Author
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Topic: Abating the cold temperatures on Apollo 13
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Careos Member Posts: 13 From: Dayton, OH, USA Registered: Mar 2011
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posted 06-01-2017 07:32 AM
A few weeks ago, a friend and I were discussing various things regarding Apollo 13. One of our shared questions was when it was so cold in the lunar module and command module, why did they not don their pressure suits? Even just having them on should have afforded some level of insulation against the cold. Seems odd they would have just sat there in their coveralls and shivered. |
Robert Pearlman Editor Posts: 43576 From: Houston, TX Registered: Nov 1999
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posted 06-01-2017 08:15 AM
NASA flight controller Robert Frost replied to a similar question on Quora on 2013: 1) There wouldn't be room in the module for the three of them, suited up and connected to the PLSS (Portable Life Support System) to move around and do their work. 2) The suits require a power supply for the circulation system. They didn't have the power to spare. Without that circulation system they would have quickly overheated. 3) They did use parts of the suit circulation system to circulate air in the cabin while the cabin fans were turned off, to save power. 4) They also needed to use the PLSS to produce water. |
Careos Member Posts: 13 From: Dayton, OH, USA Registered: Mar 2011
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posted 06-01-2017 01:07 PM
Interesting, you would have thought wearing them without the PLSS (even just part of them) would have kept them warm and not required any external resources. I was just thinking of like a space snuggie as opposed to a functioning suit. |
MCroft04 Member Posts: 1647 From: Smithfield, Me, USA Registered: Mar 2005
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posted 06-01-2017 08:42 PM
I sat at a table for lunch with Fred Haise once and someone asked him the same question. Fred stated that he and Jim did don their lunar over boots to help keep warm. I asked him if he shared his boots with Jack S. With a wry smile, one of the nicest and kindest astronauts I have ever met responded, "no." |
Jim_Voce Member Posts: 273 From: Registered: Jul 2016
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posted 12-30-2017 12:19 PM
It has been noted how cold the temperatures were aboard the CSM and the LM on Apollo 13. I have two questions here:The LM was working perfectly during the mission and therefore, should have been able to have maintained a comfortable temperature for the astronauts. But perhaps the temperatures in the LM were compromised by cool air coming over from the CSM and the LM did not have sufficient output to compensate for that. Is that correct? Secondly, the astronauts had their pressure suits available but did not wear them for the duration of the flight. I would have assumed that the pressure suits would have given them a heavy layer of warmth. It is true that the LM would not have been able to hold three men in pressure suits, but Haise spent most of his time inside of the CSM convalescing with an infection. So all three men could have worn their pressure suits. Any idea why they did not wear them? Editor's note: Threads merged. |
Jim Behling Member Posts: 1488 From: Cape Canaveral, FL Registered: Mar 2010
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posted 12-30-2017 02:27 PM
quote: Originally posted by Jim_Voce: The LM was working perfectly during the mission...
No, it wasn't working "perfectly." The LM was operating at low power levels and wasn't producing enough heat. Also, the vehicle attitude was not conducive to heating. The CSM had nothing to do with it. quote: Any idea why they did not wear them?
See above. Also, Haise was not in the CM. Too cold and no working ECS (No O2 added, no CO2 removed, no H2O removed and air movement). |
Spacepsycho Member Posts: 819 From: Huntington Beach, Calif. Registered: Aug 2004
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posted 02-01-2018 02:07 PM
I've also heard that the PLSS was being saved in case the crew needed them for re-entry. I've also wondered why the A7L suits weren't used without the PLSS to keep the guys warm. I get how the pressure suit would get hot and wet inside, but couldn't they have left them unzipped? |
Jim Behling Member Posts: 1488 From: Cape Canaveral, FL Registered: Mar 2010
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posted 02-01-2018 02:29 PM
The second post has the reason, they would have overheated. Unzipped would still be inadequate. |