highaltitude.log.20090820

[00:00] <edmoore> oh *wow*
[00:00] <edmoore> I am buying some of them
[00:00] <ShellEvil> LVDS I assume
[00:00] <edmoore> they're probably better than mems
[00:00] <hallam|autokite> probably
[00:00] <hallam|autokite> LVDS?
[00:00] <edmoore> just minus the convenience of rate = k*Voltage
[00:01] <Laurenceb> hmm yeah nice and cheap
[00:01] <ShellEvil> 50-100g?
[00:01] <hallam|autokite> edmoore, you can have them shipped to me and I'll bring them over in sept if you want to save on shipping
[00:01] <Laurenceb> I was looking for a control moment gyro for second stage of an n prize rocket
[00:01] <ShellEvil> hallam|autokite: think a transformer with variable phase output.
[00:01] <Laurenceb> I may be interested as well
[00:01] <ShellEvil> hallam|autokite: you excite the transformer, and you get a couple of phase outputs
[00:02] <ShellEvil> the phase determines the position
[00:02] <JimAM> thanks for all the info fellas, think I'm done for the night
[00:02] <JimAM> bye for now
[00:02] <hallam|autokite> what does it stand for?
[00:02] <hallam|autokite> bye JimAM
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[00:03] <ShellEvil> Linear Variable something something
[00:03] <ShellEvil> http://en.wikipedia.org/wiki/LVDT
[00:03] <hallam|autokite> ah
[00:03] <ShellEvil> linear variable differential transformer
[00:03] <hallam|autokite> I think I've seen accelerometers that use this
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[00:05] <Laurenceb> ah i get the idea
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[00:05] <Laurenceb> so basically a brushless motor with the coils forming part of an LVDT
[00:05] <ShellEvil> It's very neat.
[00:05] <Laurenceb> and the gyroscopically induced displacement gives a rate output
[00:05] <ShellEvil> _somewhere_ I've got a book that goes into these.
[00:05] <hallam|autokite> nice
[00:05] <hallam|autokite> ok I'm going to sign off so I can get some work done
[00:06] <hallam|autokite> ttyl
[00:06] <ShellEvil> wve
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[00:12] <Laurenceb> http://pro38.com/products/pro75/motor/MotorData.php?prodid=2486K510-P <- I was wondering if you could go small enough to use that as a first stage
[00:13] <ShellEvil> hmm
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[00:13] <ShellEvil> Tiny.
[00:16] Nick change: ShellEvil -> SpeedEvil
[00:17] <Laurenceb> its just verging on workable to use that
[00:17] <Laurenceb> bbl
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[00:43] <Laurenceb> about 1.9Kg GLOW
[00:52] <SpeedEvil> Insane if it's possible
[00:53] <Laurenceb> air resistance is a pain
[00:53] <Laurenceb> but you can get a bit higher
[00:53] <Laurenceb> ~ 33Km or so
[00:53] <Laurenceb> only a 10gram payload
[00:53] <Laurenceb> then about 58mm diameter and 700mm long
[00:54] <Laurenceb> spin to ~ 300rpm, launch, firing seperates at 150km and second stage flies free, then second stage repositioned by gyro for ignition at 200km
[00:54] <Laurenceb> about 500gram fuelled mass for the second stage
[00:55] <Laurenceb> you lose 500m/s to drag
[00:55] <SpeedEvil> that's not really horrible
[00:56] <Laurenceb> ditching latex balloons and going for polythene to get 40Km launch or so helps
[00:56] <SpeedEvil> A 0th stage with 300m/s or so ?
[00:56] <SpeedEvil> though that makes positioning harder
[00:56] <Laurenceb> yeah
[00:56] Nick change: KingJ -> kingj
[00:57] <Laurenceb> most parts scale
[00:57] <Laurenceb> so it makes sense to make the gyro and tronics as light as possible
[00:57] <Laurenceb> I think a 20 gram gyro system is possible
[00:59] <Laurenceb> oh well gtg, cya
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[09:16] <edmoore> hi rjharrison
[09:16] <edmoore> I think a noon launch might be off
[09:18] <hallam|navfilter> edmoore: what time are you thinking?
[09:18] <edmoore> depends on when uplink comes back to life
[09:19] <edmoore> it's magically stopped working
[09:19] <hallam|navfilter> oh no, did it just spontaneously stop working after you changed something?
[09:19] <hallam|navfilter> (or didn't even change anything)
[09:20] <hallam|navfilter> I am tracking 6 satellites from *indoors*
[09:20] <edmoore> iain and fergus have gone to catch some zzz's in the vague hope that that might re-sharpen minds, and I am doing a bit of badger2 just because it has to be sent off tomorrow come what may, whereas cub just needs to go up asap but not as urgently
[09:21] <hallam|navfilter> maybe you guys should just skip to friday thenb
[09:21] <edmoore> I got some zzz's after i crashed from all the coffee and was put to bed by the other two apparently delierious and with red-eye. Man that stuff is good.
[09:21] <rjharrison> Ok edmoore, I'll watch this spcae
[09:21] <rjharrison> ulink sounds col
[09:21] <rjharrison> cool
[09:21] <edmoore> well it only needs one of us (me) on badger2. It's just that sort of asymptotically approaching completion thing
[09:22] <edmoore> as we don't need cub back, we can easily sly it this eve
[09:22] <edmoore> fly*
[09:22] <edmoore> into sunset
[09:22] <rjharrison> on slow ascent rate?
[09:22] <rjharrison> Can test that float thing again too
[09:23] <edmoore> probably not
[09:24] <edmoore> just kiss
[09:24] <edmoore> although we will give it a fairly slow ascent rate
[09:24] <rjharrison> Ok but will you get range if it goes up to quick
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[09:25] <hallam|navfilter> ok night all
[09:26] <edmoore> night hallam|navfilter
[09:26] <edmoore> we'll get range :)
[09:27] <rjharrison> lol
[09:29] <edmoore> 3m/s to 25km launching at 7pm tonight
[09:29] <edmoore> even further out to see
[09:29] <edmoore> maybe 150km east of scarborough
[09:43] <rjharrison> cool
[09:43] <rjharrison> Norway
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[14:06] <rjharrison> .
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[16:50] <SpeedEvil> edmoore: http://nmp.nasa.gov/st6/TECHNOLOGY/star_camera.html
[16:51] <edmoore> i see your game
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[17:11] <hallam|navfilter> hi folks
[17:11] <hallam|navfilter> did the launch go ahead?
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[19:37] <SpikeUK> ping edmoore - I do not want to interupt, but are you likely to launch this evening please?
[19:37] <edmoore> SpikeUK: It's looking increasingly unlikely
[19:37] <edmoore> There's a bug that basically means you can't multiply anything by 10 with this compiler - at least that's what it seems
[19:37] <edmoore> there's a lot of hair on the floor here
[19:38] <SpikeUK> edmoore - thanks for that! I'll leave you in peace - good luck to you CUSF chaps!
[19:39] <edmoore> thank you - it's being one of those days
[19:39] <edmoore> sorry for not communicating much!
[19:40] <SpikeUK> No problems! Your priorities are clear! G8IPN standing by ;-)
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[19:43] <SpeedEvil> Fight the decimal hegemony!
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[19:47] <SpikeUK> SpeedEvil - base 11 that's what we want ;-)
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[21:00] <hallam> edmoore: I'm sorry Heisenbugs are bothering you. I have some of my own.
[21:05] <edmoore> hallam: i'm just doing the glorious home straight on badger 2 currently
[21:05] <edmoore> it's all sort of clicking together
[21:06] <edmoore> number of air wires of the same order as number of fingers, lots of them trivial
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[21:34] <hallam> there'll be a 2nd revision, right?
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[21:34] <hallam> in which I can fix the GPS front end
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[21:40] <edmoore> hallam: what is wrong with it currently?
[21:40] <SpeedEvil> :)
[21:44] <hallam> well maybe it's fine but I think I want to dick with the RF stuff
[21:44] <hallam> I think we should have a passive patch antenna right by the front end
[21:45] <hallam> don't wait on the first rev boards though
[21:45] <hallam> I can get joby to fund the 2nd rev if necessary
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[22:38] <rjharrison_iphon> Hi Ed
[22:38] <rjharrison_iphon> On iPhone
[22:39] <rjharrison_iphon> I guess cub is not good
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[23:41] <Laurenceb> hi
[23:42] <Laurenceb> edmoore: the CC1111 - how are you generating RTTY?
[23:43] <Laurenceb> by changing the carrier and sending no data?
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[00:00] --- Fri Aug 21 2009