highaltitude.log.20121220

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[00:03] <arko> haha
[00:04] Action: Maxell and costyn are getting closer and closer >:)
[00:07] <arko> "We will ship the item(s) to you as a gift to avoid the custom tax problem"
[00:07] <arko> lol
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[00:20] <Lunar_Lander> xD
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[07:40] <nosebleedkt> hi all
[07:40] <eroomde> morning
[07:40] <eroomde> arko: yo
[07:41] <number10> morning
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[07:55] <arko> sup eroomde
[07:55] <arko> how are things
[07:56] <arko> just got back from picking up a friend from LAX
[07:56] <arko> ugg i hate LA traffic
[07:59] <eroomde> they're well
[07:59] <eroomde> had our christmas party last night
[07:59] <eroomde> not in a big hurry to have breakfast
[08:00] <eroomde> that's my last commitment b4 christmas
[08:00] <eroomde> which i can now think about
[08:01] <arko> nice
[08:02] <eroomde> so what up with chute testing?
[08:02] <eroomde> i have missed it the last couple of times with being busy
[08:03] <SpeedEvil> eroomde: :-)
[08:03] <SpeedEvil> who was showing pictures of himself throwing a parachute in the street at night with a go pro
[08:04] <eroomde> and then the police arrived, presumably
[08:04] <SpeedEvil> no
[08:04] <SpeedEvil> if my client had functioning search, I'd go back and look
[08:05] <arko> oh the chute test was just to see how well they deploy when tangled, the real tests haven't happened yet though
[08:05] <arko> mostly been camera tests
[08:05] <SpeedEvil> oh
[08:05] <SpeedEvil> :-)
[08:06] <arko> then when we have a base line of different deployments, we will think of solutions and test them
[08:06] <arko> police almost showed up
[08:06] <eroomde> so you want to actively deploy the chute?
[08:06] <arko> actually no
[08:07] <arko> it's pre deployed, but my fear is tangling when it initally drops
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[08:07] <arko> thus causing the parachute to open unevenly
[08:08] <eroomde> twood be annoying
[08:08] <eroomde> well, extending the mouth with webbing is a common trick
[08:09] <SP9UOB> Hi all
[08:09] <arko> that's one of the concepts :)
[08:09] <SP9UOB> someone can approve flight doc: b11e2e84203bacf9036919c58d705948 ?
[08:09] <arko> the other is a hoop
[08:09] <arko> know any others?
[08:09] <eroomde> a hoop?
[08:09] <eroomde> oh for the lines?
[08:09] <arko> yes
[08:09] <arko> going to try both and see what happens
[08:10] <eroomde> well, taschengurts encourage the mouth to open properly
[08:10] <eroomde> and not invert
[08:10] <eroomde> but that's more for controlling deployment charachteristics than anti-tangling
[08:10] <arko> ah
[08:10] <arko> yeah, it will be predeployed
[08:12] <eroomde> webbimg is usually the thing
[08:12] <eroomde> spring pilot chutes, used for skydiving and other things, are often completely webbing
[08:12] <eroomde> so they absolutely cannot tangle
[08:13] <eroomde> we used one to deploy the main on the mars-sim drop test vehicle
[08:13] <arko> oh!
[08:13] <arko> cool
[08:13] <arko> any good papers or documentation?
[08:13] <arko> recommendations
[08:14] <eroomde> http://eshop.marsjev.cz/editor/image/produkty2/obrazek_236.jpg
[08:14] <eroomde> you can see how it works from that hopefully
[08:15] <x-f> SP9UOB, better ask in #habhub
[08:15] <eroomde> aerocon selling some too
[08:15] <eroomde> http://aeroconsystems.com/cart/all-parachutes/60-inch-pilot-parachute-green/white/
[08:15] <eroomde> there's some treatment on them in Knacke
[08:16] <eroomde> i have a couple of copies and could bring one along next month, but i'm sure JPL has a few copies too :)
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[08:17] <eroomde> btw these things as designed like that are as stable as someone with bipolar disorder on a unicycle
[08:17] <eroomde> they're just designed to deploy and be draggy enough to pull out a main chute
[08:18] <eroomde> their oscillatory characteristics will be sucky
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[08:18] <eroomde> but perhaps fixable with some carefully applied porosity (about 20% by geometric canopy area)
[08:21] <arko> wow
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[08:23] <arko> I didn't think about those chutes, but I guess they wouldn't be so great
[08:23] <eroomde> i explained the spring bit here: http://youtu.be/sU6j49eCkF4?t=16m40s
[08:24] <eroomde> they could be made great with an xacto knife
[08:27] <arko> ohh
[08:28] <arko> so you just cut off the spring inside then ta da?
[08:28] <eroomde> well that aerocon one is without spring
[08:28] <eroomde> just a normal chute
[08:28] <eroomde> but it's the solid canopy that gives it the poor stability
[08:29] <eroomde> you want some porosity so that the higher pressure air in the canopy can move to the low pressure bit behind the canopy without spilling out of the edge of the mouth
[08:29] <eroomde> which is what applies big couples to the chute making it bounce around
[08:30] <arko> ah, got it
[08:32] <SpeedEvil> aside: it's amazing how much less a stretched bit of ground cover fabric flaps in the wind than tarp
[08:36] <SpeedEvil> aside2: it's way too windy and rainy for it to be fair that I have to go outside to the dentist.
[08:38] <fsphil> it's never fair to have to go to the dentist
[08:39] <eroomde> correct
[08:42] <number10> x-f: SP9UOB this would be an interesting flight http://habhub.org/predict/#!/uuid=8c57cbac965cd3ff88e7fca4476dd44dff800aec
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[08:42] <x-f> hah, it would indeed :))
[08:43] <number10> I have a pico ready - if I can get it to float this time
[08:43] <fsphil> I question that predictions accuracy :)
[08:43] <UpuWork> lol indeed
[08:44] <number10> well it is too far in advance I know - I have to trust the tools we have :)
[08:44] <x-f> a man can dream!
[08:44] <SP9UOB> i dont have permission yet :-( So maybe next week
[08:53] <gonzo___> I love some of the predictions for floats that go over the continent. At the mountains, the path does a complicated little dance
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[13:24] <WillDuckworth> is eroomde around? quick question: re. your rocket engine testing - what type of sensors are being used for chambre and fuel tank pressures & flow rates?
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[13:41] <NickB1> does anyone know what type of connector the ACC port is on the FT817?
[13:42] <mfa298> 8 pin mini din I think from looking at the back of my 817
[13:42] <mfa298> and the data port (where audio is) is a 6pin mini din (like the ones used for ps/2 keyboard/mice)
[13:43] <NickB1> yes that it :)
[13:43] <NickB1> thanks!
[13:44] <NickB1> gonne make a rigcat cable :)
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[14:47] <Laurenceb> any linux gurus here?
[14:48] <Laurenceb> ive got an issue with file permission
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[14:50] <costyn> Laurenceb: watsup?
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[14:52] <nick_> Laurenceb: what's the problem?
[14:52] <Laurenceb> thanks
[14:52] <Laurenceb> so i have a directory
[14:52] <Laurenceb> -rwxrw---- 1 <user> <user>
[14:52] <Laurenceb> im logged in as user
[14:52] <Laurenceb> yet im getting "cp: cannot create regular file"
[14:52] <Laurenceb> in there
[14:53] <costyn> but rwxrw indicates a file
[14:53] <costyn> there'd be a 'd' infront if it were a directory
[14:53] <Laurenceb> oh yeah
[14:53] <Laurenceb> ah i see
[14:53] <Laurenceb> directory is owned by root
[14:54] <nick_> root is a greedy bastard
[14:54] <costyn> Laurenceb: problem solved?
[14:55] <Laurenceb> yes thanks
[14:55] <Laurenceb> how do i give <user> ownership?
[14:55] <Laurenceb> chown ... ?
[14:55] <costyn> yup
[14:55] <costyn> chown <user> <file/dir>
[14:57] <Laurenceb> drwxr-xr-x 2 <user>root
[14:57] <Laurenceb> does that mean user can read/write?
[14:57] <costyn> no
[14:57] <costyn> oh wait
[14:57] <costyn> yes
[14:57] <costyn> owner user, group root
[14:58] <Laurenceb> ok
[14:58] <Laurenceb> seems to work now, thanks
[14:58] <costyn> nice
[14:59] <nick_> You can change the group with chown too
[14:59] <nick_> chown <user>:<group> <file>
[15:00] <Laurenceb> ok
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[17:03] <nigelvh> Morning
[17:04] <eroomde> Upu: https://www.dropbox.com/s/gg0e2g3v9lzf7k1/2012-12-20%2017.00.17.jpg
[17:04] <eroomde> thems has arrivled
[17:08] <nigelvh> Oh! These were the boards you were showing me!
[17:08] <nigelvh> Nice looking
[17:08] <eroomde> yeah they've come out quite nicely
[17:09] <eroomde> will be 2013 before they get populated sadly
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[17:09] <nigelvh> That is dissapointing
[17:09] <eroomde> so that was 10 of those boards which are 8cm x 10cm, and a stencil, and DHL shipping, for $90
[17:09] <nigelvh> That's a good price!
[17:09] <eroomde> yep
[17:10] <eroomde> #hackvana
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[17:13] <nick_> eroomde: where did you get them from, and how quickly?
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[17:17] <griffonbot> Received email: David Bowkis "[UKHAS] ANU project launch 26/12"
[17:18] <daveake> I ought to order some foil balloons
[17:19] <eroomde> nick_: #hackvana
[17:19] <eroomde> about 2 weeks but that was with a 5 day delay which i knew about
[17:19] <eroomde> normally quicker
[17:28] <arko> good morning
[17:29] <eroomde> good morning arko
[17:29] <arko> whasss up
[17:30] <arko> ok it's coffee time
[17:30] <arko> i'll be back in a bit
[17:33] <nick_> eroomde: they only do a quote to tell you the price?
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[17:44] <eroomde> nick_: yeah
[17:50] <griffonbot> Received email: navrac "[UKHAS] Re: ANU project launch 26/12"
[17:51] <eroomde> nick_: hop onto #hackvana and talk to Mitch (hacvana)
[17:53] <UPu2> they look nice eroomde
[17:53] <UPu2> in black too you tart
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[17:53] <eroomde> i like them in black
[17:53] <UPu2> you can't knock that price though
[17:53] <eroomde> you really can't
[17:54] <UPu2> prices for colours have gone up now
[17:54] Nick change: Upu -> UpuWork
[17:54] Nick change: UPu2 -> Upu
[17:55] <Upu> ignitortron :)
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[17:59] Nick change: 77CABYTRM -> Cadair
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[18:24] <Laurenceb> http://www.digikey.co.uk/product-detail/en/STM32F303CCT6/497-13318-ND/3660423
[18:24] <Laurenceb> awesomeness ^
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[18:44] <SpeedEvil> Laurenceb: why?
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[18:44] <Laurenceb> M4F in 48pin package
[18:44] <Laurenceb> fpu
[18:44] <SpeedEvil> ah
[18:45] <SpeedEvil> and I guess an easy package
[18:46] <nick_> 4 ADCs is nice
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[19:27] <arko> Digi-Key Obsolete Parts Notification emails are awesome
[19:27] <arko> nice of them to do that
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[20:11] <OZ1SKY_Brian> hi
[20:12] <Upu> evening Brian
[20:14] <NickB1> anyone tried this? http://www.rason.org/Projects/collant/collant.htm
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[20:14] <Upu> yes NickB1
[20:14] <Upu> I think I got it wrong
[20:14] <Upu> as it didn't work
[20:14] <Upu> evening jcoxon
[20:15] <OZ1SKY_Brian> Hi Upu, did you launch?, i see a parashute near you?
[20:15] <Upu> ah no testing this http://i.imgur.com/m9kMh.jpg
[20:15] <Upu> well power saving code on that
[20:16] <OZ1SKY_Brian> ahh ok nice unit
[20:16] <Upu> am planning on launching a pico some time though
[20:16] <Upu> just need the PCB's to turn up
[20:17] <OZ1SKY_Brian> We are ready for it, hi
[20:17] <OZ1SKY_Brian> Just got a phonecall today, permit allmost in order for a remote rx in Esbjerg city, on the south west coast of DK
[20:17] <Upu> I'll make sure I pick a trajectory that gets to you :)
[20:18] <Upu> oh super
[20:18] <Upu> what equipment ?
[20:18] <OZ1SKY_Brian> that should help cover the deadzone when the dutch loose signal
[20:18] <OZ1SKY_Brian> havent got that yet, wanted to get a permit first
[20:19] <OZ1SKY_Brian> if it check out, permit is for mounting a unit and antenne on top of a dockcrane, some 50-60meter asl
[20:20] <Upu> interesting :)
[20:20] <Upu> SDR ?
[20:20] <Maxell> I'm getting the error Unable to find current revision in submodule path 'habitat-cpp-connector' when trying to run 'git submodule update' for dl-fldigi...
[20:20] <OZ1SKY_Brian> ip based someting :-)
[20:20] <NickB1> @Upu received the pico pcbs http://jcpapillon.be/files/HAB/Falcon%20&%20PicoFalcon.JPG
[20:20] <Upu> what operating system Maxell ?
[20:21] <Upu> oh look at those :)
[20:21] <Upu> dual NTX2 and RFM22B :)
[20:21] <Maxell> Upu: Ubuntu 64 bits.
[20:21] <Upu> seen that somewhere before :)
[20:21] <Upu> you probably need to speak to one of the dl-fldigi developers Maxell
[20:22] <Upu> I'll ask bear with me
[20:22] <Upu> looks good Nick when is that launching ?
[20:23] <NickB1> thanks!
[20:24] <NickB1> got a launch app in for february
[20:24] <NickB1> pico maybe sooner :)
[20:25] <Upu> awesome
[20:26] <DanielRichman> Maxell: is this the first check out?
[20:26] <NickB1> going well with the power saving ?
[20:26] <DanielRichman> if so, try git submodule update --init
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[20:30] <Maxell> DanielRichman: no, it was the latest git-version
[20:30] <Maxell> But i'm running the ppa now.
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[20:33] <nigelvh> Upu, do you get your ublox's from them directly, or is there another retailer you get them from?
[20:33] <nigelvh> In summary, I'd like to find a source in the US.
[20:34] <Upu> I get them from the UK disty Alphamicro
[20:34] <Upu> Sure be interested to know what they charge
[20:34] <Upu> I know the Germany one is way more expensive
[20:34] <Upu> anyway buy them off me I'll do you a deal if you buy in bulk :)
[20:35] <nigelvh> The closest distro on their map is San Jose, CA, so I'll email them and see if they'll do low volumes. The most I'm really willing to fork over at present is about 5 modules.
[20:36] <nigelvh> Which generally isn't enough to get the bulk rates.
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[21:01] <arko> what a crazy busy day :/
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[21:06] Nick change: Laurenceb_ -> I2Cfail
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[21:24] <fsphil> in a bad way?
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[21:51] <arko> good way
[21:51] <arko> it's crunch time to get this spacecraft ready for ATLO
[21:55] <Upu> poly gnd
[21:55] <Upu> oh hai!
[21:55] <eroomde> which spacecraft arko ?
[21:59] <arko> SMAP
[22:00] <arko> getting closer to finishing this phase, but we are still far from ready for atlo
[22:00] <arko> and due to export laws, thats all i can say :/
[22:01] <arko> something something blah blah blah
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[22:02] <eroomde> something something something INCOMPLETE
[22:03] <arko> lol
[22:03] <arko> people just freak out a bit
[22:03] <arko> not really freak out but it's an important transisition
[22:05] <I2Cfail> suppp
[22:06] Action: I2Cfail grabs F303s from digikey
[22:07] <eroomde> your username is the name of an EE who's seen some things, and some stuff
[22:07] <I2Cfail> hehe
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[22:07] <I2Cfail> spent all week trying to make it work reliably on stm32f1
[22:07] <I2Cfail> going to get f303 as drop in replacement
[22:08] <I2Cfail> stupid thing locks up _all the time_
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[22:17] <nigelvh> Well, power test on my new tracker just completed. 5V system, 250mW APRS packets every 30 seconds, no GPS power saving, 18 hours 45 minutes on a 2000mAh lipo
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[22:23] <zyp> at what temperature?
[22:24] <nigelvh> Room temp
[22:24] <zyp> how realistic would that be in practice?
[22:24] <zyp> (honestly asking)
[22:25] <nigelvh> It would be lower as the batteries get colder. I know a lot of the UK guys don't like using lipos, and use the energizer ultimate lithium AA batteries instead.
[22:25] <zyp> are you going to charge the lipo during your flight?
[22:25] <nigelvh> Some lipos die at cold temperatures. I've never had an issue with it, but all batteries will exhibit less power when cold.
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[22:26] <nigelvh> No, and I probably won't use a battery that large either. I'm not planning for a floater, so if I cut the battery by half and get 6-9 hours out of it, I'll be happy
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[22:27] <zyp> so, why use a lipo when you are not going to charge it?
[22:28] <nigelvh> Because I could re-use it after the flight.
[22:28] <zyp> are lithiums expensive enough to make it matter?
[22:29] <nigelvh> However, in reality, I'll probably use one of the energizer ultimate lithium AA batteries. Lighter, better energy density.
[22:29] <zyp> right
[22:29] <nigelvh> No, they're not that expensive, I just have some lipos laying around, so that's what I tested with.
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[22:39] <Upu> ping Maxell
[22:43] <eroomde> arko: why did you name your sattelite after a japanese boy band? http://www.tokyohive.com/wp-content/uploads/2011/05/20110519_smap-600x406.jpg
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[22:43] <eroomde> or is the also ITAR protected information
[22:51] <arko> hahahaha
[22:51] <arko> brb, im printing this and posting in the project managers cubical
[22:56] <arko> probably not though
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[23:43] <gonzo___> is the world ready to end?
[23:45] <arko> meh
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[23:47] <jcoxon> i'm not ready
[23:48] <KT5TK_QRL1> There's hope. N0D was just found by a hunter!
[23:49] <gonzo___> any holes in it now?
[23:49] <gonzo___> and has it been stuffed and mounted
[23:49] <KT5TK_QRL1> The styrofoam box is intact
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[23:52] <jcoxon> hooray
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[00:00] --- Fri Dec 21 2012