[Space] [Noisebridge-discuss] Reminder: Spacebridge, 5pm tonight (pants optional) EOM

Mikolaj Habryn dichro at rcpt.to
Tue Jan 12 20:26:30 UTC 2010

Thanks Ed and Adam :)

Our two planned complications will be releasing part of the payload at
relatively low altitude (glider attempting autonomous return from 1k
or 5k or so), and an Arduino controlled release valve to extend our
high-altitude duration, but I'm not particularly confident of getting
either of them ready by the first launch and they shouldn't make a
difference to the time in controlled airspace anyway (assuming we
calculate excluding the glider weight and detach it below).


On Tue, Jan 12, 2010 at 12:15 PM, Adam Fritzler <mid at zigamorph.net> wrote:
> On Tue, Jan 12, 2010 at 11:56 AM, Mikolaj Habryn <dichro at rcpt.to> wrote:
>> [+space, for more eyeballs]
>> On Mon, Jan 11, 2010 at 4:07 PM, Ozzy Satori <ozzymandi at gmail.com> wrote:
>>> Hey Mikolaj,
>>> It's Ozzy-
>>> Do you have a basic function for how quickly we can anticipate this thing to
>>> climb out?  It'd help a great deal in my contacts to the FSDO if I could
>>> have reasonable time estimations for when the balloon will cross through:
> The predictions from this site tend to be very accurate.  All the
> projects mention it.  You enter the latlong of the launch location,
> the burst altitude, and the launch time (offset from the weather model
> data time) and it gives you a complete prediction with times and
> velocities.    http://weather.uwyo.edu/polar/balloon_traj.html
> You'll see the ascent pattern from looking at the KML output in google
> earth that the balloon will spend most of its time in Class A airspace
> -- ascending rapidly into it (within 20 minutes), slowing down, and
> then around 80,000 feet ascending very rapidly to burst pressure.
> asf.

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