highaltitude.log.20080608

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[00:17] <Laurenceb> hi folsk
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[10:10] <mc-> hi edmoore, just been testing my superlight payload (indoors). It switches the GPS on/off to save power. Uses 15mA on average.
[10:11] <edmoore> oh awesome!
[10:11] <mc-> including GPS, and transmitter
[10:11] <edmoore> that's a really really neat idea - a sort of minimal spec thing
[10:11] <mc-> will finish the polystrene today, and it's ready to fly
[10:11] <edmoore> I wonder..... could everything be put in a camera film pot or box of matches or something?
[10:12] <mc-> easily, but not on this version, I'm using a larger GPS module
[10:12] <mc-> 25x25mm GPS module
[10:13] <mc-> for testing, can a balloon be overfilled, so it pops early?
[10:13] <mc-> is there a way of calculating the overfill?
[10:14] <mc-> it should need a chute, it uses the polystyrene as the chute
[10:14] <mc-> *should not
[10:14] <edmoore> oh for sure
[10:14] <edmoore> you could use a 300g balloon and get probably 25km
[10:14] <edmoore> or lower as required by overfill
[10:15] <edmoore> assuming it only weighs ~100gish
[10:15] <edmoore> it sounds like a great device to add as a completely self-contained backup for other payloads too
[10:15] <mc-> could the overfill be calculated, as a total lift required? so it's easy to gauge how far to fill the balloon?
[10:16] <mc-> How about massively overfilling? so it only goes up 10km, then it's easy to recover?
[10:16] <edmoore> yeah pretty much
[10:17] <edmoore> no problem
[10:17] <edmoore> and it would shoot up like a rocket
[10:17] <edmoore> so little drift
[10:17] <mc-> sounds good
[10:18] <mc-> just about finished the radio controlled cutdown as well...
[10:18] <edmoore> Iain is going to try for his L2 today
[10:18] <mc-> it works by listening for a signal, if the signal disappears then it cuts down
[10:19] <mc-> good luck to Iain, I've been removed from the email lists btw, so I don't hear any news now
[10:20] <mc-> I thought EARS was last weekend?
[10:20] <edmoore> yeah that was a fairly concious decision to make the admin list only the admins, i.e. students day to day, as it was getting unweildy and large and people were having to watch what they say about sponsors and stuff
[10:20] <edmoore> it was, but it was too cloudy
[10:20] <edmoore> so we're going to CROCK in kent
[10:20] <edmoore> road trip!
[10:21] <mc-> very keen
[10:21] <mc-> np on the list, please send me an update from time to time
[10:22] <mc-> John B is going to build the I90 soon
[10:22] <edmoore> no no that's a good point, one forgets who actually gets left out when we create just a new admin list. All that happens on the new one is that we shout at each other more freely
[10:22] <mc-> and test my GPS tracker in that
[10:23] <edmoore> but will certainly keep you filled in.... there could well be a better solution to this
[10:23] <edmoore> will have a think
[10:23] <edmoore> but yeah, I need to head out as we're hitting the roat at 11
[10:23] <mc-> have fun
[10:23] <edmoore> will try to!
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[10:29] <jcoxon> wow only 5 people
[10:30] <jcoxon> now 4 :-)
[10:30] <jcoxon> bbl
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[13:50] <Hiena> Good afternoon!
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[00:00] --- Mon Jun 9 2008