highaltitude.log.20100826

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[00:34] <Wild-Wing> hello
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[00:37] <SpeedEvil> hello
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[01:52] <juxta_> hi all, anybody still up?
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[04:38] <W0OTM> anyone around?
[04:51] <SpeedEvil> no
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[05:01] <natrium> SpeedEvil, are you being naughty again?
[05:02] <SpeedEvil> I'm sort-of-not around
[05:09] <W0OTM> I need help
[05:09] <W0OTM> I have a 1400G payload
[05:10] <W0OTM> will a 600g balloon lift it?
[05:10] <SpeedEvil> Have you seen the calculator?
[05:11] <SpeedEvil> As I understand it, yes, but the burst will be considerably under nominal, and you'll need more helium
[05:12] <W0OTM> can I tie 2 600g balloons together?
[05:12] <W0OTM> properly filled
[05:14] <W0OTM> is 2 600g balloons the same as 1 1200G?
[05:15] <natrium> CUSF has launched dual balloons
[05:16] <natrium> try getting a hold of edmoore
[05:20] <W0OTM> hmm
[05:23] <W0OTM> is this site accurate for Kaymount balloons?
[05:23] <W0OTM> http://ukhas.org.uk/guides:balloon_data
[05:23] <natrium> yes
[05:23] <W0OTM> ok
[05:23] <W0OTM> so help me understand how to read it
[05:23] <W0OTM> im new at this
[05:24] <W0OTM> 600g has a gross lift of 1720
[05:24] <W0OTM> I subtract payload + chute
[05:24] <W0OTM> ~1500g
[05:24] <natrium> W0OTM, it's easier to use http://www.srcf.ucam.org/~cuspaceflight/calc/
[05:25] <W0OTM> ok, what do I put in for Target Ascent Rate?
[05:25] <W0OTM> 1?
[05:25] <natrium> 5 m/s is good
[05:25] <natrium> and delete target burst altitude
[05:25] <W0OTM> with a 600g balloon
[05:25] <W0OTM> and 1500g payload
[05:25] <natrium> yeah
[05:26] <W0OTM> Burst Altitude: 24950 m
[05:26] <natrium> i am getting Burst Altitude: 24950 m
[05:26] <W0OTM> Time to Burst: 75 min
[05:26] <natrium> you can go for slower ascent rate (if you can afford it)
[05:26] <natrium> and then it will go higher
[05:26] <W0OTM> what do you mean afford it?
[05:26] <natrium> well, it will travel further (depending on winds)
[05:26] <W0OTM> oh, ok
[05:26] <natrium> if you have enough land, that's fine :)
[05:26] <W0OTM> hold on
[05:27] <natrium> use the predictor to check where it will go http://www.habhub.org/predict/
[05:27] <W0OTM> http://www.habhub.org/predict/#!/uuid=d8ad7d7d28d09f1e7f123e818c9b71a39c4740a1
[05:27] <natrium> oh, you already go it, neat :)
[05:28] <W0OTM> if I use less helium, ill get a lower ascent rate
[05:28] <W0OTM> will I also go higher?
[05:28] <natrium> yep
[05:28] <W0OTM> so 600g WILL lift 1500g
[05:28] <natrium> indeed
[05:28] <W0OTM> is that because is less than the gross lift of 1720?
[05:29] <W0OTM> 600g will NEVER lift more then 1720g?
[05:30] <natrium> no, it can
[05:31] <natrium> burst diameter is ~602 cm for that balloon
[05:31] <W0OTM> ok, so as long as I am less than 1720, my balloon will go up
[05:31] <W0OTM> :)
[05:31] <natrium> so you could calculate how much lift that would get you at sea level
[05:31] <natrium> of course it will burst very quickly if you fill it that much :)
[05:32] <W0OTM> ok, so I shouldn't freak out that I have 1500g payload
[05:32] <natrium> nope
[05:32] <natrium> you could even launch 2kg no problem
[05:33] <W0OTM> with 600g balloon?
[05:33] <W0OTM> thats more than 1720 though
[05:33] <natrium> burst altitude would be 25441 m with ascent rate of 4.2m/s
[05:33] <natrium> W0OTM, that's the "recommended" gross lift
[05:34] <W0OTM> ahh, ok
[05:34] <natrium> just use the calculator to see what you get
[05:34] <natrium> there's also http://ukhas.org.uk/_media/guides:burst1a.xls?id=guides%3Aballoon_data&cache=cache
[05:34] <natrium> an excel table, that you could use
[05:34] <natrium> it will show gross lift, etc
[05:34] <W0OTM> I saw that
[05:34] <natrium> if you are interested
[05:35] <W0OTM> so I put in 4000g
[05:35] <natrium> kk
[05:35] <W0OTM> Burst Altitude: 22542 m
[05:35] <W0OTM> Ascent Rate: 3.04 m/s
[05:35] <natrium> yep, slow ascent rate
[05:35] <W0OTM> Burst Altitude: 20504 m
[05:35] <W0OTM> Ascent Rate: 5.38 m/s
[05:37] <W0OTM> I think I get it now
[05:37] <W0OTM> thank you
[05:37] <natrium> np
[05:38] <W0OTM> so when I fill this balloon, its should really pull
[05:38] <W0OTM> its not like a hand full of party balloons
[05:38] <natrium> see the "Neck Lift" field?
[05:38] <natrium> that's how much it should pull
[05:38] <natrium> you can use a scale
[05:39] <natrium> or a bag filled with ballast to test the pull while filling
[05:39] <W0OTM> ahh
[05:40] <W0OTM> ok
[05:40] <W0OTM> Neck Lift: 1986 g
[05:40] <W0OTM> so I need to put 1986b of weight when im filling
[05:40] <natrium> yep
[05:41] <W0OTM> when it just starts to lift 1986, I will get the calculated ascent rate
[05:41] <W0OTM> ?
[05:41] <natrium> exactly
[05:41] <W0OTM> ok
[05:41] <W0OTM> I get it
[05:41] <natrium> just be careful if it's windy
[05:41] <natrium> balloon tends to act like a kite
[05:44] <W0OTM> what alt does the sky turn black>
[05:44] <W0OTM> '
[05:45] <SpeedEvil> 0m
[05:45] <SpeedEvil> at night
[05:45] <natrium> lolol
[05:45] <W0OTM> you know what I mean
[05:45] <W0OTM> :)
[05:45] <natrium> W0OTM, 20km or so
[05:45] <W0OTM> ok, so ill get some nice photos at 27608m
[05:46] <natrium> yeah, you'll have a blast :)
[05:46] <W0OTM> have you seen my ballon site?
[05:46] <natrium> nope, link?
[05:46] <W0OTM> http://www.w0otm.com/iHAB
[05:47] <W0OTM> I got the 20M qrp xmtr done today
[05:47] <W0OTM> I need to post some new photos of the paayload
[05:48] <natrium> cool, looks good
[05:48] <natrium> when are you planning to launch?
[05:48] <W0OTM> sat
[05:48] <W0OTM> 8/28
[05:49] <natrium> neat, what time?
[05:49] <natrium> i will try to follow it :)
[05:49] <W0OTM> 1500z
[05:49] <W0OTM> list on 14.066.7
[05:49] <natrium> nice camera, should get good quality pics
[05:50] <natrium> are you using energizer lithiums?
[05:50] <W0OTM> yes
[05:51] <W0OTM> im also using 10hr hand warmers
[05:51] <W0OTM> for extra heat
[05:51] <natrium> good
[05:51] <natrium> ah, interesting
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[09:18] <juxta> W0OTM, are you still about?
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[10:09] <jonsowman> morning all
[10:09] <juxta> hey jonsowman
[10:09] <jonsowman> hows things?
[10:12] <juxta> good good
[10:12] <juxta> getting ready to fly that repeater sat :)
[10:16] <jonsowman> :D
[10:16] <juxta> hopefully the weather is a little nicer than tuesday ;p
[10:17] <juxta> should be launch on sun too
[10:19] <jonsowman> excellent
[10:19] <jonsowman> good stuff
[10:19] <jonsowman> :)
[10:19] <fsphil> three in a week, that's got to be a record :)
[10:20] <jonsowman> that is pretty good going hehe
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[12:48] <Upu> Dunno if anyones noticed this : http://www.theregister.co.uk/2010/05/21/paris_radio_kit/
[12:50] <Upu> UK launch on Sunday ?
[13:01] <fsphil> what exactly are they trying to do?
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[13:06] <Randomskk> launch a paper plane from a hab iirc
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[13:10] <SpeedEvil> they should get with laurenceb, and get it guided.
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[13:20] <juxta> ping Darkside
[13:28] <Upu> so this possible launch on Sunday is it a UK one ?
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[13:30] <juxta> Upu, which one?
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[13:30] <juxta> the one I'm doing?
[13:31] <Upu> if it's on Sunday yes
[13:31] <Upu> [10:17] <juxta> should be launch on sun too
[13:31] <juxta> ah - yeah
[13:31] <juxta> I'm in Australia :)
[13:32] <Upu> ah yeah range might be an issue on that one at 10mW :)
[13:32] <Upu> ok :)
[13:32] <Upu> right best go do some work
[13:32] <juxta> I have 25mW!
[13:32] <juxta> ;p
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[13:45] <SpeedEvil> moonbounce-HAB
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[13:55] <fsphil> now that would be quite the achievement
[13:58] <Hualon> have any of you ever flown HD video cameras? Any tips to share or suggested equipment?
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[14:07] <fsphil> I'm thinking about it, if that counts? :)
[14:07] <SpeedEvil> Someone did, yes.
[14:07] <SpeedEvil> For low definitions of HD video camera
[14:08] <SpeedEvil> The ones you can get on a keychain for a fiver
[14:08] <fsphil> ooh, stilldavid flew the hd hero on his
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[14:29] <Hualon> fsphil: I was planning to buy an HD Hero & shoot 720p 60fps for some nice slow-mo and tons of stills
[14:29] <Randomskk> why not get a proper video camera?
[14:30] <Randomskk> also: slow mo is going to be really, really boring for most of it, but super exciting at burst if it's watching the balloon
[14:30] <fsphil> if you played it back at 60fps, makes for very smooth video
[14:32] <Randomskk> I guess that is true
[14:33] <fsphil> I'd love for someone to make a 100fps camera
[14:35] <rharrison> fsphil, Casio EX-F1 my friend
[14:35] <m1x10> hello
[14:35] <rharrison> I'm launching a EOS 50D soon witha widangle lense on it
[14:35] <Randomskk> oh nice
[14:35] <Randomskk> 50D?
[14:36] <fsphil> very nice
[14:36] <Randomskk> seems like a 450D would do just as well for a fraction of the price
[14:36] <Randomskk> I wish I had a 50D :P
[14:36] <Randomskk> let alone to send up
[14:36] <Randomskk> (that said I am tempted by the prospect of a 1000D for a night launch, with a very fast lens)
[14:36] <Randomskk> remote triggering isn't hard, they have actual shutter inputs
[14:36] <Randomskk> and 'manual' mode and sleep properly
[14:37] <Randomskk> no need for CHDK because they are awesome cameras
[14:37] <Randomskk> 1000D is about £300 though
[14:40] <fsphil> could it make usable night shots?
[14:40] <Randomskk> I think so
[14:40] <Randomskk> the 50D would be even nicer
[14:40] <Randomskk> but is a lot more expensive
[14:40] <Randomskk> once I get paid and if I work for a few more weeks I could afford a 1000D to send up and not be the end of the world if I didnt' find it
[14:40] <Randomskk> but I can't afford a 50D for personal use, let along to send up
[14:40] <Randomskk> 1000D with a very fast lens like a 28mm/2.8 would be sweet though
[14:40] <Randomskk> 28/2.8 is quite cheap, too
[14:40] <Randomskk> still like three digits though
[14:41] <Randomskk> lenses are costly
[14:41] <Randomskk> but, f/2.8 and ISO1600 and the 1000D has much better noise perf than any point and shoot
[14:41] <fsphil> yea my big lens for the 350D was almost the price of the camera
[14:41] <Randomskk> even if it's worse than a 500D or a 50D
[14:41] <Randomskk> "almost"?
[14:41] <Randomskk> my lenses are pretty much all more expensive than the body
[14:42] <fsphil> at that point I'd be afraid to pick it up, or take it outdoors :)
[14:42] <Randomskk> :P
[14:42] <Randomskk> I'm certainly afraid to send it on a balloon
[14:43] <Randomskk> but a 1000D with a 28mm and f/2.8 lens could get some nice photos I reckon
[14:43] <Randomskk> and you'd get decent shutter times
[14:43] <Randomskk> plus as I said you put the camera into manual mode, set it however you want
[14:43] <fsphil> in saying that, I had the 350D attached to a 9.25" telescope once -- probably the biggest lens I've ever used :)
[14:43] <Randomskk> trigger it via a 3.5mm stereo jack cable, they all have shutter inputs
[14:43] <Randomskk> haha sweet
[14:43] <fsphil> yes shutter is great
[14:48] <Hualon> I'd rent the lens and body if I were doing that... but get the insurance!
[14:49] <Randomskk> hehe yes true
[14:52] <fsphil> "Sorry, I it's in the north sea somewhere... "
[14:53] <Randomskk> heck
[14:53] <Randomskk> "sorry, it's in the north sea at latitude xx.xxxx and longitude yy.yyyyy" :P
[14:54] <russss> heh
[14:55] <russss> the UKHAS balloon failure rate must be pretty low these days
[14:55] <russss> most of the losses have been expected
[14:57] <Hualon> haha
[14:58] <Hualon> Randomskk: what don't you like about the HD Hero? I'm not crazy about the fisheye lens look, myself.
[14:59] <fsphil> rharrison, that EX-F1 is an odd camera - like the high-speed mode though
[15:00] <rharrison> The CUSF boys have had a good play with it
[15:01] <rharrison> fsphil, check out the wmv's in here http://www.robertharrison.org/images/cutdown/
[15:03] <Hualon> rharrison: were these shot with the EX-F1?
[15:03] <rharrison> Yep
[15:03] <fsphil> does it produce wmv files, or was that exported from an app?
[15:03] <rharrison> Dubious MS CRAP
[15:03] <rharrison> iirc avi
[15:04] <fsphil> ah, not just as bad as wmv
[15:04] <rharrison> If you fram stop the fast one you can see the black powder slowy ignighting
[15:04] <Hualon> hehe... ka... ka... ka... BOOOOOOM
[15:05] <LA3QMA> any plans for a balloon release this weekend where it's going to the north sea?
[15:07] <LA3QMA> going to install a 23cm beacon beaming south either saturday or sunday so then i can monitor for weak signals :o)
[15:07] <fsphil> I was suppose to launch this weekend, caa didn't process the request in time :-(
[15:07] <LA3QMA> ahh ok
[15:08] <fsphil> and I'll be using 70cm
[15:08] <LA3QMA> i have a 70cm beam ready at the place :o)
[15:08] <fsphil> nice
[15:09] <LA3QMA> probably better signal2noice ratio on 70cm compared to 2m
[15:09] <fsphil> yep
[15:09] <fsphil> I was looking at 23cm ATV stuff earlier today -- got an old analogue satellite receiver that might do
[15:10] <LA3QMA> the 23cm beacon should reach shetland quite easy
[15:11] <LA3QMA> 5W FM to operate a repeater in shetland :o) when the propagation is ok
[15:11] <LA3QMA> 25W on regular basis
[15:12] <fsphil> I didn't think there would be that much propagation at 23cm
[15:12] <LA3QMA> rainscatter
[15:12] <LA3QMA> :o)
[15:12] <fsphil> ah yes
[15:12] <fsphil> lots of that here :)
[15:13] <fsphil> I noticed that when I first got my 2.4ghz vertical up -- I got a much better signal in the house when it was raining
[15:13] <LA3QMA> jupz. have a 3cm beacon ready but somethging wrong with the oscilator
[15:13] <LA3QMA> have an 8W PA for it too :o)
[15:14] <LA3QMA> not very common in this arera due to the topografy. but people on the other side of the lake could use these beacons :o)
[15:14] <LA3QMA> BBL food time
[15:15] <Randomskk> 2.4ghz vertical?
[15:18] <fsphil> http://www.sanslogic.co.uk/images/2.4ghz_omni.jpeg
[15:18] <fsphil> put it up about 10 years ago, used for a small town-wide network
[15:18] <Randomskk> oh sweet
[15:18] <Randomskk> wifi or..?
[15:18] <fsphil> yea, 802.11
[15:18] <Randomskk> cool
[15:19] <fsphil> also hacked an sma socket onto one of those little video senders, got some pretty good range with that
[15:22] <juxta> rharrison, I really wish we could get igniters here :(
[15:23] <rharrison> juxta, hehe they are good fun
[15:23] <juxta> only thing we can get is electric matches
[15:23] <juxta> but they need air
[15:23] <rharrison> So long as you keep your fingers out of the way
[15:24] <rharrison> Do they? These are also called emataches
[15:24] <Randomskk> didn't think ematches needed air
[15:24] <Randomskk> certainly those are all we use
[15:25] <Randomskk> and we use them embedded in black powder inside epoxy blocks
[15:25] <Randomskk> not much air there
[15:25] <juxta> hmm
[15:25] <juxta> are they just the resistive heat things?
[15:27] <juxta> the ones i'm thinking of are a resistive heat wire with some sulphor & phosphorus etc I think
[15:28] <Randomskk> yes I believe that's all these are
[15:28] <Randomskk> the things used to light up estes model rockets
[15:29] <juxta> hm - black powder and the like is pretty tricky to get here - but I think you can actually get small rocket motors without a permit
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[15:30] <juxta> I'll have to look into it a bit further
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[15:30] <rharrison> http://www.electricmatch.com/product_uk.html#top
[15:30] <rharrison> These are waht I uses
[15:31] <LA3QMA> back
[15:33] <juxta> cheers Rob
[15:33] <juxta> do you use powder too?
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[15:36] <juxta> hmm, seems I can buy smallish rocket motors one state over from me
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[16:08] <timbobel> hi
[16:19] <juxta> hey timbobel
[16:23] <m1x10> hello
[16:24] <m1x10> timbobel, I met a holland couple on the camping i go for holidays
[16:24] <m1x10> :)
[16:24] <m1x10> they camp there every year for 1 month:)
[16:24] <m1x10> that guy had a small boat and i was on it. and he came to me to tell me to go down. haha.
[16:25] <m1x10> there very good ppl
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[16:55] <timbobel> jeez juxta nice
[16:55] <timbobel> i was wondering when there would be launches
[16:56] <timbobel> juxta: are you serious?! the prediction and result are the same
[16:58] <timbobel> juxta: dont you need a licence from some institution
[16:59] <timbobel> so, juxta: do you love the FSA03 too?
[17:00] <m1x10> !zeus
[17:00] <m1x10> juxta is not here
[17:00] <timbobel> what happened to the camera?
[17:00] <timbobel> ah crap
[17:01] <timbobel> ive bought the lassen IQ
[17:02] <m1x10> timbobel, I wrote something to u above !
[17:03] <timbobel> yeah i know dutch people are everywhere
[17:03] <timbobel> they spend too much money and time on vacations,
[17:05] <m1x10> :)
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[17:44] <jshriver> :)
[18:27] <W0OTM> howdy
[18:28] <W0OTM> I have some questions about using 2 balloons
[18:29] <W0OTM> how does tieing 2 600g balloons differ from a single 1200g
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[18:43] <m1x10> http://www.nasa.gov/333091main_NASA_News_Audio_Windows.asx
[18:43] <m1x10> http://www.nasa.gov/news/media/newsaudio/index.html
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[19:43] <jshriver> good question WOOTM, unfortunately I don't have the answer. Hopefully one of the veterans HAB persons here will chime in.
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[20:01] <timbobel> who cares about the carrier shift amount
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[20:02] <timbobel> with the SMD resistors (there arent a lot of different ohmages) i need to revert to 350hz, is that ok?
[20:17] <timbobel> ,...
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[21:05] <timbobel> gah
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[21:05] <Laurenceb> hi
[21:05] <timbobel> nooones said a thing in over an hour
[21:05] <timbobel> im out
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[21:06] <Laurenceb> i did :(
[21:06] <Laurenceb> oh well im crazy anyway
[21:07] <jshriver> by chance has there ever been an attempt at long duration HABs? some way to get a payload to a certain altitude not even super high, but aim for duration over height.
[21:08] <russss> yep
[21:08] <russss> that's what jcoxon is working on
[21:08] <jshriver> at least amateur. Read about one NASA did over one of the poles
[21:08] <jshriver> nifty
[21:08] <russss> http://www.pegasushabproject.org.uk/wiki/doku.php/missions:ballasthalo
[21:08] <jshriver> bbiab
[21:08] <Laurenceb> the MIR work by CNES is worth a read
[21:08] <Laurenceb> hard to scale down tho
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[21:27] <Laurenceb> anyone used numpy?
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[22:22] <MrCraig> hello all - I'm just here for a short while to introduce myself. A newcommer to H.A. ballooning I didn't know about this channel.
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[22:24] <russss> hi MrCraig
[22:24] <MrCraig> :-) hi - Is anyone in here working on a H.A glider project?
[22:25] <Randomskk> a few people have plans and thoughts
[22:26] <Randomskk> and prototypes
[22:26] <Randomskk> but no launches
[22:26] <MrCraig> I see, thats about how much I have "thoughts" - it seems like CAA aproval might be more tricky
[22:26] <Randomskk> quite
[22:27] <Randomskk> I believe the understanding some people came to was that if it was basically a "parachute" that happened to modify its aerofoils to control flight, it'd still count as a payload descending by parachute from a balloon
[22:27] <Randomskk> and thus be legit
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[22:30] <MrCraig> I see :-/ perhaps if I want to attempt a glider flight at some point I'll look to lauch sights abroad where regulation might not be so strict on that point.
[22:31] <Randomskk> or in international waters
[22:31] <MrCraig> that's a good point, I hadn't considered that :)
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[22:40] <russss> Laurenceb: I use numpy a bit, btw
[22:41] <russss> not generally for hardcore maths though
[22:41] <Laurenceb> i did a launch
[22:41] <Laurenceb> yes
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[22:41] <Laurenceb> MrCraig: ive launched two rogallo wings from 12Km
[22:41] <Randomskk> ! oh, cool.
[22:41] <MrCraig> Can anyone give me information on the suitability / unsuitability of these radio modules? http://www.ok1mjo.com/all/conel/Maxon_ds-dm200-44.pdf I own three of these already, they weigh in a little heavy at just over three quaters of a pound
[22:41] <Laurenceb> annoyingly there was some issues on both flights
[22:41] <Randomskk> I didn't realise
[22:41] <Laurenceb> yes, last year
[22:42] <MrCraig> Cool Laurenceb :-)
[22:42] <Laurenceb> second one i demonstrated stable flight
[22:42] <Laurenceb> and some control
[22:42] <Randomskk> MrCraig: 0.1W would be illegal to broadcast with, on 434 airborne anyway
[22:42] <Laurenceb> but a kont came undone and most of the time it was stuck in a slight turn
[22:42] <Randomskk> and they're friggin massive and heavy
[22:42] <Laurenceb> *knot
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[22:42] <Laurenceb> always the simple things :P
[22:42] <Randomskk> Laurenceb: D: that's annoying
[22:43] <Upu> what's that RF connector on Robs board called (http://www.robertharrison.org/images/icarus2/IcarusII-Filled.JPG) is it a MCX one ?
[22:43] <Randomskk> pretty promising though
[22:43] <Upu> seems to have a screw on it which I'd prefer
[22:43] <Upu> but don't know what type it is
[22:43] <Laurenceb> i spoke to some yatch racing guys later and they were like what do you expect to happen
[22:43] <Randomskk> MrCraig: we use NTX-2s from radiometrix a lot
[22:43] <MrCraig> You recieve data through a radio tied into a soundcard right?
[22:43] <Laurenceb> apparently nylon line will untie practically any knot after enough vibration
[22:44] <Upu> SMA ?
[22:44] <Laurenceb> yes we use soundcard
[22:44] <Laurenceb> i still have my rogallo - its been upgraded and is ready to fly
[22:44] <DanielRichman> Upu: I think that is an SMA
[22:44] <DanielRichman> I am not 100% sure
[22:44] <Laurenceb> but working on other stuff atm
[22:44] <Upu> I think it is now I look at it
[22:44] <Upu> thanks
[22:44] <natrium42> RTF
[22:45] <Laurenceb> also i was going to upgrade the gps to ublox5 or 6
[22:45] <Laurenceb> before another launch
[22:45] <Randomskk> I like the nice thick power traces on that
[22:45] <MrCraig> ok - that could work - I have an old asus eeepc which I loaded windows and bolted a touch screen - planning to bed that in the dash of my car and then I have some dodgy old "spinney tronic" transciever I could tie into it.
[22:45] <Randomskk> so long as it receives SSB
[22:45] <Laurenceb> MrCraig - look up rogallo wing
[22:46] <MrCraig> Laurenceb, I did :)
[22:46] <Laurenceb> its the way to do it
[22:47] <Laurenceb> i used a "diy winch servo" and CofG shift
[22:47] <Laurenceb> as in a high end digital servo with a winch drum
[22:47] <MrCraig> It looks promising - my idea is to attach a micro-controller and a single servo to control the wings - tie that into the gps and try to have it self guide back down (trying to safeguard the investments of course)
[22:47] <Laurenceb> then just a single gyro - mlx90609
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[22:47] <Laurenceb> and 2dof kalman filter with the gps and forcast wind data
[22:47] <MrCraig> I wass thinking of rigid wings though - I guess rogallo wings are a good way to skirt the regulations
[22:48] <Laurenceb> yes, thats kind of the point
[22:48] <Laurenceb> it also doesnt have a very good glide ratio, so if theres a bug its not going to land in france
[22:48] <Laurenceb> 4:1 for my wing
[22:48] <Laurenceb> i just used an atmega168
[22:49] <Laurenceb> kalman filter ran in just 800us using single precision float for everything :P
[22:49] <Laurenceb> avr doesnt suck at floating point
[22:50] <MrCraig> hmm - I have a pic series programmer and a few controllers, I really should look at updating my tech :)
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[22:52] <Laurenceb> http://ukhas.org.uk/_media/projects:ukhas_glider_project:pict7921.jpg
[22:52] <Laurenceb> ^ prototype
[22:52] <russss> AVR is the way forward
[22:52] <Laurenceb> sorry no photos of the flight version
[22:52] <Laurenceb> theres a video of launch
[22:52] <Laurenceb> stm32 is the way forward :P
[22:52] <Randomskk> stm32s are fantastic
[22:53] <Randomskk> I want them to get just a pound or two cheaper on the low end
[22:53] <MrCraig> nice - looks too cool :-)
[22:53] <Laurenceb> powered was a bad idea
[22:53] <MrCraig> There's a lot of electronics in the base - More than I expected to see
[22:54] <Laurenceb> it needs a variable AOA wing
[22:54] <Laurenceb> theres a thread or two on that issue on rcgroups
[22:54] <Laurenceb> lots of powered rogallo stuff
[22:55] <MrCraig> Another reason why I really wanted rigid wing - because you can simply rotate them around the fusilage with a single small servo, or even manipulate flaps the same
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[22:56] <Laurenceb> you can with a rogallo wing
[22:56] <Laurenceb> thats how you steer
[22:56] <Laurenceb> its framed and there are two bearings where the spars down to the tronics connect
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[22:57] <MrCraig> I need to learn a whole lot about a whole lot
[22:57] <MrCraig> wow
[22:57] <MrCraig> Looks like I'm going to be buying all components from more modern tech too rather than raiding my old stash of stuff
[23:00] <Laurenceb> http://ukhas.org.uk/code:parafoil_v2?s=rogallo
[23:00] <Laurenceb> feel free to reuse code tho :P
[23:00] <MrCraig> cool thanks :-)
[23:01] <MrCraig> the code is actually the bit I should be best at to be fair but really appreciate samples / examples / reusables
[23:02] <Laurenceb> woops
[23:02] <Laurenceb> http://ukhas.org.uk/code:parafoil_tsip
[23:02] <Laurenceb> thats the flight version code
[23:02] <Laurenceb> that actually flew and seemed to work pretty much fine apart from the knot issue
[23:03] <Laurenceb> tho whole project is a bit complex, its explained here -> http://ukhas.org.uk/code:parafoil_main
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[23:03] <MrCraig> I'll study it some
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[23:05] <natrium42> kalman'd
[23:06] <Laurenceb> using ublox5 would just require swapping tsip for ubx for the gps interface - code for that was finished -> http://ukhas.org.uk/code:interrupt_driven_ubx
[23:06] <Laurenceb> but i havent worked on this for about 18 months
[23:08] <MrCraig> ok - how can I determine if this radio is suitable and supports SSB? I presume I should see a suitably labeled switch or something? It's basically a rebranded old Amstrad 901
[23:12] <MrCraig> from what I've read I guess it doesn't :)
[23:13] <MrCraig> ok - I'm off to bed. It was nice to meet you all, I'll stop back at a less uncomfortable hour next time.
[23:14] <Laurenceb> cya
[23:14] <Laurenceb> good luck
[23:14] <MrCraig> cya - thanks for the share... I hope I can be as useful as I learn about all of this stuff.
[23:15] Action: jcoxon is trying to debug his virgin media cable modem
[23:15] Action: MrCraig is ditching virgin media at last, been with them since they were NTL - I move to a new flat in just over a week and have the other evil isp.... BT :)
[23:15] <MrCraig> night \\//
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[23:16] <jcoxon> what makes me smile is that it seems that my signal is too strong
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