Helium loss


Hey everybody,
We're interested in some extended flights (several days) using simple
latex (chloroprene?)  balloons such as the ones from Kaymont.  We have
a ballast/gas release system that we're designing...  One piece of
information we haven't been able to find is how much helium we can
expect to lose over time.  Does anyone have some metrics or know where
to grab them?


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