highaltitude.log.20100122

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[00:13] <SpeedEvil> http://www.lidl.co.uk/cps/rde/xchg/lidl_uk/hs.xsl/index_7777.htm
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[00:29] <Laurenceb> a "teaflow" oven :P
[00:30] <Laurenceb> pity heat lamp bulbs are so expensive
[00:31] <Laurenceb> I'm off, cya
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[00:33] <SpeedEvil> Laurenceb: well - yes and no
[00:34] <SpeedEvil> http://radionics.rs-online.com/mobile/search/searchBrowseAction.html?method=retrieveTfg&binCount=1&Ne=4294957972&Ntt=1000w+linear&Ntk=I18NAll&Nr=AND%28avl%3aie%2csearchDiscon_ie%3aN%29&Ntx=mode%2bmatchallpartial&N=4294955376&Nty=1
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[02:05] <juxta> hmm
[02:05] <juxta> dont suppose anybody is still up?
[02:06] Action: juxta is testing lithium batteries in dry ice, the energizer cells are doing worse than the no brand ones so far
[02:11] <SpeedEvil> well - dry ice is a bit colder
[02:11] <SpeedEvil> energiser lithium?
[02:15] <juxta> SpeedEvil: yeah, energizer lithium
[02:15] <juxta> and some 'eclipse' lithiums
[02:16] <juxta> after about 15 minutes in the dry ice, the energizers are good for about 150mA, the eclipse are managing about 750mA
[02:16] <juxta> and an alkaline is ~2mA
[02:16] <juxta> NiMH is good for about 5mA
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[02:57] <Twiner> 2mA!
[02:57] <Twiner> Appalling.
[02:58] <SpeedEvil> at -75C or whatever dry ice is - which is colder than any part of the sane atmosphere - it'll be frozen
[02:58] <SpeedEvil> -78 says wikipedia
[02:59] <Twiner> You're not adding a heating element with the batteries and electronics?
[02:59] <Twiner> Perhaps -10C is more manageable for the poor battery cells.
[03:02] <SpeedEvil> well - -75C is ~25-30C colder than the outside temp of a typical flight
[03:02] <SpeedEvil> and it's easily 50C colder than what you'll get with fairly minimal insulation
[03:03] <Twiner> Extreme destructive tests. Me like. :)
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[03:05] <Twiner> SpeedEvil: So, -25c-ish is the ballpark figure to go after when testing high altitude equipment?
[03:08] <N900evil> well it's not an unrealistic figure
[03:08] <N900evil> insulated and dissipating a bit of power
[03:09] <N900evil> work out the insulative value of a small thickwall box
[03:15] <Twiner> I read an interesting comment on HaD.com about a high altitude project. Well, the poster began rambling about lying to the gov't, funding et cetra, but the basic idea was interesting.
[03:17] <Twiner> He proposed a mini high-altitude UAV which were to be launched high up by high altitude ballons. Once it was up there, it would be released, and stay there by means of solar power.
[03:19] <Twiner> It could be remotely controlled from the ground, and perhaps even carry sensors to monitor gas levels, ratiation, etc.
[03:19] <Twiner> A poor mans satellite of sorts.
[03:19] <Twiner> Anybody have thoughts about this idea?
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[03:47] <SpeedEvil> largely pointless
[03:47] <SpeedEvil> If it can sustain its level at high altitude
[03:47] <SpeedEvil> then it can climb at low
[03:48] <SpeedEvil> The hard part is the batteries
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[03:48] <SpeedEvil> it's got to have battery power to last >8 hours
[03:48] <SpeedEvil> and it's got to have solar cells big enough to recharge them while flying
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[11:24] <Laurenceb> http://hackaday.com/2010/01/21/live-high-altitude-balloon-launch
[11:26] <Laurenceb> lol at comment by "Drone"
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[13:21] Action: Laurenceb got accel/magno ellipse fitting working
[13:22] <Laurenceb> this sparkfun 6DOF data is interesting - it seems to converge on a solutuion to within 1mg or so
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[13:23] <SpeedEvil> I forget - you bought one?
[13:23] <juxta_> hi all
[13:23] <Laurenceb> but the standard deviation of the accel data is about 10mg - as it was handheld
[13:23] <SpeedEvil> Or are you working off ohters date
[13:23] <SpeedEvil> hi j
[13:23] <Laurenceb> no, from the sparkfun forum
[13:23] <SpeedEvil> aj
[13:23] <Laurenceb> hi juxta, are you on hackaday?
[13:24] <juxta_> yeah I am Laurenceb
[13:24] <Laurenceb> neat, good luck with the project
[13:24] <juxta_> cheers
[13:25] <juxta_> someone just pointed out the stupidity of our CASA regulations in the comments
[13:25] <juxta_> ie that payload weight can be upti 4kg, but balloon diam cannot exceed 2m at any time during flight
[13:27] <Laurenceb> bb this evening, cya all
[13:32] <SpeedEvil> Does it say anywhere it has to be spherical?
[13:33] <SpeedEvil> For example - a 2m dia*10m cylinder
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[14:26] <juxta_> hey SpeedEvil
[14:26] <juxta_> it doesnt explicitley mention that
[14:26] <juxta_> but they handle approval on a case by case basis
[14:27] <juxta_> unsure why the documentation is even there - they're making me carry all this stuff which the regs dont mention
[14:27] <juxta_> ie audible warning, radar reflector etc
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