highaltitude.log.20090912

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[14:07] <Laurenceb> hi
[14:11] <SpeedEvil> ih
[14:14] <rjharrison_> ..
[14:14] <rjharrison_> :)
[14:15] <rjharrison_> quick elec Q
[14:15] <rjharrison_> I want to know how much current is required to tigger camera using USB
[14:15] <rjharrison_> V = 3.3
[14:16] <SpeedEvil> ?
[14:16] <rjharrison_> R measured across the + - termainals of the usb connector plugged into the camera
[14:16] <rjharrison_> = 89.7k
[14:16] <SpeedEvil> oh - you mean with chdk?
[14:16] <rjharrison_> 3.3/89.7 Yep
[14:16] <SpeedEvil> yes - likely well under a milliamp
[14:16] <rjharrison_> Now the CHDK site says about .5amp
[14:16] <rjharrison_> I think bolox
[14:17] <rjharrison_> And that the uC can trigger the shutter
[14:17] <SpeedEvil> link
[14:17] <SpeedEvil> It depends.
[14:17] <SpeedEvil> If it's actually powering the camera - maybe
[14:17] <rjharrison_> Humm Now I read it it says 0.4mA
[14:17] <rjharrison_> It was late :)
[14:18] <rjharrison_> That should be OK to trigger direct from the uC
[14:18] <rjharrison_> 50mA max per pin iirc
[14:19] <SpeedEvil> yeah
[14:19] <SpeedEvil> Do check that it actually triggers at minimum microcontroleer voltage
[14:19] <rjharrison_> Yep it seems to suggest that 3v is too small I'm hoping 3.3v is enough]
[14:20] <rjharrison_> or it will have to be a mosfet
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[14:20] <rjharrison_> did fuzzylugnuts get his problem solved last night?
[14:25] <SpeedEvil> sort-of
[14:26] <SpeedEvil> I gave several suggestions that will work.
[14:34] <Laurenceb> aerolab is nice
[14:34] <Laurenceb> I've got it to export a lookup table of Cd values
[14:35] <Laurenceb> SpeedEvil: looks like a 1.7Kg GLOW rocket from 32Km works nicely
[14:36] <Laurenceb> the only possible problem is that it starts flying slightly sideways
[14:36] <Laurenceb> as its launched at 45 degrees to vertical
[14:36] <Laurenceb> but the angle of attack is <1 degree for most of the atmospheric flight
[14:37] <SpeedEvil> Shiny.
[14:39] <Laurenceb> the side effect of stage 1 burning so fast is its going up at over 2km/sec
[14:39] <Laurenceb> so its out of the atmosphere by the time it really starts to curve over
[14:39] <SpeedEvil> hmm - giving plenty of altitude
[14:39] <SpeedEvil> what's the apogee?
[14:39] <Laurenceb> 200Km
[14:39] <SpeedEvil> of stage 1
[14:39] <SpeedEvil> that's not bad
[14:40] <Laurenceb> you rig the launch system on the hab to set the rough apogee
[14:40] <SpeedEvil> that's what - a couple of years for a lowish density payload?
[14:40] <Laurenceb> hmm
[14:40] <Laurenceb> more like a few days for what I'm looking at
[14:40] <Laurenceb> Im not 100% sure, need to add a density lookup table
[14:41] <Laurenceb> but its going to be weeks maximum unless you have a better ballistic coefficient
[14:41] <Laurenceb> the rocket ends up about 58mm diameter and 800mm long
[14:42] <Laurenceb> huge balsa nosecone for the front 450mm
[14:43] <Laurenceb> CUSF are going for a rifled launch rail and fins, but similar design for their rocket to this first stage
[14:44] <Laurenceb> but they dont need to be nearly as accurate, just roughly up
[15:18] <Laurenceb> I get a 200x600km orbit with 10 grams payload
[15:18] <Laurenceb> using aerolab
[15:32] <Laurenceb> SpeedEvil: I was thinking startchaser would be the people to ask
[15:32] <Laurenceb> as they have built similar motors based on off the shelf propellant grains with modified cases before
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[16:29] Action: SpeedEvil wakes up.
[16:30] <SpeedEvil> Interesting - sorry I can't say anything more productive.
[16:30] <SpeedEvil> This again doesn't look insane - I can't really comment as the back-of-the-envelopes I've done agree
[16:35] <Laurenceb> the only thing I'm not sure about is the angle of attack
[16:35] <Laurenceb> and how that effects things
[16:36] <Laurenceb> most of the work is in building the gyro
[16:37] <SpeedEvil> If you get it wrong, the enemy can get off a broadside.
[16:37] <SpeedEvil> Hmm.
[16:37] <Laurenceb> the good news is you can easily build it for n prize budget
[16:37] <SpeedEvil> I'm - slightly more seriously - wondering about a teeny little gyrostab stage to stick on top of a pole
[16:38] <Laurenceb> what for?
[16:38] <SpeedEvil> To keep a USB stick inside a pringles can - or similar - on track - on the top of a bamboo pole.
[16:38] <Laurenceb> ?!
[16:38] <Laurenceb> why
[16:39] <SpeedEvil> On an related note - I got my 3G working.
[16:42] <Laurenceb> ah its on a pole?
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[16:45] <SpeedEvil> yes :/
[16:45] <SpeedEvil> On a related note - I'm off to kill the people who publish OFCOM mobile phone mast maps.
[16:45] <SpeedEvil> :/
[16:45] <SpeedEvil> _so_ stupid
[16:46] <SpeedEvil> There is no way of zooming out to 10km - showing all the masts I might be connected to - and looking at which are voda
[16:48] <SpeedEvil> You have to zoom out to 1km - then see how many phone towers are in that square - then zoom to 500m - seeing only one square at a time - to get a little map with tower icons - and then you have to zoom in again to 100m to actually be able to look at what they are.
[16:48] <SpeedEvil> _broken_
[16:50] <Laurenceb> why do you need G ?
[16:50] <Laurenceb> *3G
[16:50] <SpeedEvil> My DSL is still dropping out - and I have no easy way of getting it fixed.
[16:51] <SpeedEvil> As it would basically require the engineers to be there when the fault occurs - at 11pm-2AM
[16:51] <SpeedEvil> And even then it's possible it's external RFI that can't easily be fixed.
[16:51] <Laurenceb> ah
[16:51] <SpeedEvil> Hence - I want a backup connection.
[16:52] <SpeedEvil> Also - there is the risk they may say 'nope - your equipment - 160 quid please'
[16:53] <Laurenceb> yeah
[16:53] <Laurenceb> you have to sign up just to get a line installed
[16:53] <Laurenceb> we just had one installed and they drilled through the dpm
[16:54] <Laurenceb> I had to squirt a load of silicone in there
[16:55] <SpeedEvil> yeah. The installation people aren't very considerate anymore.
[16:57] <Laurenceb> ever used octave?
[16:58] <SpeedEvil> Nope.
[16:59] <SpeedEvil> I haven't gotten more heavily into maths analysis recently than is covered by some gnuplot and awk
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[17:04] <Laurenceb> ah think I got it
[17:04] <Laurenceb> trying to ork out how to do some 3D plots
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[17:33] <Laurenceb> http://imagebin.org/63598
[17:33] <Laurenceb> thats the accel in G - maxes out at about 250
[17:36] <Laurenceb> some of the fast burning motors can pull 500 with a light rocket, so it should stand up
[17:37] <Laurenceb> also its spun so theres 100G centripetal
[17:38] <Laurenceb> bbl
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[19:32] <edmoore> hi rjharrison_
[19:32] <edmoore> quick question for you
[19:33] <edmoore> infact, I have a couple of missed calls from you (sorry, haven't had my phone on me much) so I can call you back from landline if you're around?
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[20:37] <rjharrison_> Yo edmoore
[20:38] <rjharrison_> Back at the computer
[20:38] <rjharrison_> Will U load the prog
[20:38] <edmoore> hi rjharrison_
[20:38] <edmoore> greand, thank you
[20:40] <rjharrison_> edmoore you may be interested in this whilst you wait
[20:40] <rjharrison_> http://stereo.jpn.org/eng/sdm/index.htm
[20:41] <edmoore> ta
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[20:53] <rjharrison_> edmoore http://www.robertharrison.org/svn/listing.php?repname=the-icarus-project&path=%2Frelated-software%2Fgpstrack-0.1b%2F#path_related-software_gpstrack-0.1b_
[20:53] <rjharrison_> Either recompile or use the exisiting binary
[20:54] <rjharrison_> The script to do the magick is called track and change the 4 lines
[20:54] <rjharrison_> edit track
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[20:54] <rjharrison_> I assume you have foind your GPS device
[20:54] <rjharrison_> found
[20:59] <rjharrison_> ping edmoore
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[21:08] <edmoore> rjharrison_: yo
[21:08] <edmoore> (sorry it didn't ping)
[21:10] <edmoore> rjharrison_: excellent, thank you
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[21:56] <edmoore> natrium42: ping
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[23:17] <natrium42> oy
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[23:37] <ShellEvil> hi
[00:00] --- Sun Sep 13 2009