highaltitude.log.20070415

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[04:18] <mc-> hi ukhab, just been to a rocket static test in California, test lasted 109 secs....
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[09:24] <defy> hey jcoxon you around?
[09:31] <defy> did you have to do anything special to compile gnokii for the gumstix?
[09:37] <jcoxon> hey defy
[09:37] <jcoxon> will have to go in 5 mins
[09:37] <jcoxon> but is gnokii playing up?
[09:37] <jcoxon> i don't remember there being an issue
[09:37] <jcoxon> however
[09:37] <jcoxon> i also seem to reemmber that it didn't compile on more recent buildroots
[09:38] <jcoxon> what buildroot are you using?
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[09:44] <defy> hrm
[09:44] <defy> the latest :(
[09:44] <defy> is libusb required?
[09:45] <jcoxon> you should be able to comment that out
[09:45] <jcoxon> i use 1161
[09:45] <defy> so far, I'm just doing...
[09:45] <defy> export CC="/home/gumstix/gumstix-buildroot/build_arm_nofpu/staging_dir/arm-linux-uclibc/bin/gcc"
[09:45] <defy> ./configure --target=arm-linux --host=arm-linux --build=i386-pc-linux-gnu
[09:45] <defy> anything else required that you're aware of?
[09:45] <jcoxon> not sure
[09:45] <jcoxon> i haven't compiled it for awhile
[09:45] <jcoxon> though i will be in the next couple of days
[09:46] <jcoxon> do a ./configure --help
[09:46] <jcoxon> and check out hte settings
[09:46] <defy> yea i have, as far as i can tell the configure is working fine...
[09:47] <defy> but im failing on the make, apparently I'm missing libintl.h
[09:47] <jcoxon> oh right
[09:47] <defy> but I'm not sure if thats something that needs to be compiled into the buildroot, or my system
[09:47] <jcoxon> yeah that makes sense
[09:47] <jcoxon> i seem to remember i worked it out by googling it
[09:48] <jcoxon> either you can compile gnokii with out it with the correct configure
[09:48] <jcoxon> setting
[09:48] <jcoxon> or i found hte file and put it in the right place
[09:48] <jcoxon> i can't remember
[09:48] <jcoxon> sorry
[09:48] <jcoxon> (and i have to go
[09:48] <jcoxon> will bbl
[09:48] <defy> cool, okay..well that helps..ill keep at it
[09:48] <defy> thanks man :)
[09:48] <defy> cya
[10:50] <defy> hey jcoxon, when you're back..did you ever run into the error "./gnokii: can't resolve symbol '__cxa_atexit'" when running on the gumstix?
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[11:18] <defy> nm, got it working :D
[11:28] <Laurenceb> http://video.google.co.uk/videoplay?docid=-247659611589004030
[11:29] <Laurenceb> its a bit too dark :(
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[11:57] <jcoxon> defy, all working now?
[11:57] <defy> yup, cheers :)
[11:57] <jcoxon> cool
[11:58] <jcoxon> we should reall make a mk file and send it to craig to include as standard
[11:58] <defy> yea that would be cool
[11:59] <defy> i am now, however running into a problem where after sending a few text messages..the phone stops responding to the serial..and needs a reboot
[11:59] <defy> heh
[12:02] <defy> could be because my phone is running out of space though
[12:02] <jcoxon> what phone are you using?
[12:02] <defy> 5110
[12:02] <jcoxon> hmmmm
[12:03] <defy> so far, its only done it when the mailbox is full, so hopefully thats it
[12:03] <jcoxon> maybe its that
[12:03] <defy> i just cleared it, and am sending a bunch of tests..
[12:03] <defy> nope, just did it again..damn
[12:04] <defy> the init is timing out
[12:04] <jcoxon> in gnokiirc
[12:04] <jcoxon> are you using serial
[12:04] <jcoxon> as the protocol
[12:05] <defy> yeah
[12:07] <jcoxon> hmmm
[12:07] <jcoxon> i found that turning the phone on before the gumstix helps
[12:09] <jcoxon> but apart from that
[12:09] <jcoxon> i'm not sure
[12:09] <jcoxon> i have had issues
[12:10] <jcoxon> but if it works it works
[12:10] <defy> weird
[12:12] <jcoxon> i'll set up gnokii this evening on peg V
[12:12] <jcoxon> and will get back to you on my progress
[12:13] <defy> cool :)
[12:13] <defy> are you still using a 5110 also?
[12:15] <jcoxon> yeah
[12:15] <jcoxon> i find them the best
[12:15] <jcoxon> i'm still using the one from Peg I
[12:15] <jcoxon> this will be its 3rd flight
[12:17] <defy> hehe cool
[12:29] <defy> ah, it seems to crash the phone on really long txt messages
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[12:33] <mc-> hi jc
[12:33] <mc-> http://www.youtube.com/watch?v=y5Nj7Aorjrw
[12:34] <mc-> I was there
[12:50] <jcoxon> very cool
[12:50] <jcoxon> whats it for?
[12:51] <mc-> lunar lander challenge
[12:51] <mc-> $1M prize
[12:52] <jcoxon> oh wow
[12:52] <jcoxon> what team?
[12:53] <mc-> not sure of the team name
[12:53] <mc-> I think they're concentrating on building rather than naming
[12:55] <mc-> http://unreasonablerocket.blogspot.com/
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[12:58] <jcoxon> oh right
[12:58] <jcoxon> looks cool
[12:58] <jcoxon> right mc- sorry but i'm going to have to go offline
[12:58] <jcoxon> will chat soon
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[13:48] <msweeney> msg NickServ set email martin.sweeney@gmail.com
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[15:17] <edwardmoore> hi all (and msweeney !)
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[15:24] <msweeney> afternoon
[15:25] <icez> howdy
[15:25] <icez> it's getting so populated here :]
[15:25] Action: msweeney thinks he's sorted his registration woes
[15:34] <edwardmoore> what woes were they?
[15:34] <edwardmoore> oh, irc
[15:34] <edwardmoore> iirc :p
[15:35] <edwardmoore> ah, acronym jokes.
[15:38] <edwardmoore> so msweeney, do you have an idea what you'd like to take up on your maiden flight?
[15:39] <msweeney> woes were trying to figure out how to register ;-) I was just being inept
[15:39] Action: msweeney would like good quality photos, first of all
[15:39] <msweeney> curvature of the earth++
[15:40] <icez> a big balloon with a manned rocket on it and a trip to the moon and back?:)
[15:40] <edwardmoore> you should get curvature!
[15:40] Action: msweeney would like that muchly
[15:40] <edwardmoore> i reckon you could go for the altitude record
[15:41] <edwardmoore> if you pick a good day, there'd be no reason not to
[15:41] <msweeney> what is the record?
[15:41] <icez> well, a good day in the UK is pretty rare isn't?
[15:41] <icez> :P
[15:41] <edwardmoore> :P but yes fair point
[15:41] <edwardmoore> 32km
[15:42] <msweeney> ~104k ft?
[15:42] <edwardmoore> if you do a less inflated balloon, the ascent rate is slower but it'll reach is burst diameter at a higher altitude. so you need a good day simply because the flight will be longer
[15:42] Action: msweeney does everything in metric, apart from altitudes in feet
[15:42] <edwardmoore> 105,000 for nova 1
[15:42] <icez> metric pwnz
[15:42] <icez> :P
[15:43] <edwardmoore> however the guys from Make got theirs to 109,000
[15:43] <edwardmoore> so i reckon you should aim for that :)
[15:43] <icez> we need to beat those guys
[15:43] <icez> :p
[15:44] <msweeney> I have a subscription to make, but I never seem to get any issues
[15:44] <edwardmoore> hmmm
[15:44] <msweeney> alloon
[15:44] <edwardmoore> might be worth an email
[15:44] <msweeney> whoops
[15:44] <msweeney> how often do they come/
[15:45] <icez> edwardmoore, were you the one doing sun-heated balloon stuff?
[15:45] <edwardmoore> not sure, i don't subscribe
[15:45] <edwardmoore> nope, not I. I just did Nova for a bit and now am doing the parafoil stuff
[15:45] <edwardmoore> any generally any cambridge launches
[15:45] <icez> ok
[15:46] <icez> yeah, the university near by has a ballooning club
[15:46] <icez> they have some pretty advanced stuff
[15:46] <edwardmoore> really? awesome
[15:46] <icez> like modular flight computers and all that stuff :p
[15:46] <msweeney> I'd like to get the pictures, and test a GPS based tracker & sms stuff
[15:46] Action: msweeney oohs
[15:47] <edwardmoore> that's pretty cool. I reckon we could do an awful lot more if they'd let us fly decent radios
[15:47] <msweeney> what're the restrictions?
[15:47] <edwardmoore> msweeney, that sounds perfect. photos and a decent gps > groundlink and you'll be laughing
[15:47] <edwardmoore> limited to 10mW
[15:48] <edwardmoore> which is why we have baud rates from the old testament
[15:48] <icez> their records are around 90000 feets
[15:48] <edwardmoore> pffff :p
[15:48] <icez> yeah, we do have easier access to radio stuff here...:/
[15:48] <icez> it's sad
[15:49] <msweeney> what sort of baud do you get with 10mW?
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[15:50] <Laurenceb> Hi all
[15:50] <icez> hi Laurenceb
[15:51] <Laurenceb> I hope to try out peltier cooling later, but have to revise :(
[15:51] <icez> edwardmoore, but hey, 90000 isn't nothing, the world record is 170,000 feets :p
[15:51] <icez> that's like 1/2 of the "space line"
[15:51] <Laurenceb> arg finals at end of next term :(
[15:51] <icez> oops..
[15:51] <icez> isn't=is
[15:52] <msweeney> hrm, my exams are in fuor weeks
[15:52] <msweeney> really should start revising
[15:52] <icez> 3 weeks here
[15:52] <edwardmoore> 300 bps is what we tend to run at
[15:52] <edwardmoore> that's not agressive, could probs go higher, but tbh it's actually plenty to get the info we need
[15:52] <Laurenceb> yep thats what rocketboys system uses
[15:53] <edwardmoore> right, need to dash
[15:53] <edwardmoore> talk later
[15:53] <msweeney> tra
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[15:53] <Laurenceb> ultrahab is planned to get to 40km, not sure what that is in feet
[15:53] <icez> 131,233.596
[15:53] <icez> :)
[15:53] <Laurenceb> I'm going to write a much more sophisticated cutdown script
[15:54] <Laurenceb> thanx
[15:54] <Laurenceb> but I need to work out how you know if your inside a polygon?
[15:54] <icez> well
[15:55] <icez> if the points are inside the polygon?
[15:55] <Laurenceb> when you know the coordinates of the vertices
[15:55] <Laurenceb> yes, ie polygon marks out the coast
[15:56] <icez> http://www.acm.org/pubs/tog/editors/erich/ptinpoly/
[15:56] <icez> this might help
[15:56] <Laurenceb> just looking
[15:58] <Laurenceb> aha "crossings test" that looks simple enough
[15:59] <icez> yeah but it's limited shape-wise
[15:59] <Laurenceb> what sorts of shapes doesnt it like?
[15:59] <icez> concave shapes
[15:59] <icez> because you can have like 3+ crossings
[16:00] <icez> and still be inside
[16:00] <Laurenceb> but isnt it that if number is odd your inside?
[16:00] <icez> yeah
[16:01] <icez> but...
[16:02] <Laurenceb> trying with loads of weird shapes it seems to work
[16:02] <msweeney> that is clever
[16:02] <icez> oh
[16:02] <icez> uhm
[16:03] <icez> it does work :p
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[16:03] <msweeney> hola
[16:04] <Laurenceb> the maths for actually doing it is still hard
[16:04] <icez> it'd be easy if you used a shape that actually has an easy formula
[16:04] <icez> like a square, rectangle, circle, triangle :)
[16:04] <Laurenceb> guess youd have a horizontal "ray" and find the points of intersection with the lines at the edge
[16:05] <icez> or a combination of those
[16:05] <Laurenceb> humm british coast isnt a simple polygon
[16:05] <msweeney> vector calculus
[16:05] <icez> Laurenceb, make it a simple one?:)
[16:05] <icez> just don't draw exactly the coast :P
[16:05] <Laurenceb> that was my origional plan
[16:06] <Laurenceb> but it involves loads of faffing about with maps and rulers ect
[16:06] <msweeney> surely by the time it reaches the boundaries of the coast it's got potential to drift past them?
[16:06] <Laurenceb> I'll put the boundary approx 20 miles inland
[16:06] <Laurenceb> and also avoid london ect
[16:06] <icez> maybe using shapefiles and a tiny GIS toolkit that fits inside your gumstix :)
[16:07] <Laurenceb> erm i'm using avrs
[16:07] <icez> bah avrs then
[16:07] <Laurenceb> avrs are cheap :)
[16:07] <icez> avrs are cool:)
[16:07] <Laurenceb> also I now have avr-dos
[16:07] <icez> cool
[16:08] <Laurenceb> so several gig of storage potentially
[16:08] <Laurenceb> its very cool, you can connect a HDD straight onto the chip
[16:08] <icez> wow
[16:09] <Laurenceb> I'm using an sd card for better reliability in the cold
[16:09] <edwardmoore> msweeney, the usual tactic is to measure wind speed (your speed, given the balloon is like a massive sail you basically go at wind speed) at ascent rates, and know the descent rates under a parachute, and then work out where you would land if you were to cut down now
[16:09] <edwardmoore> and if that happens to be outside your polygon, you cut down
[16:09] Action: icez is building a 4-bit microcontroller for his CS class :p
[16:09] <edwardmoore> \it's not the simplest thing, probably needs some more work
[16:09] <Laurenceb> yep that is the plan for ultrahab
[16:09] <icez> but even if I built it out of parts...I don't think it would fit inside anything
[16:09] <icez> :P
[16:10] <Laurenceb> I had to do something similar a couple of years ago
[16:10] <edwardmoore> icez - . Many will rejoice because the Brushed Metal UI is gone
[16:10] <Laurenceb> but it was 8 bit
[16:10] <edwardmoore> whoops
[16:10] <edwardmoore> http://www.vttoth.com/vicproc.htm
[16:10] <icez> bargh
[16:10] <icez> edwardmoore, yeah, saw that
[16:10] <edwardmoore> it's cool isn't it
[16:11] <edwardmoore> kinda tempting
[16:11] <icez> http://www.homebrewcpu.com/
[16:11] <icez> this one is pretty.
[16:11] <icez> soo pretty
[16:11] <msweeney> edwardmoore sounds tricky
[16:11] <msweeney> well, not edwardmoore personally
[16:11] <edwardmoore> yeah, well, it's not actually desperatelly, it's just a load of adding vectors. is the kind of thing you spend a happy few hours doing with excel :)
[16:11] <icez> I already have the plans for most of it, I just need an instruction set and all:P
[16:12] <Laurenceb> homebrew cpu why??
[16:12] <Laurenceb> madness
[16:12] <icez> because it's fun.
[16:12] <icez> just like homebrew balloons :P
[16:13] <Laurenceb> but it wont fit in a balloon :(
[16:13] <icez> well...his is a bit more than a 4-bit one
[16:13] <icez> :P
[16:13] <icez> I need a computer that I can stick inside a rocket just like that
[16:13] <icez> but the cool parts aren't cheap
[16:13] <Laurenceb> I was trying to design a mechanical cpu
[16:13] <Laurenceb> using bike wheels
[16:14] <Laurenceb> but gave up, it was too hard
[16:14] <icez> I was thinking of building a babbage difference engine, looks big
[16:14] <icez> :P
[16:14] <Laurenceb> yes my problem was making it simple enough to make
[16:14] <msweeney> I'd like to be able to use my balloon system in my rockets, too
[16:14] <icez> but I don't think it would fit a balloon either:)
[16:14] <icez> yeah
[16:15] <icez> build a tiny "main computer" that works for multiple stuff
[16:15] <icez> configure, insert, launch!
[16:15] <icez> :)
[16:15] <Laurenceb> its called an avr
[16:15] <edwardmoore> pic
[16:15] <Laurenceb> or pic
[16:15] <icez> well I need an altimeter which looks like they sell for around 30$
[16:15] <edwardmoore> well the gps and radio should be no problem at all msweeney
[16:16] <icez> and then...something for the temp, gps, radio, etc..:P
[16:16] <Laurenceb> I was thinking about launching a rocket
[16:16] <edwardmoore> although we've never tested one under high g's
[16:16] <Laurenceb> need some M class motors :)
[16:16] <icez> actually since I'm doing crappy little rockets, I'd just need a little beacon
[16:16] <msweeney> I have a few big motors :D
[16:16] <msweeney> O6300s
[16:16] <icez> msweeney, like the top gear shuttle's one?:)
[16:17] <Laurenceb> think if you launched from 30km with M class motors it might work
[16:17] <msweeney> the very same, we used six of them
[16:17] <msweeney> trouble is, M motors loaded tend to weigh quite a lot
[16:17] <Laurenceb> well 4X1.5kg balloons should be it
[16:17] <edwardmoore> you could launch from 30km with anything as long as you got the right velocity!
[16:18] <msweeney> mhmm
[16:18] <Laurenceb> well looking at motors only K class or higher will be good enough
[16:18] <icez> anyone planning on tying balloons on a lawn chair?
[16:18] <icez> :P
[16:18] <Laurenceb> others are too inefficient
[16:18] <Laurenceb> I was thinking of making a man carrying rogallo
[16:19] <icez> my largest motor is a C6
[16:19] Action: icez hides
[16:20] <edwardmoore> lol. well they're still fun
[16:20] <msweeney> theyre acee
[16:20] <msweeney> right, am offski
[16:20] <edwardmoore> cya later
[16:20] <Laurenceb> http://wiki.ukhas.org.uk/_detail/projects:mihab:p4130055.jpg?id=projects%3Amihab%3Aglider&cache=cache
[16:20] <icez> stick a couple of them together maybe?:p
[16:20] <icez> Laurenceb, cool!
[16:20] <Laurenceb> that rogallo could be scaled up quite a lot
[16:21] <icez> looks like a miniature da vinci flying machine
[16:21] <icez> :p
[16:21] <Laurenceb> for man carrying
[16:21] <Laurenceb> I broke it :(
[16:21] <icez> :(
[16:21] <Laurenceb> overtightened one of the guy ropes
[16:21] <Laurenceb> but its suprisingly strong
[16:21] <icez> I broke my first RC airplane by smashing it on a neighbor's house
[16:21] <icez> booo
[16:21] <Laurenceb> and very stable
[16:22] <icez> and I have an RC helicopter, but it receives my wireless internet and goes crazy
[16:22] <Laurenceb> I've dismantled it to fit pitch control
[16:22] <Laurenceb> lol
[16:23] <Laurenceb> and make a new envelope, you can see it had some rips from crashes
[16:25] <Laurenceb> the cool think is if the c of g is moved to the back, it comes down like a parachute
[16:25] <Laurenceb> VTOL :)
[16:26] <icez> talk about multi-purpose
[16:26] <icez> :)
[16:26] <icez> you could make a staircase-descent
[16:26] <icez> glide-parachute-glide-parachute-glide-..
[16:26] <icez> :P
[16:27] <Laurenceb> it would be very nice, when it gets down to 100m or so above ground, servo adjusts guy lines ind it gently lands
[16:28] <Laurenceb> you could never do that with a conventional glider
[16:28] <icez> oh well, gotta leave IRC, too much distraction for homework :p
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[17:55] <Laurenceb> hi there
[17:55] Action: msweeney returns from the sun
[17:59] <msweeney> lawrenceb, that rogallo looks very cool. Where did you get your dimensions from?
[17:59] <Laurenceb> well, I just scaled up my prototype 5 times
[17:59] <msweeney> ah. how did you make your prototype?
[18:00] <Laurenceb> http://video.google.co.uk/videoplay?docid=-7947087481519535776&q=rogallo+balcony
[18:02] <Laurenceb> I just guessed really, it might be an idea to make it wider
[18:02] <Laurenceb> the trick is to get the c of g in the right place, thats what I used the prototype for
[18:03] <msweeney> would it be possible to mount it at a neutral point and use a servo operated movement to shift the Cg about?
[18:03] <Laurenceb> yes, thats what I'm working on
[18:03] <Laurenceb> a servo winch for boats would be good
[18:04] <Laurenceb> the prototype was vernerable to folding up, so there's a cross spar in the larger one
[18:05] <mc-> Lb, I haven't yet ordered the FMA modules, are you still on for one?
[18:05] <Laurenceb> yep
[18:05] <mc-> ok
[18:06] <Laurenceb> but its not needed for a rogallo
[18:06] <Laurenceb> I'm planning on having a rate gyro
[18:06] <msweeney> so I see - with the servo operated guys at the back, if there's a spar how does it pull in the wings?
[18:06] <mc-> I gave rocketboy a gyro, you're welcome to it, if you can put it to use
[18:07] <Laurenceb> an AD gyro?
[18:07] <mc-> it's a murata gyro, so it had some drift
[18:07] <Laurenceb> cool, need to get my peltier cooling rig working for calibration
[18:08] <Laurenceb> msweeney, there is a joint that allows the vertical spar to hinge
[18:08] <Laurenceb> its just a pice of aluminium with bolt hole
[18:08] <mc-> I reckon it's easier to periodically calibrate from a compass or a sun sensor
[18:09] <Laurenceb> hmm, according to ad you can calibrate them very well
[18:09] <Laurenceb> but if you dont calibrate, they go off by miles
[18:09] <Laurenceb> more than a murata would
[18:10] <mc-> were you planning to use the gyro to calculate heading, or with the GPS as well?
[18:10] <Laurenceb> combine gps and gyro
[18:11] <Laurenceb> was thinking of having a kalman filter
[18:11] <mc-> KFs are a project in themselves..
[18:11] <Laurenceb> but for the correct error treatment it would have to be run backwards and then forwards to pick up each gps measurement
[18:11] <Laurenceb> due to the lag
[18:12] <Laurenceb> so I've devised something close that approximates the error
[18:12] <Laurenceb> that would be too much for an avr
[18:12] <Laurenceb> it would have to go "offline" for several 100 ms each second
[18:12] <mc-> how about doing the heading calc on the ground, and then transmitting a correction back to the glider?
[18:13] <Laurenceb> arg having a radio reciever onboard would be a nightmare
[18:13] <Laurenceb> due to it drifting ect
[18:14] <mc-> I think software is difficult to test though, with a radio you can override the software, and send manual corrections
[18:15] <mc-> a radio wouldn't drift much, especially a ham receiver.
[18:15] <mc-> I've got a simple morse receiver for 7MHz, it's crystal controlled.
[18:15] <mc-> Don't mind sending that up in a balloon.
[18:16] <Laurenceb> hmm, rocketboy knows much more than me about radio
[18:16] <Laurenceb> problem would be the time lag
[18:16] <mc-> for the radio signal?
[18:16] <Laurenceb> well for processing it
[18:17] <Laurenceb> and for having a person think about it
[18:17] <Laurenceb> on the ground
[18:17] <mc-> true, but a time lag doesn't really matter
[18:17] <Laurenceb> you'd have to have some form of primary stabilisation on the plane
[18:18] <mc-> yes, perhaps 4 sun sensors then the plane would head roughly in the right direction
[18:18] <Laurenceb> hmmm, not convinced by sun sensors
[18:18] <Laurenceb> if the plane rolls/pitches they'll go off
[18:19] <Laurenceb> I've done a lot of work on heading control, my test flights worked very well in the end
[18:19] <Laurenceb> only reason the balloon flight failed is that it went into a spiral dive
[18:19] <mc-> I'll try to get another gyro this week, and send it to you.
[18:19] <Laurenceb> rogallos dont spiral dive unless you do something really bad to them
[18:20] <Laurenceb> cool thanx, what sort?
[18:20] <mc-> murata/panasonic again
[18:20] <Laurenceb> okay, is this in a rc control unit or loose?
[18:21] <mc-> loose
[18:21] <Laurenceb> I should have the glider back on monday
[18:21] <mc-> give it 5V and gnd, and it outputs 2.5V
[18:22] <Laurenceb> might have time to do some experiments with the flight computer
[18:22] <Laurenceb> what is the sensitivity?
[18:23] <Laurenceb> ie if its turning at 90 degrees/sec what is the voltage?
[18:26] <mc-> can't remember, but it's easy to connect to an ADC
[18:26] <Laurenceb> okay
[18:26] <Laurenceb> i'd better be off- revision
[18:27] <Laurenceb> going back to uni next weekend, have to leave balloon stuff until end of june as I've got exams
[18:28] <Laurenceb> cya all
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[22:04] <Laurenceb> hi all
[22:04] <Laurenceb> got a peltier cooler working :)
[22:05] <Laurenceb> down to -6 centigrade so far
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[22:09] <edwardmoore> hi all
[22:11] <Laurenceb> hi there
[22:11] <edwardmoore> all well?
[22:11] <Laurenceb> got the peltier working
[22:11] <Laurenceb> -6 centigrade
[22:11] <Laurenceb> think it'll be possible to get -15 with better fans
[22:12] <Laurenceb> but i'll need a higher voltage than 12v to get really cold
[22:13] <edwardmoore> yeah
[22:16] <Laurenceb> there are metal bolts holding it together, if they are replaced with nylon that'll also help a lot
[22:23] <Laurenceb> I could always get a freezer from the local recycling center and run the peltier inside
[22:27] <edwardmoore> iridium flare of mag -8 passing over me in 11 minutes
[22:27] <Laurenceb> I should try that
[22:27] <Laurenceb> where are you?
[22:30] <edwardmoore> west sussex
[22:30] <Laurenceb> what radius will it be visible over?
[22:30] <edwardmoore> would probs be pretty crap for anyone beyond a 20km radius
[22:30] <Laurenceb> oh guess I wont see it then
[22:30] <edwardmoore> 60km radius = mag -1
[22:30] <edwardmoore> down from -8 if overhead
[22:31] <edwardmoore> so its a hecka difference
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[22:42] <Laurenceb> spot it?
[22:42] <edwardmoore> mag -7 is damn bright!
[22:42] <Laurenceb> cool
[22:42] <edwardmoore> i almost had to squint
[22:43] <Laurenceb> I've got to try this
[22:43] <edwardmoore> they're damn cool, those.
[22:43] <edwardmoore> heavens-above.com
[22:43] <edwardmoore> gives you all of them in the next 7 days
[22:43] <edwardmoore> and everything else
[22:44] <Laurenceb> I'll give it a try
[22:44] <edwardmoore> it was incredibly yellow too
[22:45] <edwardmoore> i'll be sure to vid the next one
[22:45] <edwardmoore> space leaves me in wonderment
[22:45] <edwardmoore> just some old sattelites.... it's amazing
[22:53] <Laurenceb> was thinking of having iridium on payloads, but the phones are expensive
[22:53] <Laurenceb> bbl
[22:54] <edwardmoore> ok cya in a bit
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[23:09] <jcoxon> hey edwardmoore
[23:09] <edwardmoore> hi james
[23:09] <edwardmoore> let me convey my iridium flare story to you
[23:09] <edwardmoore> it is thus: i saw one at 10.39 and it was most impressive
[23:10] <jcoxon> wow
[23:10] <jcoxon> very cool
[23:11] <edwardmoore> i had to squint, infact. i thought 'it can't keep getting brighter' but it did. and 3 secs later it was gone
[23:11] <jcoxon> :-D
[23:11] <edwardmoore> how're u?
[23:12] <jcoxon> good thanks
[23:12] <jcoxon> though am a bit behind on my dissertation
[23:12] <jcoxon> will catch up this week
[23:12] <edwardmoore> i keep telling myself that
[23:13] <jcoxon> hee
[23:13] <jcoxon> i really need to
[23:13] <jcoxon> once i get going it shouldn't take too long
[23:13] <jcoxon> just a matter of writing it up
[23:14] <jcoxon> did you look at mt design for depolyment?
[23:14] <jcoxon> deployment*
[23:14] <edwardmoore> yes. i like it and also agree with steve
[23:16] <jcoxon> about the drogue needing to have ore drag?
[23:16] <jcoxon> more*
[23:17] <Laurenceb> jcoxon, have you heard about my plan for a rogallo descent?
[23:17] <jcoxon> Laurenceb, i've read about it
[23:17] <jcoxon> moving the c of g back?
[23:17] <Laurenceb> yes, the video is too dark
[23:18] <Laurenceb> looked okay before it was uploaded :(
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[23:40] <jcoxon> right i'm off to bed
[23:40] <jcoxon> night all
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[23:47] <Laurenceb> cya all
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[00:00] --- Mon Apr 16 2007