 1968, and was the second crewed spaceflight mission flown in the United States Apollo space program (the first, Apollo 7, stayed in Earth orbit). Apollo 8 was the third flight and the first crewed launch of the Saturn V rocket.
In August 2014, it was revealed that parts of two different F-1 engines were recovered, one from Apollo 11 and one from another Apollo flight, while a photograph of a cleaned-up engine was released. Bezos plans to put the engines on display at various places, including the National Air and Space Museum in Washington, D.C. [ 29 ]
Apollo 8 Lunar Module Pilot Gen. William Anders, speaks to reporters in front of the Saturn 5 Aft End, the F-1 rocket engines of the first stage of the Apollo 11/Saturn 5 launch vehicle July 20 ...
Apollo 8, originally scheduled for 1969, was pushed forward because of concerns the Russians were accelerating their own plans for a trip around the moon by the end of 1968.
The first three lunar missions (Apollo 8, Apollo 10, and Apollo 11) used a free return trajectory, keeping a flight path coplanar with the lunar orbit, which would allow a return to Earth in case the SM engine failed to make lunar orbit insertion. Landing site lighting conditions on later missions dictated a lunar orbital plane change, which ...
Apollo 13 was slated to be the third landing on the moon after Apollo 8 (1968) and Apollo 12 (1969). Launched on April 11, 1970, the crew was led by commander Lovell, along with command module ...
Second uncrewed test flight; J-2 engine problems caused early shutdown of two engines in second stage, and prevented third stage restart. SA-503 Apollo 8: December 21, 1968 12:51:00 39A First crewed flight; first trans-lunar injection of Apollo command and service module. SA-504 Apollo 9: March 3, 1969 16:00:00 39A