Development
When procurement of Saturn Vs other than those required for the lunar landing was stopped in 1968, focus shifted to AAP. Aside from attempting to show that Apollo presented value for money, NASA and the main contractors of Boeing, Grumman, North American Aviation and Rockwell also hoped to put off the inevitable scaling down of staff and facilities following the completion of the first Moon landing.
Three AAP proposals were selected for development:
The Apollo Telescope Mission would be an Earth-orbiting mission for solar observation. The telescope would be based on a modified Lunar Module ascent stage, and launched using a S-IVB. The telescope would be docked to a CSM with a three-man crew. Solar panels on the telescope would provide additional power, allowing an extended mission of 21–28 days. The telescope module would include a pressurized compartment providing additional living and workspace for the crew.
The Apollo Manned Survey Mission proposed an Earth-observation science module also based on the LM ascent stage, and would also have been launched using a S-IVB vehicle into a high-inclination orbit. It was also proposed that a surplus Saturn V would launch a manned lunar survey mission to establish suitable sites for later manned landings.
The wet workshop space station concept provided for a low-budget Earth orbiting station. The original plan, as proposed by Wernher von Braun, used the S-II stage as the primary structure of the station, with the area normally filled by the S-IVB stage replaced with an equipment carrier. These plans were modified to use the S-IVB when Saturn V production ended with just enough boosters for the lunar missions alone.
In the meantime several of the Earth-orbit "checkout" missions for Apollo had been canceled, leaving a number of Saturn IBs unused. The plans were changed to use the S-IVB stage, used on both rockets, as the primary station structure. A modified S-IVB would be launched into orbit, the second stage carrying a docking module and large solar panels in the area normally carrying the LM. A CSM would then be able to dock with the second stage and enter the now-empty fuel tanks. It was also suggested that the Apollo Telescope and Survey Mission modules might be docked to the Wet Workshop to create a modular space station.
Read more about this topic: Apollo Applications Program
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