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[13:50] <jcoxon> hey all
[13:50] <jcoxon> anyone around?
[13:55] <Weiss> yep
[13:58] <jcoxon> hey Weiss
[14:02] <Weiss> afternoon
[14:02] <jcoxon> indeed
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[14:04] <jcoxon> hey icez
[14:04] <jcoxon> Weiss, are you interested in getting involved with CU spaceflight?
[14:05] <jcoxon> or have you already made contact?
[14:05] <icez> hey
[14:06] <jcoxon> icez, its been so quite on here i'd thought i'd see how people were!
[14:06] <icez> :]
[14:07] <icez> i was looking at cam.ac.uk a while ago, and i found out your schools use so much different "terms" than ours
[14:07] <icez> :P
[14:08] <jcoxon> hehe
[14:08] <jcoxon> Cambridge is especially funny
[14:09] <icez> looks nice though
[14:09] <Weiss> jcoxon: in principle, yes... however i'm insanely busy with other stuff (work, MCR committee, teaching)... so i'm kind of lurking..
[14:12] <jcoxon> oh cool
[14:12] <jcoxon> I'm only helping out - trying to get as good a class in my final year as possible
[14:12] <jcoxon> (though without going insane in the process :-D )
[14:13] <Weiss> hehe
[14:13] Action: Weiss managed a first in his final year, but a certain amount of insanity was necessary
[14:13] <icez> :)
[14:13] <jcoxon> only about 2 people a year get a 1st on hte course i'm doing
[14:13] <Weiss> i'd crammed so much stuff into my head that i could barely open my eyes without setting off a load of "connections"
[14:13] <jcoxon> i'll be happy with a 2.1
[14:14] <Weiss> what course?
[14:14] <jcoxon> i'm doing Part II Biological Anthropology
[14:14] <jcoxon> (though i am a medic)
[14:14] <Weiss> your "year off"?
[14:16] <jcoxon> yup
[14:16] Action: Weiss is doing a PhD in electron crystallography
[14:17] <icez> wow
[14:19] <jcoxon> did people see the results for the Wirefly X Prize Cup?
[14:20] <jcoxon> nice to see some of those projects actually beginning to work
[14:20] <icez> and others not so well
[14:21] <jcoxon> at least its moving forward :-D
[14:22] <icez> yeah
[14:23] <icez> still have a while to go before we can take the elevator to the moon ;)
[14:24] <Weiss> hehe
[14:24] <Weiss> that's kind of one of the things that's being worked on in my department
[14:25] <jcoxon> its an interesting idea
[14:26] <jcoxon> but getting it to work to the required altitude is a different matter!
[14:26] <icez> especially since the moon isn't stationary
[14:29] <jcoxon> one the next nova launch at the beginning of november i'm meant to be helping to do a battery experiement so see which battery type is best
[14:29] <jcoxon> and ideas of methods of testing battery performance?
[14:30] <icez> calculating pi and seeing which one calculates it further?:P
[14:31] <jcoxon> hehe
[14:35] <jcoxon> was planning to run the tests in parallel
[14:35] <jcoxon> so sort of need something like a pic to measure the voltage from the different batteries and log it
[14:36] <jcoxon> its a litte bit of an overkill for a gumstix
[14:36] <Weiss> remember that the voltage you get will depend on the current you draw
[14:38] <jcoxon> so really i need to find out how much say the tracker circuity draws
[14:39] <jcoxon> and then simulate it for each battery pack to test their preformance
[14:39] <jcoxon> comparining the voltages to work out which is better at low temps
[14:40] <Weiss> or you could do some kind of periodic current sweep
[14:40] <Weiss> and get a whole load of I/V curves out
[14:41] <Weiss> is there anything that can't be done just by putting different batteries in the freezer though?
[14:42] <jcoxon> i think the plan though was to show that actually the batteries go through extremes
[14:42] <jcoxon> so from ground temp down to v. low temps as low as -40 then back up again (and perhaps higher if the payload sits for long periods of time
[14:43] <jcoxon> the experiment has a place on the next launch so logistically its not a problem
[14:44] <Weiss> has a thermometer been flown yet?
[14:44] <jcoxon> not on nova
[14:44] <jcoxon> but on MiHAB2
[14:45] <jcoxon> http://wiki.ukhas.org.uk/projects:mihab:mihab_2
[14:45] <jcoxon> according to laurence it got down to about -45C
[14:46] <icez> brr
[14:48] <Weiss> hmm
[14:49] <Weiss> was that just a minimum/maximum thermometer, or a full temperature log?
[14:49] <Weiss> the cooling and heating rates would be interesting
[14:49] <jcoxon> it was a 1 wire temp sensor so i guess there is a full log
[14:49] <jcoxon> one sec
[14:49] <jcoxon> i'll find it
[14:51] <jcoxon> http://wiki.ukhas.org.uk/projects:mihab:txtlog.txt
[14:52] <jcoxon> though i'm not sure i can actually translate his log file
[14:52] <jcoxon> i think temp is the last 2 sets of actually figures (not hte 0,0)
[14:53] <jcoxon> "Text log has lat, long , alt and also two bytes from ds1820 sensor, e.g 50,0 =25 degrees c & 20,0 = 10 degrees also 250,255 is -3 and 240,255 is - 8 ect. 0 on end shows that string was recovered error free."
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[17:08] <jcoxon> hey Tiger^
[17:43] <phatmonkey> hey jcoxon
[17:44] <Tiger^> hey jcoxon, hey phatmonkey
[17:52] <jcoxon> hey
[17:52] <jcoxon> can't stay for long but thought i'd see how everything is going
[17:54] <jcoxon> bbl
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[21:10] <jcoxon> hey riksta
[21:18] <icez> jcoxon, would you happen to know any 'function graphing' utility that works on linux?
[21:21] <icez> oh nevermind
[21:21] <icez> i can't believe i never thought of gnuplot.
[21:47] <jcoxon> i think i used gnumeric
[21:47] <jcoxon> once upon a time
[21:55] <Weiss_> or openoffice
[21:56] <icez> didn't know they could graph functions
[21:58] <Weiss_> can gnumeric?
[21:58] <Weiss_> gnuplot is definitely the right tool for that, anyway
[22:05] Nick change: Weiss_ -> Weiss
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[22:18] <icez> howdy rocketboy
[22:21] <jcoxon> hey r
[22:21] <jcoxon> rocketboy
[22:21] <jcoxon> (stupid typing)
[22:26] <phatmonkey> jcoxon, how's everything going
[22:27] <jcoxon> phatmonkey, its going well thanks
[22:27] <jcoxon> lots of work
[22:27] <phatmonkey> same
[22:27] <jcoxon> well sort of lots of work - more like lots of potential work
[22:28] <jcoxon> pegasus has gone into hibination
[22:28] <jcoxon> so i'm helping out with nova
[22:28] <phatmonkey> yeah
[22:29] <jcoxon> any movement with slug?
[22:29] <phatmonkey> nah not really
[22:29] <phatmonkey> l9oads of school work
[22:30] <jcoxon> know the feeling
[22:30] <jcoxon> that said i'm meant to be helping to design a battery experiment to go on nova 2
[22:30] <jcoxon> and you know me and electronics :-p
[22:31] <phatmonkey> hehe
[22:50] <riksta> hi jcoxon
[22:50] <jcoxon> hey riksta
[22:51] <riksta> sup
[22:51] <jcoxon> not much :)
[22:51] <riksta> i know that feelin
[22:53] <jcoxon> what you up to these days?
[22:54] <riksta> well uni takes most of my time (final year)...still trying to think about what to use my gumstix for....plus ive been working on my VOIP open source app thingy
[22:54] <jcoxon> oh right
[22:54] <jcoxon> cool
[22:54] <riksta> when is the next flight
[22:54] <jcoxon> hmmm well pegasus won't be for a while
[22:55] <jcoxon> haven't actually got any plans
[22:55] <jcoxon> but i'm helping with CU spaceflight - Nova 2 launches next weekend
[22:55] <jcoxon> actually its hte weekend after
[22:55] <riksta> its going actually into space?
[22:56] <jcoxon> not yet :-D
[22:56] <jcoxon> but they are working towards a rockoon which would in theory have suborbital capabilities
[22:57] <riksta> if i was closer id come to a launch
[22:57] <jcoxon> well the site is http://www.srcf.ucam.org/~cuspaceflight/
[22:58] <jcoxon> at the mo the launches are pretty simple
[22:58] <jcoxon> however it should get exciting when we start launching "meteor" and "martlet"
[22:58] <riksta> why is it a grand to launch martlet...what costs the most?
[23:01] <jcoxon> not sure
[23:01] <jcoxon> perhaps thats to cover the costs of actually getting to a point where it'll work
[23:01] <riksta> it says per launch, so i guess the rocket
[23:01] <riksta> but i thought they were cheap
[23:03] <jcoxon> to a point i guess
[23:03] <jcoxon> a nova launch must be about £100
[23:03] <jcoxon> + meteor capabilites, additional helium for weight
[23:03] <jcoxon> and then launch platform for rocket etc
[23:04] <jcoxon> its going to be quite complicated to keep the rocket pointing up
[23:04] <riksta> what is the data comms link going to be?
[23:04] <jcoxon> the dicussions are lending towards having to spin the rocket rapidly to keep it straight at launch
[23:04] <riksta> that's the interesting part for me
[23:04] <jcoxon> 10mW 434mhz i guess
[23:05] <riksta> hehe a rifled rocket
[23:05] <jcoxon> thats whats been used at the mo
[23:05] <jcoxon> yeah its cause of the lack of air therefore fins don't work
[23:05] <riksta> yep
[23:06] <riksta> spinning sounds about as reasonable as you can get
[23:06] <riksta> bar directional jets
[23:06] <jcoxon> :-D
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[23:47] <_kc0wys> anyone still on?
[23:47] Nick change: _kc0wys -> kc0wys
[23:48] <jcoxon> yup
[23:52] <jcoxon> but i'm now off to bed
[23:52] <jcoxon> night all
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[00:00] --- Tue Oct 24 2006