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As the picoballooners have found - gas loss through diffusion on
the ground is completely different in floating flight. A foil
balloon might loose 1g of lift (out of the 10g or so it was filled
with) over 24 hours on the ground under no pressure - yet stay up
for months in the air - under 0.2 psi differential pressure.
On 22/09/2022 22:49, BASE_DePauw wrote:
did not take the time to do repeated trials, earlier this
summer we filled a 200 gram Cloudbuster with helium indoors
and set it for an initial 200 grams of positive lift. 24
hours later the lift was only 100 grams. After an additional
24 hours the lift was 50 grams. One more day and there was no
lift at all.
We did not
treat the balloon with the HiFloat solution.
On Thu, Sep 22, 2022 at 5:21
PM Steve G8KHW / AJ4XE <steve@...
On 22/09/2022 21:53, Joe WB9SBD wrote:
If I remember correctly Hi Float is
just HE and air , nothing special. so the HE will
still escape just as fast and left with an envelope
filled with air.
Hi Steve, thanks for the
information! That's an interesting suggestion about
Hifloat -- it looks like it could make a significant
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
2 E. Hanna Street
Greencastle, IN 46135