highaltitude.log.20060222

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[13:36] <jcoxon> hi borism
[13:37] <borism> hello
[13:37] <jcoxon> welcome to #highaltitude
[13:40] <jcoxon> brb
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[14:16] <Neutrino> HI
[14:27] <jcoxon> hi
[14:27] <jcoxon> sorry will brb
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[15:11] <Neutrino> hi james
[15:11] <jcoxon> hey
[15:11] <Neutrino> hows it going
[15:11] <jcoxon> sorry about that - having a fight with my ibook to install the latest kernel
[15:12] <Neutrino> who won?
[15:12] <jcoxon> it did
[15:12] <jcoxon> can't get udev to work
[15:12] <Neutrino> ha
[15:12] <jcoxon> guess i'll have to go back to ubuntu this evening :(
[15:13] <Neutrino> ubuntu??
[15:14] <Neutrino> I got the GM circuit working
[15:15] <jcoxon> ubuntu is a linux distribution
[15:15] <jcoxon> oo cool
[15:15] <jcoxon> how does the GM bit work then?
[15:16] <Neutrino> yeah just looked it up, my linux knowledge is pretty grim..
[15:16] <Neutrino> the gm circuit gives a 3.3v high pulse everytime there is a count
[15:17] <jcoxon> perfect
[15:17] <Neutrino> The tube I was originally thinking of using is a pancake detector which has a large mylar window over it
[15:17] <jcoxon> right
[15:17] <Neutrino> I realised halfway through that 100,000 ft it will pop!
[15:17] <jcoxon> very good point
[15:17] <Neutrino> so went for a sealed thin walled aluminum GM tube
[15:18] <jcoxon> okay
[15:18] <Neutrino> I will try and email a picture, should be able to post today or tommorow
[15:19] <jcoxon> excellent
[15:19] <jcoxon> still haven't got permission yet
[15:19] <jcoxon> will email the CAA and see how its coming along
[15:19] <Neutrino> measures 100mm x 180mm
[15:19] <Neutrino> 50mm high max
[15:19] <jcoxon> i haven't actually put together the payload yet
[15:19] <jcoxon> so we are still flexible for size/position
[15:20] <Neutrino> just as well, last minute changes can mess everything up!
[15:20] <jcoxon> not happy with the polystyrene i've got alread
[15:20] <Neutrino> why
[15:22] <jcoxon> don't think the box is thick enough
[15:22] <jcoxon> both for insulation and also landing
[15:22] <jcoxon> its a little to makeshift for my liking
[15:23] <Neutrino> yeah, you need a bit of strength
[15:24] <jcoxon> going to be a bit of a push - have a crazy week next week
[15:24] <Neutrino> wev'e got flat polystyrene sheets here, but they are only 15mm thick..
[15:24] <jcoxon> really want hte payload box i used for pegasus I
[15:24] <jcoxon> was really thick, small and fitted together well
[15:25] <Neutrino> yeah like they use in fish markets etc
[15:27] <Neutrino> what about cardboard? then use fleece/bubblewrap for insulation
[15:28] <Neutrino> bit unporven I spose...
[15:28] <Neutrino> sp. unproven
[15:29] <Neutrino> what size of box do you need?
[16:13] <jcoxon> sorry got distracted :-D
[16:13] <jcoxon> bad feeling bubble wrap might go a bit funny at low pressure
[16:13] <Neutrino> oh yeah! doh
[16:13] <Neutrino> great mission designer I turned out to be :) lol
[16:14] <jcoxon> just got an email from the CAA saying that they are processing my application and will issue asap
[16:14] <Neutrino> must be a relief!
[16:14] <jcoxon> much happier when the mission is over :D hehe
[16:16] <Neutrino> yeah
[16:17] <Neutrino> I've got all the stess to come!
[16:18] <Neutrino> my problem is I live near the sea so 50/50 whatever I launch will end up in the drink
[16:18] <Neutrino> so I am going to have to make it low cost and disposable methinks
[16:19] <jcoxon> yeah
[16:19] <jcoxon> i live relatively near the sea
[16:19] <jcoxon> though in the UK you are never more then 70miles from the sea
[16:19] <Neutrino> true, but I can hear the waves!
[16:20] <jcoxon> okay you win
[16:20] <Neutrino> :)
[16:21] <Neutrino> whats the max lift weight of peg II?
[16:21] <jcoxon> not sure
[16:21] <jcoxon> a lot
[16:22] <jcoxon> its going to way about 2kg
[16:22] <Neutrino> blimey, thats a lot of lift
[16:22] <jcoxon> no no
[16:22] <jcoxon> sorry weigh no way
[16:22] <jcoxon> oops
[16:22] <jcoxon> oh its a 1200g balloon
[16:22] <jcoxon> is massibe
[16:22] <jcoxon> massive*
[16:23] <Neutrino> should be fine
[16:23] <Neutrino> does launching on a day when there is high pressure mean you go higher than a day when there is low pressure?
[16:24] <jcoxon> not sure
[16:24] <Neutrino> presumably it will still meet a near vaccuume and stop at the same height?
[16:24] <jcoxon> i just prefer high pressure as it means that the winds are low
[16:24] <Neutrino> I notice if you look at the met office soundings the baloons sometimes don't go above 16,000
[16:25] <Neutrino> other times they go much higher, wondered if it was the pressure that made the difference or just less He
[16:25] <jcoxon> probably He
[16:25] <jcoxon> though the limiting factor is the balloon size
[16:26] <Neutrino> probably overfill rather than underfill and it pops too soon
[16:27] <Neutrino> back in 1
[16:30] <Neutrino> got to shoot off, now got a piano lesson
[16:30] <jcoxon> no problem
[16:30] <jcoxon> speak to you soon
[16:31] <jcoxon> oh and if you are still able to - the GM tube would be great :-D
[16:31] <jcoxon> thanks
[16:31] <Neutrino> gm tube should be ok to send tommorow depends on time
[16:31] <Neutrino> l8tr
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[21:35] <jcoxon> hey all
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[00:00] --- Thu Feb 23 2006