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Aerospace Small Pressurized Container up to 100,000ft

  1. Jul 22, 2011 #1
    Hello, looking for any info out there on building a small pressurized container for weather balloon experiment. Only needs to withstand heights up to 100,000 ft. Anyone have any experience or advice?

    Thanks
     
  2. jcsd
  3. Jul 22, 2011 #2

    DaveC426913

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    That's awfully broad. Pretty sure I could find a container that can hold 1 atmo of pressure with both hands closed and one eye tied behind my back.

    By some accounts, a 2L pop bottle will hold several atmos.
     
  4. Jul 22, 2011 #3
    Thanks Dave, we're learning...

    So 1 atmosphere not too big a deal?

    Tell me what you would use if you we`re going to send some cameras up there to play and record audio.
     
  5. Jul 22, 2011 #4

    DaveC426913

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    Why would you need to pressurize it?

    Why would you need to play audio at 100,000ft?
     
  6. Jul 22, 2011 #5
    Science experiment, to hear what it sounds like. Sounds like not enough vacuum at 100k ft to make it not audible?

    At what height would absence of sound waves make it inaudible?
     
  7. Jul 23, 2011 #6

    DaveC426913

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    Ah. I wondered if that's where you were going with it.

    Then you definitely don't want it in a pressurized container, do you! That would utterly defeat your experiment.
     
  8. Jul 23, 2011 #7
    Doh, of course. Thanks. So you think audio will be...audible?
     
  9. Jul 23, 2011 #8

    DaveC426913

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    Hard to say, but my money would be on yes.

    A quick Google will show you the pressure at 100,000ft as a fraction of pressure at sea level.

    It's low, but seems to me it would be enough, though your sound will be very thin.
     
  10. Jul 23, 2011 #9
    OK, lets give it a try. I'll post results here.

    Thanks for your help.
     
  11. Jul 23, 2011 #10

    DaveC426913

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    Don't forget your baseline test here at sea level, so you have something to compare it to...
     
  12. Jul 31, 2011 #11
    This guy that jumped from the balloon at 100000ft said that he couldn't hear anything...and he was going something close to 700mph.
     
  13. Aug 1, 2011 #12

    DaveC426913

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    Interesting, but not exactly a controlled test.
     
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