Monday, May 4, 2009

OK, well, Altitude is down, temperature is down, what's going on? I think we lost some helium at the high altitude, but maybe it's just a swirling air mass.

Coord 43.31595 88.10574 alt 7194.8ft hd 0.0 t 18fbat 4.058

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5 comments:

  1. FutuneralMay 4, 2009 at 8:39 PM

    Just realized that this thing is carried by simple birthday balloons. They sometimes do not last even a couple days at home..

    for the next try :)
    http://www.balloonsdirect.com/weather-balloons.htm?gclid=CLLKw-WEpJoCFQEhDQodkGE69A

    ReplyDelete
  2. Chris FMay 4, 2009 at 9:40 PM

    Ah ha! We needed Mylar to build pressure to limit the altitude. Weather balloons will expand forever and eventually freeze and burst.

    Plus, we can get mylar quick :)

    ReplyDelete
  3. AMQMay 4, 2009 at 10:01 PM

    it's cold in wisconsin, of course the altitude is down corresponding to the ambient air temp. aloft. bouyancy is all about displacement and density. did you temperature test it in a freezer?

    good luck with the overnight.

    best regards

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  4. UnknownMay 4, 2009 at 10:28 PM

    Other samples have done time in the freezer and the oven. the main concern is the battery temperature going too low.

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  5. Chris FMay 4, 2009 at 10:31 PM

    Hey Andreas.... well.... the balloon shrinks in the cold (unless it's under pressure), but the density of the air around it gets more dense too.

    The "plan" was to get to 12,000 feet and level out. I think we lost air at 16K feet.

    I wouldn't be surprised to see it "bounce" back up during the day, but for now it's stuck in a cornfield. :(

    ReplyDelete

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