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Apollo Command Module primary guidance system components Apollo Lunar Module primary guidance system components Apollo Inertial Measurement Unit. The Apollo primary guidance, navigation, and control system (PGNCS, pronounced pings) was a self-contained inertial guidance system that allowed Apollo spacecraft to carry out their missions when communications with Earth were interrupted, either as ...
The ST-124-M3 inertial platform was a device for measuring acceleration and attitude of the Saturn V launch vehicle. It was carried by the Saturn V Instrument Unit , a 3-foot-high (0.91 m), 22-foot-diameter (6.7 m) section of the Saturn V that fit between the third stage (S-IVB) and the Apollo spacecraft.
IBM. "Instrument Unit System Description and Component Data." This lists, in Table 1, all components by name, part number, reference designation and location for IU-201 to -212 and IU-501 to -515. It also includes photos of many components. The change history page lists six changes, the latest being January 1970, the year IU-508 was launched.
Inertial guidance accelerometers, like those in intercontinental ballistic missiles, were particularly suited to the purpose of an astronaut operated traversal gravimeter due to three main attributes: a large range of sensitivity, comparatively small size and weight, and the ability to calibrate the instrument under low acceleration conditions.
The result was an estimated reliability of 99.6% over 250 hours of operation, which was far more than the few hours required for an Apollo mission. With four memory modules, giving a total capacity of 16,384 words, the computer weighed 72.5 lb (32.9 kg), was 29.5 by 12.5 by 10.5 inches (750 mm × 320 mm × 270 mm) in size and consumed 137W.
The Apollo 12 empty S-IVB, Instrument Unit, and spacecraft adapter base, had a mass of about 14 tonnes; 15 short tons (30,000 lb). [6] This is less than one-fifth of the 77.1-tonne; 85.0-short-ton (169,900 lb) mass of the Skylab space station , which was constructed from a similar S-IVB and fell out of orbit on 11 July 1979. [ 7 ]
The first five Saturn IB launches for the Apollo program were made from LC-34 and LC-37, Cape Kennedy Air Force Station. The Saturn IB was used between 1973 and 1975 for three crewed Skylab flights, and one Apollo-Soyuz Test Project flight. This final production run did not have alternating black and white S-IB stage tanks, or vertical stripes ...
Apollo astronauts frequently aligned their spacecraft inertial navigation platforms and determined their positions relative to the Earth and Moon by sighting sets of stars with optical instruments. As a practical joke, the Apollo 1 crew named three of the stars in the Apollo catalog after themselves and introduced them into NASA documentation.