highaltitude.log.20070116

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[02:33] <icez> hi defy
[02:40] <defy> hey :()
[02:40] <defy> :)
[02:40] <icez> :D
[02:42] <defy> any recent launches?
[02:44] <icez> mmm no
[02:44] <icez> james and a few others are trying
[02:44] <icez> but the weather sucks
[02:44] <icez> :)
[02:44] <icez> a lot of new balloons coming soon though
[02:45] <defy> cool
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[08:24] <defy> hey jcoxon
[08:24] <defy> hows it
[08:30] <jcoxon> not bad thanks
[08:30] <jcoxon> my gumstix is annoying me though - stupid audio seems broken and i can't find out why
[08:31] <jcoxon> how about you?
[08:47] <defy> ah that sucks...audio is one thing i haven't tackled on mine yet
[08:47] <defy> not too bad..
[08:50] <jcoxon> cool
[08:51] <jcoxon> work at uni has just kicked in which doesn't help :_D
[08:52] <defy> hehe
[09:07] <jcoxon> :( i want to try out the new kde on mac but it only has torrent downloads
[09:07] <jcoxon> which are blocked
[09:22] <defy> do you run linux on your mac?
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[10:56] <jcoxon> i dual boot tiger and ubuntu
[10:56] <jcoxon> but cause QT has been released for mac they are porting kde to run with mac
[10:56] <jcoxon> pretty cool
[11:24] <defy> sweet
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[21:48] <Laurenceb> helium valve is finished :-)
[21:49] <Laurenceb> I've got a servo fixed on to turn it
[21:53] <Laurenceb> only slight problem is writing some code to correctly vent the helium so the balloon hovers at max altitude
[21:55] <Laurenceb> it could be ready in time to fly with MiHAB3, but it really needs a custom made long duration payload
[22:07] <Laurenceb> has anyone got any knowledge of fluid dynamics to help me out??
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[22:34] <Professor> g'day all
[22:34] <Professor> I think I solved my camera issue
[22:35] <Professor> http://www.electronics123.com/s.nl/it.A/id.2027/.f?sc=8&category=241
[22:35] <Professor> I'm just going to use one of those with a gumstix and store image data on a CF card
[22:35] <Professor> I ordered one with a wide angle lens + carrier board last night. Hopefully I'll see it soon
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[22:39] <Professor> hello
[22:39] <laurenceb_> hi there
[22:39] <Professor> anything interesting going on ?
[22:40] <laurenceb_> know anything about fluid mechanics?
[22:40] <Professor> some
[22:40] <Professor> what's up?
[22:40] <Professor> I used to write CFD codes
[22:41] <laurenceb_> I'm trying to work out how much gas will flow through a valve
[22:42] <laurenceb_> as a function of pressure
[22:42] <laurenceb_> its for a helium dump valve I've just made
[22:43] <Professor> ah, that depends on a lot of things
[22:43] <Professor> it's probably best to just make a lookup table
[22:44] <Professor> the geometry of your valve will change when you adjust it and that will change everything
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[22:56] <lb> i'm laurenceb sory bad wii
[22:57] <lb> -wifi lol
[22:57] <lb> got chased by a guy wwith a yagi ant
[22:57] <lb> who came out of his house
[22:58] <lb> now its raining
[22:59] Action: Professor is away - Idle as a mothafucka - messages will be saved.
[22:59] <lb> anyway proffessor, how will rate of helium loss scale with pressure?
[22:59] <lb> okay I see
[23:00] <lb> cant stay 4 log my laptop will fry in te rain
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[23:02] <lb> that was a bit mad, he had a yagi and signal meter and was after me
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[23:13] <laurenceb> http://bpesoft.com/s/wleizero/xhac/?M=v
[23:14] <laurenceb> this is bad as it means the rate of helium loss thro valve will be independant of pressure
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[23:14] <laurenceb> hi there
[23:14] <laurenceb> launch still on?
[23:15] <jcoxon> hmmmm steve is still deciding
[23:15] <laurenceb> I have slightly less work than I thought yesterday:)
[23:15] <jcoxon> i don't think it'll happen
[23:15] <jcoxon> the weather isn't great
[23:15] <jcoxon> if anything it'll be sunday
[23:16] <laurenceb> hmm doesn't matter if we can do it the next weeken
[23:16] <jcoxon> yeah
[23:16] <laurenceb> just got chased by a guy with a yagi
[23:16] <laurenceb> im using open wifi
[23:17] <laurenceb> he came out o his house when i connected
[23:18] <jcoxon> naughty laurenceb
[23:18] <jcoxon> his must be monitoring his router to see you connect
[23:18] <laurenceb> I've got a working helium valve
[23:19] <laurenceb> got a servo and polypipe valve
[23:19] <laurenceb> its a bit heavy, think I can use some different pipe for part of it tho
[23:20] <jcoxon> interesting
[23:20] <laurenceb> at moment about 300grams weight
[23:20] <laurenceb> Think I can get it down to 250 or less
[23:21] <jcoxon> right
[23:21] <laurenceb> problem is that viscousity is inependant of pressure
[23:21] <jcoxon> i'm battling with getting audio on my gumstix - nothing to do with ballooning
[23:21] <jcoxon> and i've got a whole day tomorrow in the "basement" diagonosing 3000yr old skeletons
[23:21] <jcoxon> :-D
[23:22] <laurenceb> but pressure drops with alt and excess pressure in envelope is prop to pressure of atmosphere
[23:22] <laurenceb> so to put it simply, th
[23:22] <laurenceb> amout of helium we can vent scales with pressure^2
[23:23] <laurenceb> very bad for high alt operation, we open valve and nothing happens:(
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[23:24] <laurenceb> at 30km, we'll only vent 10^-4 times as much helium rate wise
[23:27] <laurenceb> I need to do some experiments to see how fast my valve will deflate a balloon at ground level, then I can extropolate and say if its possible at altitude x
[23:28] <jcoxon> right
[23:28] <laurenceb> its only a 15mm valve, I could try upgradiong to a 22mm
[23:30] <laurenceb> met this crazy guy at a model plane shop today, he's making a reconnicence helicopter for the KGB
[23:30] <laurenceb> ther're paying him £15K
[23:31] <laurenceb> it has a virtual reality style helmet that links up to a zoom camera via encripted video link, when you tilt your head or turn round, so does the camera, so it's as it you're onboard
[23:33] <jcoxon> hehe - thougth the kgb didint' exist anymore
[23:33] <laurenceb> they asced him to send it to the rusian embassy, and have filled in a VAT form as its for "Russian Goverment use"
[23:33] <laurenceb> okay "FSB" or whatever it is
[23:35] <laurenceb> he's also got a remote controller fox that shouts random insults at people
[23:35] <laurenceb> -controlled
[23:36] <jcoxon> haha
[23:36] <jcoxon> he's mad
[23:36] <laurenceb> workes doing special effects mostly
[23:37] <laurenceb> apparently epoxy resin is carcinogenic
[23:37] <laurenceb> jcoxon would you know about this?
[23:38] <jcoxon> never heard of epoxy resin being carcinogenic
[23:38] <jcoxon> but wouldn't suprise me
[23:38] <jcoxon> the solvents they use are nasty
[23:38] <laurenceb> its the rapid hardener that is highly toxic
[23:38] <laurenceb> also balsa wood
[23:38] <laurenceb> which seems a bit mad
[23:39] <jcoxon> hehe - everything is carcinogenic :-)
[23:39] <laurenceb> the fibres are similar to asbestos
[23:39] <jcoxon> in balsa wood it would be the wood dust
[23:40] <laurenceb> death by aircraft modelling
[23:40] <jcoxon> get in to your lungs and cause all sorts of trouble
[23:41] <laurenceb> arg I just trod in some sh*t
[23:41] <laurenceb> I'm walking along a street wi-fi hopping
[23:41] <jcoxon> bad laurenceb
[23:41] <laurenceb> It's fun
[23:42] <laurenceb> there is wifi everywhere in oxford
[23:42] <laurenceb> need a mobile with it that would be useful
[23:42] <jcoxon> find some legal wifi to steal
[23:42] <jcoxon> http://nodedb.consume.net/nodedb.php
[23:43] <laurenceb> cool
[23:44] <laurenceb> okay I'm off back to college I should do some work
[23:44] <laurenceb> cya
[23:45] <jcoxon> cya
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[00:00] --- Wed Jan 17 2007