highaltitude.log.20060520

[00:07] Action: macfreak4 finished his voltage regulation schematic
[00:10] <Tiger^> which voltage regulator did you use?
[00:10] <macfreak4> three, actually
[00:10] <macfreak4> 7805, 7812, and LM317T
[00:11] <macfreak4> oh wait!
[00:11] <macfreak4> forgot one
[00:11] <macfreak4> another LM317T for the laptop
[00:11] <macfreak4> so that's 5v, 12v, 7v, and 20v
[00:11] <Tiger^> oh ;)
[00:12] <macfreak4> i know, it's a lot
[00:12] <Tiger^> another four heaters, great :P
[00:12] <macfreak4> ya
[00:12] <macfreak4> hehe
[00:12] <macfreak4> well at least I don't have to worry about the electronics freezing to death
[00:12] <Tiger^> that's right
[00:12] <macfreak4> i just have to worry about them blowing themselves up
[00:12] <Tiger^> i'm using a single lm2940
[00:12] <Tiger^> low drop 5V
[00:13] <Tiger^> and 4 or 6 AA lithiums
[00:13] <Tiger^> i haven't decided yet
[00:13] <macfreak4> i've got 40 :P
[00:13] <Tiger^> i'm leaning towards 6, 9V leaves some margin
[00:14] <Tiger^> and another 6 for the radio
[00:14] <Tiger^> but the radio doesn't need an external regulator
[00:14] <Tiger^> and another 4 for the cutdown ;)
[00:15] <macfreak4> ya the reason I need a regulator for the HT is because it's tied to all 40 AAs
[00:15] <macfreak4> and it needs 6-7v
[00:16] <macfreak4> so it'll definitely be heating up
[00:16] <macfreak4> which is why it's on a substantial heatsink :P
[00:16] <Tiger^> don't forget silicon paste
[00:16] <Tiger^> :)
[00:16] <macfreak4> well
[00:16] <macfreak4> i got them from this old power supply
[00:17] <macfreak4> and it had these little heat pads
[00:17] <macfreak4> don't know what they are
[00:17] <macfreak4> but i used them instead
[00:17] <Tiger^> oh these
[00:17] <Tiger^> yeah, they work
[00:17] <macfreak4> ok good
[00:17] <macfreak4> one of my darlington's doesn't have one but that's ok -- it won't be dissipating much heat
[00:18] <macfreak4> (will only be handling about 0.5A)
[00:19] <Tiger^> and i do have a heatsink on my cutdown mosfet
[00:19] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) joined #highaltitude.
[00:20] <Tiger^> 6-8A
[00:20] <Tiger^> i used a standard TO220 heatsink
[00:20] <macfreak4> 7-8A for your nichrome wire?!?!
[00:20] <macfreak4> good heavens!!
[00:20] <Tiger^> hehe
[00:20] <Tiger^> ok, 6A
[00:20] <Tiger^> not 8
[00:21] <macfreak4> 500mA cuts nylon rope just fine over here, thank you very much
[00:21] <Tiger^> lol
[00:21] <macfreak4> would rather not see my balloon come down in a flaming ball of fire
[00:21] <macfreak4> hehehe
[00:21] <macfreak4> nah you'll be fine
[00:21] <Tiger^> you know
[00:21] <Tiger^> it won't be more than 50 watts
[00:22] <Tiger^> and besides
[00:22] <Tiger^> remember that up there you have what, 1% of ground level oxygen?
[00:23] <macfreak4> yeah but that doesn't matter when you burn something, does it
[00:23] <macfreak4> i guess it cant catch fire then, though
[00:24] <Tiger^> besides nothing near the wire supports combustion
[00:24] <macfreak4> oh well
[00:24] <Tiger^> nylon = melts, styrofoam = melts, ripstop nylon = melts&is cut, balloon = bursts&melts
[00:24] <macfreak4> stop ruining my fantasy!
[00:24] <Tiger^> hehe
[00:25] <Tiger^> no fireballs on my flight, please
[00:25] <Tiger^> it'd be an interesting experiment though
[00:25] <Tiger^> separate a secondary payload
[00:25] Action: macfreak4 was just about to say that!
[00:25] <Tiger^> full of flammable materials
[00:25] <macfreak4> drop a fireball off the balloon at 20,000 ft
[00:25] <macfreak4> hehehe
[00:25] <Tiger^> yeah
[00:26] <macfreak4> you could track it from the ground very easily then
[00:26] <Tiger^> easy way to start a forest fire though :(
[00:26] <macfreak4> well gotta make sure it doesnt have enough fuel to keep burning till it hits the ground
[00:26] <Tiger^> yeah, or attach a tertiary payload with an extinguisher ;P
[00:27] <Tiger^> lol
[00:27] <macfreak4> lol
[00:27] <Tiger^> (i guess we've just hit the weight limit ;>)
[00:29] <macfreak4> ya no kidding :P
[00:29] <Tiger^> i'm considering switching from balloon design to military grade explosives
[00:30] <Tiger^> when i think about my pcb house
[00:30] <Tiger^> ;)
[00:30] <Tiger^> i've lost the whole weekend
[00:30] Action: macfreak4 is confused
[00:32] <Tiger^> like i said before, the pcb house mailed me my pcbs on tuesday
[00:32] <Tiger^> and they're not here yet
[00:32] <macfreak4> ooooh
[00:32] <macfreak4> now "lost the whole weekend" makes a lot more sense
[00:32] <macfreak4> gotcha
[00:32] <Tiger^> yeah
[00:32] <macfreak4> well i gotta eat dinner now
[00:32] <macfreak4> maybe be back later...
[00:33] <Tiger^> ok
[00:59] <macfreak4> back
[01:00] <jcoxon> hey all
[01:00] <macfreak4> hey
[01:00] malgar (n=malgar@adsl-ull-14-218.47-151.net24.it) left irc: "*** E' solo l'urto con un iceberg, che vuoi che sia, questa è una nave inaffondabile. *** 75$/barile"
[01:02] <macfreak4> hey that's nifty
[01:02] <macfreak4> eagle has PIC objects built-in
[01:06] <Tiger^> yeah, avr too
[01:07] <macfreak4> that's really nice
[01:07] <macfreak4> slick
[01:09] <Tiger^> btw
[01:09] <Tiger^> http://moo.pl/~tygrys/junk/bal/16.html
[01:09] <Tiger^> here's my regulator ;)
[01:10] <jcoxon> cool
[01:10] <macfreak4> oh pph
[01:10] <jcoxon> i don't get a regulator on my tanks
[01:10] <macfreak4> thought you meant your voltage regulator
[01:10] <macfreak4> lol
[01:10] <macfreak4> cool
[01:10] <Tiger^> hehe
[01:10] <Tiger^> i always liked to play with things like that
[01:10] <Tiger^> i even have my own oxy-acetylene welding torch!
[01:10] <Tiger^> ;)
[01:11] <jcoxon> !!!
[01:11] <jcoxon> i'd be very interested about how much gas you need for the balloon
[01:11] <Tiger^> jcoxon: you mean you don't use a regulator at all??
[01:11] <jcoxon> nope
[01:11] <jcoxon> :-p
[01:11] <Tiger^> hmm
[01:11] <Tiger^> big *hmm*;)
[01:12] <Tiger^> i'd think that 2000 psi kills a balloon instantly
[01:12] <macfreak4> definitely
[01:12] <macfreak4> how does that work??
[01:12] <macfreak4> turn the knob just a little?
[01:12] <Tiger^> and then your dog kicks the knob...
[01:12] <Tiger^> ;)
[01:12] <macfreak4> haha
[01:12] <jcoxon> if you get your tanks from a normal commercial supplier
[01:13] <jcoxon> for helium balloons
[01:13] <jcoxon> you just get a nozzle
[01:13] <macfreak4> does the nozzle they give you fit properly? that's my biggest worry over here
[01:14] icez (n=icez@ip68-3-56-121.ph.ph.cox.net) joined #highaltitude.
[01:15] <jcoxon> oh i have a convertor
[01:16] <macfreak4> o ok
[01:16] <Tiger^> oh
[01:16] <Tiger^> the nozzle is a tilt valve, right?
[01:16] <jcoxon> as in if you bend the rubber bit gas comes out?
[01:16] <Tiger^> yeah
[01:16] <jcoxon> yeah
[01:17] <Tiger^> well it'd take forever to fill a 1500 gram balloon with that :(
[01:17] <jcoxon> then i have a hosepipe to a bit of plumbing
[01:17] <jcoxon> not that long
[01:17] <jcoxon> i've done 1200gm!
[01:17] <Tiger^> and how long does it take?
[01:17] <jcoxon> 15mins
[01:17] <Tiger^> yeah, too long
[01:18] <Tiger^> as i'll be launching from a remote rural area
[01:18] <jcoxon> why?
[01:18] <macfreak4> 15 mins really isn't long at all
[01:18] <Tiger^> i'm afraid some kids can, like, shoot at the balloon
[01:18] <macfreak4> unless you're by yourself
[01:18] <jcoxon> depends how many people are doing the launch
[01:18] <Tiger^> from a sling
[01:19] <jcoxon> hmmmm
[01:19] <Tiger^> macfreak4: i'm by myself
[01:19] <jcoxon> but it is remote!
[01:19] <macfreak4> oh
[01:19] <jcoxon> but yeah i could see that being harder
[01:19] <Tiger^> jcoxon: not *that* remote ;)
[01:19] <jcoxon> my father filled the balloon while i prepared the payload
[01:19] <jcoxon> actually about 5 people filled the balloon
[01:19] <Tiger^> yeah
[01:19] <Tiger^> that's a lot easier
[01:19] <jcoxon> and 5 people helped with the payload
[01:19] <jcoxon> yeah
[01:19] <Tiger^> my wife will be helping
[01:19] <Tiger^> but
[01:19] <jcoxon> well again i'd be interested in pressures etc...
[01:20] <Tiger^> it'll take two people just to fill the balloon
[01:20] <jcoxon> yeah
[01:20] <macfreak4> can't you find just one other person?
[01:20] <jcoxon> right guys i've got to go to bed
[01:20] <macfreak4> i'm sure *someone* has got to be interested
[01:20] <macfreak4> kk cya
[01:20] <Tiger^> jcoxon: i just hope a 250 cubic feet tank will do
[01:20] <jcoxon> long day of revision tomorrow
[01:20] <Tiger^> bye jcoxon
[01:20] <jcoxon> night
[01:20] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) left irc: "Leaving"
[02:00] <macfreak4> you can calculate that, you know
[02:00] <macfreak4> volume, that is
[02:03] <macfreak4> here's a spreadsheet I put together:
[02:03] <macfreak4> http://macfreak4.homeunix.com/temp/Helium Calculations.xls
[02:15] <Tiger^> oh
[02:15] <Tiger^> great :)
[02:15] <Tiger^> i'll take a look at it tomorrow
[02:16] <Tiger^> time to sleep :)
[02:16] <Tiger^> 'nite
[02:17] <macfreak4> kk cya
[04:47] macfreak4 (n=macfreak@24-107-201-22.dhcp.stls.mo.charter.com) left irc:
[08:31] malgar (n=malgar@adsl-ull-116-222.47-151.net24.it) joined #highaltitude.
[09:14] Nick change: malgar -> malgar`A\C
[09:18] Nick change: malgar`A\C -> malgar
[09:24] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) joined #highaltitude.
[17:26] macfreak4 (n=macfreak@24-107-201-22.dhcp.stls.mo.charter.com) joined #highaltitude.
[17:33] <Tiger^> hi guys
[17:33] <macfreak4> hi
[17:33] <Tiger^> hi macfreak
[17:34] <macfreak4> :D
[17:34] <Tiger^> your spreadsheet says i'm gonna use up 110-120 cubic feet of helium ;)
[17:34] <macfreak4> ya
[17:34] <macfreak4> sounds right
[17:34] <Tiger^> good job :)
[17:34] <macfreak4> thx
[17:35] <macfreak4> the guys at freespace had an 11.5 lb payload and they said they needed 200 cu ft (with the additional 1lb of lift)
[17:35] <macfreak4> and that's exactly what my spreadsheet says
[17:35] <macfreak4> so i think it works...
[17:35] <Tiger^> great :)
[17:35] <Tiger^> i'll try to make a CGI out of it
[17:35] <macfreak4> hehe
[17:35] <macfreak4> cool
[17:35] <macfreak4> so ppl can use it on the web?
[17:35] <Tiger^> yeah
[17:35] <macfreak4> javascript would suffice
[17:35] <macfreak4> *shruggs*
[17:35] <Tiger^> right
[17:36] <Tiger^> so javascript
[17:37] Action: Tiger^ is mad at the guys who put glues in thin tubes
[17:37] <macfreak4> haha
[17:37] <macfreak4> what are you gluing?
[17:38] <Tiger^> a few pieces of foam rubber to the bottom of the payload
[17:38] <Tiger^> for a smoother landing ;)
[17:38] <macfreak4> oh lol
[17:38] <macfreak4> i have been considering that myself
[17:39] <macfreak4> i'd probably need a couple of layers, tho
[17:39] <macfreak4> 8lbs is a lot
[17:39] <Tiger^> don't they know that when you squeeze the tube a bit glue comes out of everywhere but the nozzle? ;)
[17:39] <macfreak4> what about hot glue?
[17:39] <macfreak4> quick and dirty
[17:39] <macfreak4> maybe not so adhesive though
[17:39] <Tiger^> hot glue doesn't stick to the foam rubber
[17:39] <macfreak4> oh
[17:39] <Tiger^> i'm using RTV
[17:39] <Tiger^> black silicone
[17:39] <macfreak4> oh
[17:40] <Tiger^> i used two layers about 3/4" thick
[17:40] <macfreak4> two layers of foam?
[17:40] <Tiger^> yeah
[17:40] <macfreak4> o kk
[17:40] <Tiger^> i don't need that much glue :P
[17:40] Action: macfreak4 thought you meant glue
[17:40] <Tiger^> hehe
[17:40] <macfreak4> hehe
[17:49] bluegerbil (n=bluegerb@i-83-67-99-89.freedom2surf.net) joined #highaltitude.
[17:50] <bluegerbil> hello?
[17:50] <macfreak4> hi
[17:50] <macfreak4> welcome
[17:50] <macfreak4> :D
[17:50] <bluegerbil> cheers :D
[17:50] <bluegerbil> pretty quiet here, no?
[17:50] <macfreak4> well, when everyone's on it gets chatty but not now
[17:51] <bluegerbil> ya, by all accounts I should be revising right now :/
[17:51] <macfreak4> revising?
[17:51] <bluegerbil> so, you a balloonist?
[17:51] <macfreak4> ya
[17:51] <bluegerbil> exams. student still :)
[17:51] <macfreak4> oh same
[17:51] <macfreak4> but i'm not studying yet
[17:51] <bluegerbil> may I ask where?
[17:51] <macfreak4> st. louis, USA
[17:52] <bluegerbil> ah... nice place. visited once
[17:52] <macfreak4> really?
[17:52] <bluegerbil> I'm at Warwick, in the UK
[17:52] <macfreak4> then you must not have seen downtown, then ;)
[17:53] <bluegerbil> trying to assemble a team to build us a balloon, pegasus-style
[17:53] <bluegerbil> no, just visiting a mate in the suburbs
[17:53] <macfreak4> oh yea st. louis county is much more organized than the city
[17:53] <macfreak4> (are two separate entities)
[17:53] <macfreak4> so you're going the cell phone route?
[17:54] <bluegerbil> at the moment. as an academic exercise we're hoping for some sort of comms on flight 2 but at the moment it's pretty much a clone operation until we get to grips with it
[17:54] <macfreak4> o ok
[17:54] <bluegerbil> the laws here make in-flight comms a real difficulty :/
[17:55] <macfreak4> yah the uk is a bit tight about that
[17:55] <macfreak4> so i've heard
[17:55] <macfreak4> well this is my first balloon project, too
[17:55] <macfreak4> if you want, I've got a page about my balloon project thus far
[17:55] <bluegerbil> oh, sorry, being pulled away. I'll come chat about it all later!
[17:55] <macfreak4> http://macfreak4.homeunix.com/projects/ensure/index.html
[17:55] <macfreak4> ok
[17:55] <bluegerbil> good to meet ya
[17:55] <macfreak4> u 2
[17:55] <macfreak4> cya
[18:51] <jcoxon> hey all
[18:52] <bluegerbil> hiya
[18:53] <bluegerbil> got your email - thanks for the quick reply!
[18:53] <jcoxon> oh any excuse not to work
[18:53] <bluegerbil> heh, same - exams looming I take it?
[18:53] <jcoxon> yup
[18:54] <bluegerbil> I'm right in the middle of mine - sucks but soon will all be over, and then we party.
[18:54] <jcoxon> hehe
[18:55] <bluegerbil> nice work by the way with pegasus. it's a really fun idea
[18:55] <jcoxon> oh thanks
[18:55] <jcoxon> high altitude balloons are quite popular in the US
[18:55] <jcoxon> just a little harder here
[18:56] <bluegerbil> yeah, I've been reading about them
[18:56] <jcoxon> though it seems that UK univeristies are getting interested
[18:56] <bluegerbil> well, always up for a challange! just... not of the legal kind :/
[18:56] <bluegerbil> apart from yours and oxford, who else is thinking of it?
[18:57] <jcoxon> oh thats it
[18:57] <jcoxon> though the cambridge one is quite big
[18:57] <jcoxon> well will be
[18:57] <bluegerbil> more lifting power?
[18:58] <jcoxon> oh no lots of people involved
[18:58] <bluegerbil> ah right
[18:58] <bluegerbil> I'm hoping to assemble a group of 4-6 for ours if we get the go-ahead
[18:59] <jcoxon> cool
[18:59] <jcoxon> good size
[18:59] <bluegerbil> so, the project you're working on now - is it academic? for your course? or just a hobby?
[18:59] <jcoxon> pegasus is just a hobby
[18:59] <jcoxon> i'm actually a medic
[19:00] <jcoxon> nova is semi academic for the engineers involved
[19:05] <jcoxon> pegasus is sort of becoming a test bed for crazy ideas
[19:05] <jcoxon> (though Pegasus III is a return to flight mission)
[19:06] <bluegerbil> yeah, unlucky with P2...
[19:06] <jcoxon> i made to many mistakes with it
[19:06] <jcoxon> definitly learnt from them
[19:07] <bluegerbil> I imagine those high-altitude winds are a little harder to predict... certainly not on the 0915 weather report!
[19:07] <jcoxon> hehe
[19:07] <jcoxon> i've got some sources
[19:07] <jcoxon> but they aren't great
[19:07] <bluegerbil> yeah - i'm worried we'll be rushing things also. two flights, roughly the same as P1 and 2, in 30 weeks..
[19:08] <jcoxon> i don't think thats rushing
[19:08] <jcoxon> if your first works then its fine
[19:08] <jcoxon> i had to start again with Peg II
[19:08] <jcoxon> fried my gumstix
[19:08] <jcoxon> and also took another approach
[19:08] <bluegerbil> well, the second is my concern - we're doing a big leap from 1 to 2..
[19:08] <jcoxon> how big a leap?
[19:10] <bluegerbil> from a simple proof-of-concept (with camera & locator) to a scientific mission (several science packages, more cameras, duplex comms & maybe even a glider)
[19:10] <jcoxon> hmmm thats quite a leap
[19:10] <jcoxon> but
[19:10] <jcoxon> launches are actually quite easy
[19:10] <jcoxon> new balloon, helium and batteries
[19:10] <jcoxon> and cheap
[19:11] <jcoxon> therefore there is no reason to put perhaps a launch in between
[19:11] <bluegerbil> we're basically going to scale 2 depending on 1's success and development time
[19:11] <jcoxon> pegasus 2 failed for many reasons
[19:11] <jcoxon> for example i shifted to a compactflash gps
[19:11] <bluegerbil> oh, for 2 we were hoping to add a pressure release valve and preserve the canopy..
[19:11] <jcoxon> bad move
[19:11] <bluegerbil> why so?
[19:12] <jcoxon> the compact flash holder on the flight computer isn't that secure
[19:12] <jcoxon> plus the antenna wasn't great
[19:12] <jcoxon> didn't really get a lock
[19:12] <jcoxon> now i've got a nice active antenna
[19:12] <jcoxon> much happier
[19:13] <bluegerbil> hmm..... do GPS modules ever allow some manner of exernal antenna?
[19:13] <jcoxon> yes
[19:13] <jcoxon> its pretty much the norm now
[19:13] <jcoxon> what flight computer system are you thinking of?
[19:14] <bluegerbil> one of the computer-on-a-chip devices... I know the systems guy is a fan of gumstix but we're not decided on anything yet
[19:14] <jcoxon> right
[19:15] <jcoxon> nova are using a pic
[19:15] <jcoxon> i'm just intersted in other peoples approaches
[19:16] <bluegerbil> a microcontroller - hmm, could work but I'm thinking there's a speed of development edge with the pc boards
[19:16] <jcoxon> oh i agree
[19:17] <bluegerbil> one other alternative considered was to put all the control functions on the phone device
[19:17] <jcoxon> hehe we have interesting debates
[19:17] <jcoxon> i'm a fan of gumstixs while another member of nova likes pics
[19:17] <jcoxon> there is a guy robhouse who has got it all on a smart phone
[19:17] <jcoxon> with bluetooth gps module
[19:17] <bluegerbil> or - and this borders on cheating - get a phone with integrated GPS :D
[19:18] <jcoxon> hehe
[19:18] <bluegerbil> yeah
[19:18] <jcoxon> if it works it works :-p
[19:18] <bluegerbil> bluetooth? that's overkill surely?
[19:18] <bluegerbil> yeah
[19:18] <jcoxon> easier then connecting them by wires
[19:19] <bluegerbil> I'll be working on this for a over half year so I'll be wanting to get more work that just a day's :D
[19:19] <jcoxon> yeah
[19:19] <jcoxon> i've got 12 weeks this summer
[19:19] <bluegerbil> maybe - but the power drain I would have thought would have been excessive
[19:19] <jcoxon> and 2 weeks in Niger :-D
[19:19] <bluegerbil> niger?
[19:19] <jcoxon> yup
[19:19] <bluegerbil> holiday?
[19:19] <jcoxon> nope
[19:19] <jcoxon> launching big balloons
[19:20] <jcoxon> with Cambridge atmospheric department
[19:20] <jcoxon> things like zero pressure :-D
[19:20] <bluegerbil> ah - you're really a balloon fan eh?
[19:20] <jcoxon> well they invited me
[19:20] <jcoxon> good excuse to go
[19:20] <bluegerbil> what altitude can tehy reach?
[19:20] <jcoxon> 100,000ft
[19:20] <bluegerbil> awesome. stick a camera on it :)
[19:20] <jcoxon> but for over a month if necessary
[19:21] <bluegerbil> btw, for altitude determination did you use an altimeter or just read the GPS altitude?
[19:21] <jcoxon> gps
[19:22] <bluegerbil> I imagine they float quite a way in that time...
[19:22] <jcoxon> yeah
[19:22] <jcoxon> actually these ones will only be a couple of days
[19:22] <jcoxon> but lifting heavy payloads
[19:22] <jcoxon> not sure how high an altimeter works to
[19:22] <jcoxon> though gps isn't meant to work above 18km
[19:23] <bluegerbil> what are they going to be carrying?
[19:23] <jcoxon> things like mass spectrometers etc
[19:23] <jcoxon> lots of payloads
[19:24] <bluegerbil> they recover them in the same sort of way?
[19:24] <bluegerbil> or do they have some clever return system?
[19:24] <jcoxon> as the balloons don't pop they just signal them to vent gas
[19:24] <jcoxon> from the top
[19:24] <jcoxon> and they drift down
[19:24] <jcoxon> i think
[19:24] <jcoxon> but they do go quite far distances
[19:25] <bluegerbil> we're hoping for something like that if we get a communications channel working
[19:26] <bluegerbil> not a big fan of bursting balloons :)
[19:26] <jcoxon> zero pressure balloons require quite a lot of experience
[19:26] <macfreak4> hey
[19:26] <jcoxon> due to their size and danger to aircraft
[19:26] <macfreak4> just got back
[19:26] <jcoxon> i'm only helping the french space agency who are pros
[19:26] <jcoxon> hey macfreak4
[19:26] <macfreak4> but whats the problem with bursting balloons?
[19:26] <bluegerbil> I can imagine. one of the US teams added a reflector to their design
[19:26] <bluegerbil> hi again
[19:27] <macfreak4> :D
[19:27] <macfreak4> reflector = radar reflector/
[19:27] <macfreak4> ?
[19:27] <jcoxon> macfreak4, sorry to hear about the postponment
[19:27] <bluegerbil> yup
[19:27] <macfreak4> oh yeah i'm really bummed
[19:27] <macfreak4> because it was going to be an event at school
[19:27] <macfreak4> they were going to announce it on the PA system
[19:27] Action: jcoxon has awful spelling
[19:27] <macfreak4> hehe
[19:27] <jcoxon> where are you go to do it now?
[19:28] <macfreak4> well its got to be at least 20 miles from the airport, which is well out of the city
[19:28] <macfreak4> I know a few people who live out there
[19:28] <macfreak4> so I'm going to ask around
[19:28] <jcoxon> oh okay
[19:28] <jcoxon> cool
[19:28] <jcoxon> well it gives you a little more time
[19:28] <macfreak4> yes this is a good thing
[19:28] <macfreak4> gives me time to study this weekend before finals next week
[19:28] <macfreak4> ;)
[19:29] <jcoxon> bluegerbil, so when will your first launch be?
[19:29] Action: jcoxon has only seen this many people on the channel once
[19:30] <bluegerbil> well, assembly's a way off yet - next academic year. I'm hoping to have 1 away around xmas
[19:30] <jcoxon> cool
[19:30] <bluegerbil> I'm just doing the research and design now so we can build it as soon as we get back
[19:30] <jcoxon> yeah
[19:30] <jcoxon> 3 of us have a grant for this summer
[19:30] <jcoxon> so there are going to be a lot of launches
[19:31] <jcoxon> i'm applying for a unlimited no. of launches 10 week licence
[19:31] <bluegerbil> ooi, you say you get your canopies via your atmospheric chem dept... know any other good uk suppliers?
[19:32] <jcoxon> met office
[19:32] <bluegerbil> wayhey - each with a different payload?
[19:32] <jcoxon> actually i get mine of ebays
[19:32] <jcoxon> well we'll be adding each launch
[19:34] <jcoxon> there arent that many supplies generally
[19:34] <jcoxon> but i've been told that the met office will sell you some
[19:35] <bluegerbil> not a huge market, that for weather balloons :) strange
[19:35] <jcoxon> hehe
[19:35] <bluegerbil> I'll ask. ebay does sound good though
[19:35] <macfreak4> meh i guess i cant help you there...
[19:35] <macfreak4> got mine from kaymont
[19:35] <macfreak4> really nice price, for being new and all
[19:35] <macfreak4> but its not in the uk
[19:36] <jcoxon> yeah kaymont ignore me :(
[19:36] <bluegerbil> well, I've got a fair bit of time yet so getting somehting shipped from there isn't out of the question if the price is good
[19:36] <macfreak4> they ignored you?
[19:36] <jcoxon> yeah
[19:36] <jcoxon> i've sent lots of emails
[19:36] <macfreak4> huh
[19:36] <macfreak4> thats strange
[19:37] <macfreak4> well when i emailed them they told me a 1200g balloon would be 70$ US plus 8-10$ shipping from New York
[19:37] <macfreak4> and when I called they said 65$, no shipping charge
[19:37] <macfreak4> so i duno
[19:37] <macfreak4> i guess you have to call to get a straight answer
[19:38] <macfreak4> but i know that their balloons are really good quality
[19:38] <macfreak4> from what i've heard
[19:38] <bluegerbil> are there 'dodgy' balloons around also?
[19:38] <bluegerbil> i imagine a bad balloon bursts lower?
[19:38] <macfreak4> yea
[19:38] <jcoxon> yeah
[19:38] <macfreak4> they have weak spots
[19:38] <jcoxon> if its dark its been exposed to too much light
[19:39] <bluegerbil> these things UV-sensitive then?
[19:40] <macfreak4> oh really... hadn't heard that before
[19:40] <jcoxon> yeah
[19:40] <macfreak4> that's good to hear
[19:40] <macfreak4> because i was going to buy a balloon on ebay but it was really dark
[19:40] <macfreak4> and they didn't look promising
[19:40] <jcoxon> there are some that are really really dark
[19:40] <jcoxon> thats quite normal
[19:41] <macfreak4> well it was brown-dark
[19:41] <macfreak4> hard to explain...
[19:41] <bluegerbil> I guess you nbeed to look for a non-uniform shading? parts wouldn't have been so exposed...
[19:41] <jcoxon> yeah
[19:41] <bluegerbil> you could link the picture?
[19:42] <macfreak4> yeah i'm looking for it
[19:42] <macfreak4> here
[19:42] <macfreak4> http://cgi.ebay.com/Weather-Balloon-Meteorological-Military-Huge-Giant_W0QQitemZ6628562254QQcategoryZ588QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[19:42] <macfreak4> i typed in its model number in google, and found someone who used one of these
[19:43] <macfreak4> and it popped at 14,000ft altitude :P
[19:43] <macfreak4> he had a 1kg payload, too, i think
[19:43] <macfreak4> that's REALLY bad
[19:44] <bluegerbil> to me that balloon looks - but obviously I'm no authority
[19:44] <bluegerbil> maybe just unlucky? a gust of wind or something?
[19:44] <macfreak4> what a balloon should look like: http://www.nstar.org/NSTAR/NSTAR02B-crowd.jpg
[19:46] <bluegerbil> true, but maybe it's a deliberate colouring
[19:46] <bluegerbil> as I say, I don't know...
[19:46] <macfreak4> no that white is natural
[19:46] <macfreak4> according to kaymont
[19:47] <jcoxon> i've got a nearly black balloon
[19:47] <macfreak4> oh really
[19:47] <jcoxon> bit thats normal
[19:51] <macfreak4> how does latex turn black, though?
[19:51] <jcoxon> not sure
[19:51] <macfreak4> and wouldn't the black cause it to heat up in the sun, especially with all that radiation at high altitude?
[19:51] <macfreak4> maybe that causes it to stretch more, though
[19:51] <jcoxon> yeah
[19:51] <jcoxon> perhaps
[19:51] <macfreak4> which could be a good thing
[19:51] <jcoxon> will have to see :-p
[19:51] <macfreak4> higher altitude
[19:51] <macfreak4> ya :D
[19:58] <bluegerbil> well I'd better get back to this revision. you'll no doubt be seeing me more!
[19:59] <jcoxon> cya
[20:00] <macfreak4> alright
[20:00] <macfreak4> bye
[20:01] bluegerbil (n=bluegerb@i-83-67-99-89.freedom2surf.net) left #highaltitude.
[20:10] malgar (n=malgar@adsl-ull-116-222.47-151.net24.it) left irc: "*** E' solo l'urto con un iceberg, che vuoi che sia, questa è una nave inaffondabile. *** 75$/barile"
[20:13] <macfreak4> whew drawing up schematics takes a lot of time
[21:28] <Tiger^> damn
[21:28] <Tiger^> sewing the ripstop nylon jacket is the hardest part
[21:30] <macfreak4> are you using a machine?
[21:30] <Tiger^> nope
[21:30] <macfreak4> yeah there isnt one in this house, either
[21:30] <macfreak4> :P
[21:32] <Tiger^> yeah, we've been sewing for, um, 2.5 hours. with a lot of f-words and s-words ;P
[21:32] <macfreak4> hehe
[21:34] <macfreak4> i guess it's too bad you can't work on the pcbs
[21:34] <macfreak4> at least theres other things to do...
[21:35] <macfreak4> like f-words and s-words
[21:35] <macfreak4> ;)
[21:53] <jcoxon> hey all
[21:55] <macfreak4> hi
[22:01] Action: jcoxon is bored
[23:53] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) left irc: "Leaving"
[00:00] --- Sun May 21 2006