This adjusts engine thrust during flight to optimise stage performance. Moon landing: Incredible pics reveal Neil Armstrong in pre-launch days, Staged Apollo 11 photos reveal behind-the-scenes of Moon landing, Moon landing date: The launch, landing and return of NASA's Apollo 11, Moon landing date: Apollo 11 launched on July 16, 1969. Guidance system goes on internal at 17 seconds leading up to the ignition sequence at 8.9 seconds. Booster says it's looking good at 5 minutes. To ensure ignition, a cartridge of fluid sits in a branch of the high pressure fuel circuit. S69-40640 - The Apollo 11 space vehicle rises from the launch pad. The interstage ullage rockets were eventually deleted from the later Saturn Vs. Ullage is a brewer's term for the space in a barrel taken up by air rather than liquor. The phrase 'guidance is internal' refers to the moment at T minus 17 seconds that the Saturn V's guidance system is no longer held in an orientation with respect to Earth. The sequence of events for the first ignition of the single J-2 engine in the third stage is essentially the same as for the engines in the S-II. Note the condensation cloud that has formed in air expanding aft of the first-stage/second-stage transition. At 3 minutes; downrange, 70 [nautical] miles [130 km]; 43 [nautical] miles high [80 km]; velocity, 9,300 feet per second [2,835 m/s]. On earlier Saturn V flights, it was noted how severe vibrations would build towards the end of the S-II burn. The solution adopted from Apollo 10 onwards was to shut that engine down before the vibrations were expected. At sea level, the atmosphere acts somewhat as a cap on an engine's nozzle, getting in the way of the exiting gases. It shows how the acceleration experienced by the crew varies over the course of the Saturn's ascent. These include a digital computer, an analogue flight computer and an gyroscopically stabilised platform mounted within three gimbals. Velocity 25,254 feet per second [7,697 km]. MPEG Video Format (1.3 M) Actually, it's just the one engine, the central engine in the cluster of J-2s.

Photo filed 21 March 1969 - Scan by Kipp Teague. For the first two abort modea, one-alpha and one-bravo, rotation rates exceeding ±4° per second in pitch and yaw, ±20° per second in roll will entail an abort. This is Mission Control, Houston. Max-Q occurs at 1 minute and 23 seconds into the flight. Scan by Kipp Teague. This is achieved using a theodolite located 210 metres directly south of the vehicle which shines a beam of light through a window in the skin of the IU and another in the casing that surrounds the platform. Lift-off under S-IC power. However, mathematical modelling had shown benefits to an open-loop decision, one based on the change in MR occurring when a specific velocity had been reached.

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