highaltitude.log.20070623

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[11:40] <edwardmoore> hi rocketboy
[11:43] <Laurenceb> hi all
[11:43] <edwardmoore> hi laurenceb
[11:43] <Laurenceb> finally got polygon based cutdown code working
[11:43] <Laurenceb> arggg
[11:44] <Laurenceb> trying to be too clever....
[11:44] <edwardmoore> how did you do it?
[11:44] <Laurenceb> I was using temporary variables stored on a stack
[11:44] <Laurenceb> and didnt allocate enough stack size
[11:45] <Laurenceb> Using the jordan curve theorem, find how many times a horzontal line from the point will intersect with the polygon
[11:45] <Laurenceb> if its odd the its inside if even outside
[11:46] <edwardmoore> lol
[11:46] <edwardmoore> have atmospheric model are you using?
[11:46] <edwardmoore> have -= what
[11:46] <edwardmoore> -= = =
[11:46] <Laurenceb> havent written that yet
[11:46] <Laurenceb> I'll just use exponential pressure
[11:47] <Laurenceb> and work out the drag coefficient of my chute
[11:47] <Laurenceb> exp(-h/15.6km)
[11:47] <Laurenceb> works well enough I think
[11:48] <edwardmoore> cool
[11:48] <edwardmoore> well steve/nasa's model apparently works quite nicely for approximating atmospheric density
[11:48] <Laurenceb> I used a similar chute on mihab1
[11:48] <edwardmoore> it splits the atmosphere up into 3 bands
[11:49] <Laurenceb> and got the decent rate to be 2.43m/s
[11:49] <edwardmoore> oh btw laurence you'll like this if you've not seen it
[11:49] <edwardmoore> you know the canadian glider chap?
[11:49] <Laurenceb> so can work out the drag coefficient from that
[11:49] <Laurenceb> yes
[11:49] <Laurenceb> seen his site
[11:49] <edwardmoore> have you seen his newer-ish site?
[11:49] <edwardmoore> with the stuff on balloon ascent rates
[11:50] <Laurenceb> yes briefly
[11:50] <edwardmoore> the reynolds number thing
[11:50] <edwardmoore> fascinating
[11:53] <Laurenceb> be back this evening
[11:53] <Laurenceb> cya
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[11:53] <edwardmoore> cya
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[12:04] <jcoxon> hey all
[12:09] <jcoxon> rocketboy, we've started work on the navigation code
[12:09] <jcoxon> and i've bid for a nokia mobile phone
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[12:14] <jcoxon> morning phatmonkey ]
[12:15] <phatmonkey> morning jcoxon!
[12:15] <phatmonkey> now exams are out of the way, i'd love to get stuck in to something
[12:15] <phatmonkey> not really sure what i can help with though
[12:15] <jcoxon> you should come along to a launch
[12:15] <jcoxon> good first step
[12:16] <phatmonkey> totally, yeah
[12:17] <jcoxon> hopefully will launch 1st july
[12:21] <jcoxon> will bbiab - lunch time
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[13:01] <mc-> hi rocketboy
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[13:02] <jcoxon> hey mc-
[13:03] <jcoxon> wow 13 people
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[13:10] <jcoxon> 14!
[13:10] <jcoxon> :-d
[13:11] <edwardmoore> ???
[13:11] <edwardmoore> oh yeah
[13:11] <edwardmoore> it's scary
[13:12] <edwardmoore> what's happened d'ya reckon?
[13:12] <edwardmoore> it's almost like this is turning into an actual hobby
[13:12] <jcoxon> not sure
[13:12] <jcoxon> yeah there is a risk of that
[13:12] <edwardmoore> i have an idea to feed you
[13:12] <jcoxon> hehe and the channel is nearly completely silent
[13:12] <jcoxon> shoot
[13:12] <edwardmoore> but it might be better discussed in a more hush place
[13:12] <jcoxon> oh right
[13:13] <jcoxon> can you do DCC chat?
[13:13] <edwardmoore> i've ccepted but it's still 'waiting for a conection'
[13:14] <edwardmoore> we could go to highaltitude99
[13:14] <jcoxon> you
[13:14] <jcoxon> yup*
[13:14] <jcoxon> sorry everyone else :-D
[13:14] <jcoxon> brb
[13:17] <jcoxon> back
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[13:18] <jcoxon> anyone good with C and serial ports on linux?
[13:37] <mc-> I can do C and serial ports but not linux
[13:37] <mc-> why?
[13:54] <rocketboy> bbl
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[14:42] <jcoxon> hey edwardmoore
[14:42] <edwardmoore> hey jcoxon
[14:42] <jcoxon> made some progress with the parser
[14:42] <jcoxon> have got it to get individual lines
[14:43] <jcoxon> and also start splitting up the sentances
[14:43] <edwardmoore> cool
[14:43] <edwardmoore> so not using gpsd?
[14:44] <jcoxon> nah
[14:44] <jcoxon> its not worth it
[14:44] <jcoxon> i've got to the point where i'm able to start extracting float values
[14:44] <edwardmoore> ok cool
[14:44] <edwardmoore> that's basically it then
[14:46] <edwardmoore> no order through yet
[14:46] <jcoxon> is it coming home or to churchill?
[14:46] <jcoxon> cause be prepared to pay the VAT on delivery
[14:47] <edwardmoore> home, and yes
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[14:48] <edwardmoore> might get it ent to a friend in the states and get him to send it as a gift in future
[14:48] <jcoxon> yeah
[14:50] <jcoxon> hmmmm mac os x serial stuff is lame
[14:50] <edwardmoore> yeah it makes me miss windows
[14:50] <jcoxon> winodws yuk
[14:51] <jcoxon> linux - much happier with
[14:51] <edwardmoore> no one can beat hyperterm
[14:51] <jcoxon> pah
[14:54] <jcoxon> right i'll be back later
[14:54] <edwardmoore> ok cya letrr
[14:55] <jcoxon> should be in a position to be able to give you your floats by this evening
[14:55] <jcoxon> though will need the gps unit to properly test it
[14:55] <edwardmoore> that'd be grand
[14:55] <edwardmoore> i'll be driving back this eve
[14:55] <jcoxon> not sure this unit will be able to cope with anything mor the GPRMC
[14:55] <jcoxon> cya
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[17:12] <mc-> when's the next launch planned?
[17:12] <edwardmoore> july 1st i believe
[17:13] <mc-> 1 week...I'm not going to have my rocket payload ready by then
[17:13] <mc-> using estes A motor
[17:13] <jcoxon> Sun 1st July is the next time we have permission to launch
[17:13] <mc-> have you got helium?
[17:16] <jcoxon> ummmm not sure
[17:16] <jcoxon> I think rocketboy has a tank already
[17:16] <jcoxon> will start organising the launch tomorrow
[17:18] <mc-> I've got a balloon somewhere, but I'll need to send it by Wed.
[17:20] <mc-> bbl
[17:21] <edwardmoore> jcoxon- how's it going?
[17:22] <jcoxon> ummm getting there
[17:23] <jcoxon> nearly finished decoding the GPRMC sentence using strtok
[17:23] <jcoxon> though need to add in some error control or it seg faults when there isn't a log
[17:23] <edwardmoore> yeah i discovered that
[17:25] <jcoxon> sorted
[17:25] <edwardmoore> is there a simple enough work around?
[17:25] <jcoxon> yeah
[17:26] <edwardmoore> care to share?
[17:26] <jcoxon> the string has either A or V in the third position
[17:26] <jcoxon> so if its A it carries on splitting the sentance
[17:26] <jcoxon> if not it prints "No Lock"
[17:27] <edwardmoore> neat
[17:27] <edwardmoore> cool
[17:27] <mc-> by the way, you can decode NMEA as fixed length tokens
[17:28] <edwardmoore> what if you have nulls?
[17:28] <mc-> the lat and lon should be still a fixed length
[17:29] <edwardmoore> but subsequent things may not be
[17:29] <mc-> yes
[17:30] <edwardmoore> ...
[17:30] <jcoxon> ummm if its nulls then it'll still carry on right now :-D
[17:31] <jcoxon> edwardmoore, what are the sentances we need?
[17:31] <mc-> any rocket plans, edwardmoore?
[17:31] <edwardmoore> well gga and vtg would be the two i think
[17:31] <jcoxon> okay
[17:32] <edwardmoore> i think rocket might come after parafoil atm, as the two sort of work that way on the vague mental roadmap of progress
[17:32] <mc-> sounds sensible
[17:33] <mc-> are you planning on flying the parafoil already deployed?
[17:33] <mc-> so the lines can't get twisted
[17:33] <edwardmoore> too easy :)
[17:34] <edwardmoore> nah i think deployment is a hurdle that needs to be got over
[17:34] <edwardmoore> rather than side-stepped
[17:34] <mc-> it will be a major step forward to get the payload returning to a spot
[17:34] <edwardmoore> regretfully i need to now start my drive back to cambridge, so i think i'll have to go
[17:35] <edwardmoore> drive up tonight, back down again tomorrow then that's it
[17:35] <mc-> coming past g'ford?
[17:35] <edwardmoore> not really- tend to take the m23 from horsham
[17:35] <edwardmoore> a3 is a wee bit west
[17:36] <mc-> I've driven to camb and back too many times..
[17:36] <edwardmoore> it gets a little boring now
[17:36] <edwardmoore> especially as dartford is a bit dodgy at the minute
[17:36] <edwardmoore> oh well. i'll see you uys later
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[17:37] <mc-> jc, are you just using GPS to control the parafoil?
[17:37] <mc-> bbl
[17:38] <jcoxon> well thats the first step of the software
[17:38] <mc-> and controlling a single servo for steering?
[17:39] <jcoxon> well yes/no
[17:39] <mc-> I think like your rudder idea for steering
[17:39] <jcoxon> we are first going to test with a lifting body
[17:39] <jcoxon> which will have a single servo and a ruddar
[17:39] <jcoxon> rudder*
[17:39] <jcoxon> but for the parafoil it'll be 2 servos attached to the brake lines
[17:39] <jcoxon> allows us to flare the parafoil as well
[17:40] <mc-> how about a parafoil filled up with some bits of polystyrene, so it holds its shape?
[17:42] <jcoxon> interesting
[17:42] <mc-> bbl
[18:34] <icez> http://www.thisislondon.co.uk/news/article-23401615-details/'Mile-wide+UFO'+spotted+by+British+airline+pilot/article.do
[18:35] <icez> (:
[18:50] <Tiger^> hehe
[18:51] <Tiger^> "they said it was a weather balloon"? ;)
[18:52] <icez> that would be one huge weather balloon :)
[18:53] <Tiger^> yeah ;)
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[21:35] <Sbear> Lot on tonight.
[21:37] <Sbear> Hi everyone.
[21:37] <icez> hello
[21:38] <Sbear> any idea what is being launched (if the weather is ok) on the 1st July?
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[21:42] <icez> nope
[21:43] <Sbear> ok, re the lifting body
[21:43] <Sbear> I have recently been launching
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[21:44] <Sbear> paper darts, from my kite that are based on the XB 70 Valkirie bomber from the 60's
[21:45] <Sbear> They have flown MUCH beter than the normal type. Flights of 25 secs from a drop height of about 80 ft.
[21:45] Nick change: Superkuh_ -> Superkuh
[21:46] <Sbear> Normal flight time about 10 secs, from the same hight.
[21:48] <Sbear> Would be interesting to see how a large polystyriene(spelling) one would work as a test idea.
[21:57] <Sbear> XB 70 design for a Mach 3+ bomber. Two built, one crashed during a photo shoot. Other on show somewhere in the U.S.A.
[21:58] <Sbear> Used 'wave riding' as part of flight design. Wingtips (Delta wing) droped down at high speed traping air under them, and boosting lift.
[22:00] <Sbear> Darts are made with folded down wing tips and even though they fly slowly, seem to exibit the same 'wave riding' type efect,
[22:01] <Sbear> due to the longer flights. I have launched a normal and XB type dart together, and the XB type dart droped slower than the normal one.
[22:02] <Sbear> Both were of the same size and weight, so there could be a good comparison of flight time.
[22:08] <Sbear> who is borism
[22:09] <Sbear> Whoops!! ment to find out if there are any UK based pepole on here. Forgot to put the / D'oh!
[22:11] <Sbear> whois attila
[22:13] <Sbear> AAAGGGHH done it again!!! Must be geting sleepy. Going off. Hope the XB idea could be of interest to someone planing to make a highaltitude glider.
[22:13] <Sbear> bye.
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[00:00] --- Sun Jun 24 2007