From: nospam@127.0.0.1   
      
   On 2020-06-29 4:34 PM, JF Mezei wrote:   
   > On 2020-06-28 17:03, Niklas Holsti wrote:   
   >   
   >> Who says "no venting"?   
   >   
   > I would have thought that you'd want to conserve all your fuel and LOX   
   > for such a long trip, otherwise you need to bring along a lot more. Then   
   > again, it comes down to mass of exttra fuel you'll be venting vs mass of   
   > extra strength in tank to contain it.   
   >   
   > Just realised that for O2, venting it might simply release it to the   
   > ECLSS system for the occupants.   
   >   
   > So that leaves methane that is continiously lost.   
   >   
   >   
   >> In the SpaceX videos of Mars trips (quite old already...) the Starship   
   >> points its rear end (rocket end) at the Sun,   
   >   
   > In the case of the shuttle, were the H2 and O2 tanks used for the fuel   
   > cells and ECLSS contain has or liquid ?  Was the "natural" venting from   
   > boiling at a rate that pretty much matched the need for these gases for   
   > both fuel cells and ECLSS?   
   >   
   > In the case of the Apollo service module, was it aslo self contained   
   > without need to "contain" high pressures because it assumed O2 and H2   
   > would remain below -183°?  Surely they weren't always sheltered from the   
   > sun? (and being covered by the outer skin of ship, would have internal   
   > heat of craft reflect onto tanks).   
   >   
      
   I vaguely remember that for Apollo at least the O2 was kept in some kind   
   of solid/liquid slurry. Kinda of like an Oxygen slushy. And hence the   
   need to do "cryostirs" that led to the explosive disaster on Apollo 13   
   when a routine cryostir triggered an explosion due to the mishandling of   
   the Service Module tanks during assembly at the Cape weeks before. My   
   memory may be faulty on this, a quick Google search would make it clear.   
   Sometimes, it's just quicker to put a faulty memory out here and give   
   others the pleasure of making a correction, and then there are those   
   that correct the correctors, etc. See, making it fun for everyone! :-)   
      
      
   > Were there other crafts that were built with cryo propellants uses that   
   > were contained for more than a few hours?   
   >   
      
   If you post these questions to Henry Spencer on the ARocket mailing   
   list, I have no doubt you will get the correct answers from [his] memory...   
      
   > http://www.arocketry.net/   
      
   I would have to look it up. You can too.   
      
   Dave   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)