highaltitude.log.20070224

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[08:33] <jcoxon> morning all
[08:45] <jcoxon> its ooo so quiet...
[08:46] <jcoxon> ukhas have been asked to add some medical high altitude links to our website
[08:46] <jcoxon> what do people think?
[08:46] <jcoxon> http://www.altitudephysiology.org/main.htm
[08:47] <jcoxon> www.hape.org.uk
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[09:10] <Golfgeo> Hi all
[09:17] <jcoxon> hey Golfgeo
[09:17] <jcoxon> hows it going?
[09:25] <Golfgeo> Great I bought the nslu2 yesterday :-)
[09:25] <Golfgeo> That thing is tiny
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[09:25] <Golfgeo> Have a 4 gig Corsair Voyager on backorder though :-(
[09:26] <Golfgeo> Looking into solarpannels and GPS receiver. But haven't found anything I like... Well, not yet that is...
[09:26] <Golfgeo> I have a name for the project though :-)
[09:27] <Golfgeo> Prins Research Instruments Near Space :-)
[09:27] <Golfgeo> Recursive so it should be a good one and also my sir name :-)
[09:28] <Golfgeo> And taking a course in applied design at school (Autodesk Inventor) so I can model the thing on a computer before a build...
[09:30] <Golfgeo> Whats up with you guy's?
[09:30] <Golfgeo> Or better whatsup?
[09:33] <Golfgeo> I do have to say that hobby stuf just isn't availible here in Holland.
[09:34] <jcoxon> ooo that sounds cool
[09:35] <Golfgeo> The name?
[09:35] <jcoxon> i'm in the process of building Peg V
[09:35] <jcoxon> yup
[09:35] <Golfgeo> Thanks mate Happy with it to :-)
[09:35] <jcoxon> this afternoon off to cut a case out of blue foam in the engineering department
[09:35] <Golfgeo> How's the build going?
[09:35] <jcoxon> got everything assembled so its a matter of wiring it all together
[09:36] <Golfgeo> Ah, there open on saturday's
[09:36] <Golfgeo> ?
[09:37] <jcoxon> yeah
[09:37] <jcoxon> can't see why i won't be ready to launch in a couple of days
[09:37] <jcoxon> just will need to sort out the code
[09:37] <Golfgeo> Thats great
[09:38] <Golfgeo> Got all the sensors working?
[09:38] <jcoxon> well i've got my digital compass working
[09:39] <jcoxon> but i don't have my accelerometers
[09:39] <Golfgeo> Whats the resolution on it?
[09:39] <jcoxon> when i get them i'll add them though they aren't vital
[09:39] <Golfgeo> ah, ic
[09:39] <jcoxon> ummm not actually sure - one sec i'll have a look
[09:40] <jcoxon> the resoluton is 0.1degree
[09:40] <jcoxon> and accuracy is 3-4 degrees after callibartions
[09:41] <Golfgeo> WaWait a moment, are you using a adc or reading it via an digital interfase?
[09:41] <Golfgeo> *Wait
[09:41] <jcoxon> i2c
[09:41] <jcoxon> but i assume that there is an onboard pic reading through analog
[09:41] <Golfgeo> Yea, should be
[09:43] <Golfgeo> I've looked into compasses, but the once with high accuracy are a bit expensive.
[09:45] <Golfgeo> Going to a r/c hobby shop next week and see what kind of materials I can get there.
[09:46] <jcoxon> cool - i ordered mine off the internet
[09:46] <jcoxon> its easy to work with
[09:46] <jcoxon> even had linux code
[09:46] <Golfgeo> thats great
[09:47] <Golfgeo> You should fly a vibration sensor too
[09:47] <Golfgeo> (Piezoelectric)
[09:49] <Golfgeo> Personaly im a bit skittish on ordering oversees and the stuff one can get here just isn't that great...
[09:50] <mc-> hi jcoxon, shall I order some more helium?
[09:52] <jcoxon> hey mc-
[09:52] <jcoxon> hmmm - not yet
[09:52] <jcoxon> the cambridge guys have said we can use theirs
[09:52] <jcoxon> they get it free from the department
[09:52] <mc-> that's great
[09:52] <jcoxon> but
[09:53] <jcoxon> it means we can only use it when launching from churchill
[09:53] <jcoxon> so not steve's site
[09:53] <jcoxon> mc-, what are your plans now?
[09:54] <mc-> I need to make a few improvements on my payload
[09:54] <jcoxon> right
[09:55] <mc-> Hopefully rocketboy can change the antenna
[09:55] <mc-> not sure why it stopped last time
[09:55] <mc-> it shouldn't get that cold
[09:56] <mc-> unless there's a leak in the box
[09:57] <jcoxon> it stopped a little to early for it to be cold issues
[09:58] <mc-> ah, ok
[09:58] <mc-> so something else went wrong.
[09:59] <mc-> so it wasn't working when the payload landed?
[09:59] <jcoxon> not that i know of
[09:59] <jcoxon> i wasn't tracking it though
[09:59] <mc-> I don't think I turned on the pic watchdog
[10:00] <mc-> but I doubt the pic crashed
[10:01] <jcoxon> not sure
[10:02] <mc-> I want to also get my cutdown working well, so there's plenty of things to fix
[10:05] <mc-> rocketboy has got one of my balloons, it's a small one, I need a parachute to have a complete payload.
[10:06] <mc-> Where do you get chutes from?
[10:06] <mc-> aeroconsystems.com has some cheap chutes
[10:08] <jcoxon> ummm i can't actually remember
[10:08] <jcoxon> some rockey shop
[10:08] <jcoxon> rocket*
[10:09] <mc-> they are $3 for an 18" chute
[10:09] <mc-> I might buy 10 of them at that price..
[10:09] <jcoxon> wow
[10:09] <jcoxon> cheap
[10:10] <Golfgeo> have a look at this one: http://aeroconsystems.com/motors/lr101.htm
[10:10] <mc-> it's not worth recovering the payload now, with such a cheap chute
[10:12] <jcoxon> hmmm i think its alway worth recovering the payload :-)
[10:15] <mc-> I should say 'my' payload, as it's built to be cheap..
[10:15] <jcoxon> but still we don't really want to litter the country with payloads
[10:16] <jcoxon> that could be mistaken by walkers for a whole range of security risks
[10:16] <mc-> true
[10:17] <mc-> I'm still thinking about a expendable rockoon which drops in the sea
[10:17] <jcoxon> i think thats quite a good idea
[10:17] <jcoxon> rockoons over land scare me
[10:18] <mc-> agreed, I don't want to risk hitting anyone
[10:19] <jcoxon> so would the plan be to release the balloon from the coast
[10:19] <jcoxon> let it drift out and up
[10:19] <jcoxon> and then ignite at say 30km
[10:19] <mc-> yep
[10:20] <jcoxon> that way also it wouldn't take much for us to upgrade to having a retrieval boat
[10:20] <mc-> or if there's a steerable chute, then it could make it's way back to land
[10:20] <mc-> if the steering doesn't work, it drops in the sea
[10:21] <jcoxon> i like the idea
[10:21] <jcoxon> we'd also loose the launch platform i guess
[10:22] <mc-> yes, but I think the launcher is a rod, at least initially.
[10:22] <jcoxon> the cambridge guys are at the moment constructing a tube launcher
[10:22] <jcoxon> actually its nearly done
[10:23] <jcoxon> they are going to first fly it with out a rocket
[10:23] <jcoxon> to see how it flys
[10:23] <mc-> a tube launcher sounds expensive? unless it's a cardboard tube?
[10:24] <Golfgeo> I read about that project somewhere...
[10:24] <jcoxon> oh its just a cardboard tube
[10:25] <jcoxon> but it also has an aerobrake
[10:25] <jcoxon> and 3 parachutes
[10:25] <jcoxon> plus an avionics package
[10:25] <jcoxon> its not meant to be lost
[10:25] <jcoxon> i'm not exactly sure what the final plans to launch
[10:25] <jcoxon> but i suspect it will be overland
[10:26] <mc-> so I might still have a chance to beat them, assuming they have trouble getting permission to launch
[10:27] <jcoxon> :-)
[10:27] <jcoxon> hmmm
[10:27] <jcoxon> i personally think no one should be anywhere near launch
[10:27] <jcoxon> still tons of things to work out
[10:29] <jcoxon> right will bbiab
[10:29] <mc-> I'm just looking at http://www.aeroconsystems.com/tips/descent_rate.htm
[10:31] <mc-> an 0.5lb payload hits the ground at 16mph with a 18" chute
[10:32] <mc-> bbl
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[19:45] <jcoxon> evening all
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[20:29] <phatmonkey> evening!
[20:30] <jcoxon> hey phatmonkey
[20:35] <jcoxon> phatmonkey, its about time you launched something :-p
[20:35] <phatmonkey> it is... it is...
[20:38] <jcoxon> did you get my email?
[20:43] <phatmonkey> yeah
[20:43] <phatmonkey> rather busy at the moment
[20:43] <jcoxon> np
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[00:00] --- Sun Feb 25 2007