highaltitude.log.20080714

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[09:58] <edmoore> hi Laurenceb
[09:59] <edmoore> How's tricks?
[10:01] <Laurenceb> hi there
[10:01] <Laurenceb> not so bad, very busy here
[10:01] <edmoore> renovation?
[10:01] <Laurenceb> yep
[10:02] <edmoore> cool
[10:02] <Laurenceb> done a bit of work on a flight computer for a parafoil
[10:03] <Laurenceb> smd on veroboard, I've got Rs232, V regs, SPI, back up battery for the lassen iq, pwm in and out, and cutdown
[10:04] <Laurenceb> used a SOT-23 logic level mosfet soldered between two tracks for the cutdown
[10:05] <Laurenceb> at work?
[10:05] <edmoore> yep
[10:05] <edmoore> sorry keep talking
[10:06] <edmoore> actually, must reset
[10:06] <edmoore> back in 4 mins, then ill talk
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[10:14] <Laurenceb> yo
[10:14] <Laurenceb> say have you got any mlx90609 gyros from sparkfun?
[10:15] <Laurenceb> I was just wondering if you'd got them working
[10:17] <edmoore> yes and no
[10:17] <edmoore> respecitively
[10:17] <edmoore> imu went on the bacj burner for the badger
[10:17] <Laurenceb> ok
[10:17] <edmoore> but I'm going to have to build it in the next couple of weeks, so I'll let you know
[10:18] <Laurenceb> I'm thinking of buying some more from robosavvy
[10:18] <edmoore> we might use an IDG300 in the next revision of badger
[10:18] <Laurenceb> ok
[10:18] <edmoore> just for space saving.
[10:18] <Laurenceb> dont want to cannabilise the rogallo
[10:19] <edmoore> Would like to make it able to run a parafoil at any rate
[10:19] <edmoore> yeah that's fair enough
[10:19] <Laurenceb> I'll put it in my museum :P
[10:19] <edmoore> so tell me about new flight computer - smd on veroboard sounds like the work of a man with a steadier hand than me
[10:19] <Laurenceb> hehe all the components are at weird angles
[10:20] <Laurenceb> I'm not superhuman
[10:20] <edmoore> have you got to the god-like levels of that chinese guy?
[10:20] <Laurenceb> atm I'm not sure how to power the servo
[10:20] <edmoore> the one who did the laser projector?
[10:21] <edmoore> what do you mean?
[10:21] <Laurenceb> give it time give it time :-P
[10:21] <Laurenceb> so I'm thinking of maybe going for a mini rogallo
[10:21] <Laurenceb> not a parafoil now
[10:21] <Laurenceb> so it would work with a micro servo
[10:21] <Laurenceb> the main power will be 4xAA
[10:22] <Laurenceb> what do you think to running the servo off that?
[10:23] <Laurenceb> I was going to experiment with a rudder as opposed to c of g shift - that means a much less powerful servo can be used
[10:23] <edmoore> hrm...
[10:23] <edmoore> it might be a bit tight
[10:23] <edmoore> the mini servos can draw quite a bit of current
[10:23] <edmoore> in the past I have run things like that off a seperate set of batts
[10:24] <Laurenceb> me too
[10:24] <edmoore> so even if locomotion goes down, you still have plenty of juice left to run the computer
[10:24] <edmoore> the servo might bind up and start drawings amps - it's a harsh environment as I don't need to tell you
[10:25] <edmoore> You could also opto-isolate the input to the servo from the flight computer - that's really help your emi
[10:25] <Laurenceb> yes, did that on the rogallo
[10:25] <edmoore> Probably best to go for that again then.
[10:26] <edmoore> I couple of A123s or something might do the trick
[10:26] <Laurenceb> hehe
[10:26] <Laurenceb> I'll just use lithium photos
[10:26] <edmoore> pricy!
[10:26] <Laurenceb> not compared to helium
[10:26] <Laurenceb> use alkaline for most of the testing
[10:27] <Laurenceb> this is interesting --> http://www.rcgroups.com/forums/showthread.php?t=368337
[10:27] <edmoore> hmm very nice
[10:28] <Laurenceb> the pivoting wing is a good idea
[10:28] <edmoore> yes very
[10:29] <Laurenceb> solves the problems I had with trim
[10:29] <edmoore> what do you reckon on firing the payloads down with rockets after cutdown to accelerate them?
[10:30] <edmoore> I'm quite keen on the idea, if it can be made stable
[10:30] <Laurenceb> haha
[10:30] <edmoore> I want to get some more realistic conditions to test martlets recovery system
[10:30] <Laurenceb> ah
[10:30] <Laurenceb> ok, thought it was to miss the coastline
[10:30] <edmoore> lol, no
[10:31] <Laurenceb> sounds like an interesting plan, just dont kill anyone
[10:31] <edmoore> most of the CUSF ballooning for the next while will be for testing rocket things rather than ballooning for its own sake
[10:31] <edmoore> annoyingly
[10:31] <Laurenceb> have you seen that guys onboard video?
[10:31] <edmoore> oh it'd still reach equilibrium just the same by the time it hits the ground
[10:31] <edmoore> no - on forst page?
[10:31] <Laurenceb> http://www.barstoolap.com/Roger/Kite-Plane/Kite-e%20Twist.wmv
[10:33] <edmoore> downloading...
[10:34] <Laurenceb> the resolution is pretty huge
[10:38] <Laurenceb> should I put a 5V reg between the servo and batteries?
[10:39] <edmoore> no
[10:39] <edmoore> although micro servos are less tolerant to over voltage
[10:39] <edmoore> but 6V should be fine
[10:39] <Laurenceb> lithiums are a bit over- up to 7v
[10:40] <edmoore> well if it's a 'small' rogallo, I'd still probably got for a standard servo
[10:40] <edmoore> a decent performance analogue one
[10:40] <Laurenceb> yeah
[10:40] <edmoore> digitals consume huge amounts of current, and you probably don't need their holding torque
[10:41] <edmoore> but it's still quite a lot of air surface the servo is hauling around
[10:41] <edmoore> but standard analogue servos are quite happy at 7+ V
[10:41] <Laurenceb> hmf I'll probably have to buy a servo as well then
[10:42] <Laurenceb> I only have 6,4,and 5 gram ones and some large acoms
[10:42] <edmoore> it's worth spending a bitto cash on a decent metal-geared one
[10:43] <Laurenceb> yeah
[10:43] <edmoore> or actually maybe not metal as it might not be so good at -60
[10:43] <edmoore> karbonite (or whatever their marketing people call it) might be a good bet
[10:43] <Laurenceb> right wassat?
[10:44] <edmoore> some kind of tough gear material that hitec use
[10:44] <edmoore> basically, get something more than nylon gears, and make sure it has ball beaings
[10:44] <edmoore> then you're all gravy
[10:44] <edmoore> it's worth the extra £10 on a project like this, I'd have thought
[10:45] <Laurenceb> yes
[10:45] <Laurenceb> any ideas where to buy servos?
[10:46] <Laurenceb> ooh rapid sell crimping tools
[10:48] <edmoore> all over the place
[10:48] <edmoore> I'd find one first then ask ebay
[10:48] <edmoore> and failing that, any number of the bagizillion online model shops
[10:49] <Laurenceb> k
[10:49] <Laurenceb> do you think rapid 22-0905 will take their crimps?
[10:50] <Laurenceb> sorry I'll get a line
[10:50] <Laurenceb> *link
[10:50] <edmoore> which crimps?
[10:50] <Laurenceb> 22-1096
[10:52] <edmoore> rapid doesn't seem to be loading for me
[10:52] <edmoore> ok got them
[10:52] <edmoore> the standart 0.1" molex crimps
[10:52] <Laurenceb> yes site is being slow
[10:53] <edmoore> what about them?
[10:53] <Laurenceb> will they fit 22-0905 do you think?
[10:55] <edmoore> loading....
[10:55] <Laurenceb> now all links point to the front page
[10:55] <edmoore> lol
[10:55] <Laurenceb> whats up with their site
[10:55] <edmoore> they're obviously having problems
[10:56] <edmoore> what's the product description?
[10:56] <Laurenceb> its a sil crimp housing
[10:57] <edmoore> made by?
[10:58] <edmoore> and pitch?
[10:58] <Laurenceb> argg I was just auto logged out
[10:58] <Laurenceb> pitch 0.1''
[10:59] <edmoore> they probably will work
[10:59] <edmoore> they're all pretty standard
[11:00] <Laurenceb> I'll get their pack of 500 crimps as well
[11:01] <Laurenceb> that should be enough
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[11:07] <Laurenceb> would you be worried about them being nickel plated, not gold?
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[11:13] <edmoore> fnoble: am here and asnwering you
[11:13] <edmoore> Laurenceb: no
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[11:38] <Laurenceb> edmoore: what do you think to this? http://cgi.ebay.co.uk/HITEC-HS-300BB-STANDARD-BALL-BEARING-SERVO-6V_W0QQitemZ120213733158QQcmdZViewItem?hash=item120213733158&_trksid=p3286.m14.l1318
[11:42] <edmoore> looks a bit wimpy - lemme have a look.
[11:42] <edmoore> I'd go for something nearer 6-10 kg/cm of torque
[11:45] <Laurenceb> well IMO your letting the servo dictate the size of the thing
[11:45] <Laurenceb> its only for driving a rudder
[11:48] <edmoore> oh ok
[11:48] <edmoore> maybe that's ok then
[11:49] <Laurenceb> well thats my plan atm
[11:49] <edmoore> bear in mind a meatier servo will use less current do do the same job as a smaller servo
[11:49] <Laurenceb> hmm good point
[11:50] <edmoore> as it'll be in a more effecient region of operation
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[12:15] <edmoore> fnoble: am back
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[16:04] <jcoxon> hey edmoore
[16:04] <edmoore> ello
[16:04] <edmoore> how's tricks?
[16:06] <jcoxon> not bad, just had an afternoon snooze :-p
[16:06] <edmoore> lol
[16:06] <jcoxon> oops was meant to be revising
[16:07] <edmoore> I am ok today - it must be the coffee
[16:07] <jcoxon> i'm having my caffinneeeeee dose now
[16:07] <edmoore> I'm mentally designing some funky zeit
[16:07] <edmoore> Have good a good balloon mission lined up to test it
[16:08] <jcoxon> zeit?
[16:09] <edmoore> sh!t
[16:09] <edmoore> it's a hybrid recovery system
[16:09] <edmoore> for when the rest of your team wont give you the weight budget to do it properly
[16:10] <jcoxon> go on...
[16:12] <edmoore> well it's a sort of large inflatable deploying structure that has good characteristics at high mach
[16:12] <edmoore> and adequate ones subsonic
[16:13] <jcoxon> cool
[16:13] <edmoore> but importantly it is useful in both regions, and we don't really have the weight budget for both a parachute and a *something else*
[16:14] <edmoore> I want to fire a balloon payload downwards with rockets to test it
[16:14] <edmoore> need to get the descent speed up quickly
[16:15] <jcoxon> that would be interesting, i guess safety wise it wouldn't matter as it'll reach the same speed eventually
[16:16] <jcoxon> (as long as they fire)
[16:16] <edmoore> oh yeah, it would only be to get from 30km to 28 (say) at a higher speed than usual
[16:16] <edmoore> it'd get back to usual speeds very quickly
[16:19] <jcoxon> just been looking at the xprize - appears there won't be a weekend event this year
[16:19] <edmoore> yes so i hear
[16:19] <edmoore> poo bum
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[16:30] <jcoxon> good news about my ground software, i can now grab the decoded data from truetty for my program and display it nicely
[16:30] <edmoore> launch countdown?
[16:31] <jcoxon> ?
[16:31] <jcoxon> my dashboard countdown says 28days
[16:32] <edmoore> when' that then?
[16:32] <jcoxon> 11th august
[16:32] <edmoore> second sunday of august?
[16:32] <jcoxon> yup
[16:33] <jcoxon> hmmm really it shouldbe the 9th
[16:33] <jcoxon> 25 days
[16:33] <edmoore> do you have a dashboard countdown timer?
[16:34] <jcoxon> yup
[16:35] <jcoxon> http://www.widgetop.com/downloads.html
[16:35] <edmoore> got it
[16:42] <jcoxon> i updated the wiki for planned launches
[16:42] <edmoore> coolio
[16:43] <jcoxon> i just put badger as badger
[16:46] <jcoxon> wasn't sure about what launches you wanted to do/reveal
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[17:03] <edmoore> jcoxon: sorry phone rang
[17:03] <edmoore> oh badger is totally open
[17:03] <edmoore> just not organised to know yet!
[17:03] <edmoore> we'll want to do a basic validation flight asap
[17:03] <edmoore> then another as soon as possible after once we've absorbed all the info we can
[17:04] <edmoore> likewise a review. then start flying parachutes with mortars
[17:04] <edmoore> and get them tested up with a couple of flights
[17:04] <edmoore> and then we have a baseline system (so the theory goes) and can start experimenting
[17:05] <edmoore> with things like the high speed burst detection, maybe harve, and some rocket stuff
[17:09] <jcoxon> hehe
[17:09] <jcoxon> not sure how to condense that down...
[17:09] <jcoxon> voila: http://wiki.ukhas.org.uk/payloads_waiting_to_be_launched
[17:09] <jcoxon> edmoore - did you say baseline system then experiement :-D
[17:09] <edmoore> we could submit badger as an atlas potential
[17:09] <edmoore> that would make a good test flight too
[17:09] <jcoxon> you are beginning to sound like me after a crap launch
[17:10] <edmoore> lol
[17:10] <edmoore> well we want something that we think we can rely on
[17:10] <jcoxon> yeah i just stuck atlas down
[17:10] <edmoore> whether or not we actually can is another batter, of course
[17:10] <jcoxon> coolio
[17:10] <jcoxon> well a goliath/badger flight would be cool
[17:11] <edmoore> yep, up for that
[17:11] <edmoore> can't wait to start doing badger v2 aswell
[17:11] <edmoore> that'll be fun
[17:12] <jcoxon> edmoore, shall we standardise a string for gps coordinates to be sent via gsm and radio
[17:12] <jcoxon> then we can use the same ground software for goliath and badger flights
[17:12] <edmoore> I don't object to a standard bit
[17:12] <edmoore> bit we'll want to send other stuff too
[17:12] <jcoxon> perhaps the first 5 things are the same
[17:12] <jcoxon> then the rest is mission dependent
[17:13] <jcoxon> so that i can parse the data nicely
[17:13] <edmoore> i agree a standard of some sort would be good just in the name of helping whatever parsing/tracking engine we end up with
[17:13] <jcoxon> yeah
[17:13] <edmoore> and maybe it could run landing prediction every iteration
[17:13] <edmoore> with Rob's code
[17:13] <jcoxon> whats rob's code in?
[17:13] <edmoore> which runs pretty quick
[17:14] <edmoore> C++
[17:14] <jcoxon> easy, on my mac it could run it off the command line inputin the data
[17:14] <edmoore> yup
[17:14] <jcoxon> all automated
[17:14] <jcoxon> howabout:
[17:15] <edmoore> or on a server somewhere
[17:15] <jcoxon> Callsign,time,lat,long,alt,other shit seperated by commas
[17:15] <edmoore> that sounds good
[17:15] <edmoore> just the basics
[17:15] <jcoxon> yeah
[17:15] <edmoore> decimal position?
[17:15] <jcoxon> for a first step
[17:15] <jcoxon> yeah
[17:16] <edmoore> sounds good
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[17:18] <edmoore> right, home time
[17:18] <edmoore> bbl
[17:18] <jcoxon> coolio, cya
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[17:33] <jcoxon> haha that was qick
[17:33] <jcoxon> quick*
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[19:35] <edmoore____> wow
[19:35] <edmoore____> this is a bit odd
[19:41] <akawaka> ?
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[00:00] --- Tue Jul 15 2008