highaltitude.log.20090925

[00:00] <swilly> have you looked into the cost of helium yet?
[00:00] <SpeedEvil> Not actually planning on using helium :)
[00:00] <swilly> ah - be safe!
[00:00] <SpeedEvil> I see nothing wrong with hydrogen
[00:00] <swilly> it's a liability my school isn't willing to take
[00:01] <SpeedEvil> Hydrogen burning in a large balloon is not exciting.
[00:01] <fuzzylugnuts> yeah
[00:01] <fuzzylugnuts> we launch with hydrogen
[00:01] <fuzzylugnuts> the stigma attached to it is very exadurated
[00:01] <SpeedEvil> you have basically something like a bonfire of the diameter of the balloon for 0.5s. And some flaming latex thrown around.
[00:01] <fuzzylugnuts> yeah
[00:01] <fuzzylugnuts> there is a youtube clip of it
[00:01] <SpeedEvil> Saw that - matched with what I'd expected.
[00:01] <swilly> we've blown up smaller balloons in our chemistry class
[00:02] <SpeedEvil> Of course if you're retarded enough to get oxygen in there too.
[00:02] <swilly> they knocked the ceiling tiles back into the rafters :)
[00:02] <fuzzylugnuts> Yeah, with air in them
[00:02] <SpeedEvil> but you need quite a lot of oxygen - and you'd generally have to really actually try.
[00:02] <fuzzylugnuts> yeah
[00:02] <swilly> right
[00:02] <fuzzylugnuts> hydrogen is so damn cheap too
[00:03] <fuzzylugnuts> we launch with 3 bigass 250cf tanks manifolded together
[00:03] <SpeedEvil> 'Is balloon empty before starting to fill' 'did I buy a pure hydrogen cylinder' is pretty much it.
[00:03] <fuzzylugnuts> Yep
[00:03] <fuzzylugnuts> the first one is easy because the balloon is usually all folded up
[00:04] <fuzzylugnuts> just ground all your tanks and fill gear to minimixe charge separation
[00:04] <SpeedEvil> And hydrogen leak fires are a real issue.
[00:04] <fuzzylugnuts> we wear nomex face masks and cotton cloths, thats all the PPE you really need.
[00:05] <SpeedEvil> Add someone with a extinguisher - and ...
[00:05] <fuzzylugnuts> not even that
[00:05] <fuzzylugnuts> someone mans the tanks while the others fill
[00:05] <fuzzylugnuts> if there is a problem they trow a ball valve
[00:06] <fuzzylugnuts> H2 has been used for ballooning for a long time, just take care and respect it
[00:08] <SpeedEvil> yeah
[00:08] <SpeedEvil> It's a fuel - it's not nerve gas.
[00:08] <fuzzylugnuts> exactly
[00:10] <fuzzylugnuts> we tried it once and was like "Damn, this is the ticket"
[00:10] <swilly> thanks for the help guys!
[00:10] <fuzzylugnuts> now its all we use
[00:10] <fuzzylugnuts> np
[00:18] <SpeedEvil> Though for first attempt, I'm planning on natural gas.
[00:19] <fuzzylugnuts> yeah?
[00:19] <fuzzylugnuts> that seems almost not worth it
[00:19] <SpeedEvil> Solely for the reason that there is a tap in my kitchen.
[00:19] <fuzzylugnuts> Haha, ok
[00:19] <fuzzylugnuts> oh how I've dreampt of taps
[00:20] <SpeedEvil> I was planning a metal foil balloon.
[00:20] <SpeedEvil> Which is silly.
[00:20] <SpeedEvil> But I don't think it has anything stopping it working.
[00:20] <SpeedEvil> It's at least UV stable.
[00:21] <fuzzylugnuts> yeah, mythbusters made one out of lead foil
[00:21] <fuzzylugnuts> the theory is there
[00:21] <fuzzylugnuts> its just... effort
[00:35] <Laurenceb> taps taps taps
[00:36] <Laurenceb> http://www.youtube.com/watch?v=y3mPC-bExIQ
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[18:29] <rjharrison> Hi all
[18:29] <rjharrison> Will be launching at 10 am ish tomorrow
[18:29] <rjharrison> Any listeners appreciated
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[18:43] Action: SpeedEvil wishes he had a 433MHz reciever, a yagi, and a 15km antenna mast.
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[19:11] <Hiena> ' evening!
[19:12] <SpeedEvil> '
[19:12] <Hiena> Anyody has a copy from the Morelli: Aircraft System Identification? Seems mine was stolen...
[19:13] <SpeedEvil> :/
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[21:45] <Laurenceb> hi
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[21:50] <Laurenceb> http://www.sparkfun.com/commerce/product_info.php?products_id=8161 I was thinking of using two of those for a pitot sensor
[21:50] <Laurenceb> but actually the performance is comparible
[21:51] <Laurenceb> to freescale
[22:05] <rjharrison_> hi all a launch tomorrow at 10am BST
[22:07] <Laurenceb> who from?
[22:19] <SpeedEvil> Elvis!
[22:21] <Laurenceb> lol
[22:22] <SpeedEvil> rjharrison: Hi all
[22:22] <SpeedEvil> rjharrison: Will be launching at 10 am ish tomorrow
[22:22] <SpeedEvil> rjharrison: Any listeners appreciated
[22:25] <Laurenceb> ah cool
[22:26] <Laurenceb> whats he launching?
[22:26] <SpeedEvil> no idea.
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[23:34] <fuzzylugnuts> Hey
[23:34] <fuzzylugnuts> I called up about the price of h2 vs helium today.
[23:35] <natrium42> o'rly?
[23:35] <fuzzylugnuts> a 200ft^3 tank of H2 cost 47 bucks, while the He cost 80 something
[23:35] <fuzzylugnuts> the price deffinatly came down
[23:35] <fuzzylugnuts> this was from holston gas, though
[23:36] <fuzzylugnuts> I remember Airgas being cheaper
[23:36] <natrium42> neat, so He is not that much more
[23:36] <fuzzylugnuts> yeah
[23:36] <natrium42> of course lift is less, but...
[23:37] <fuzzylugnuts> yeah, for some itmight be worth it
[23:37] <fuzzylugnuts> we usually get 3 200ft^3 tanks
[23:37] <fuzzylugnuts> so its alot of money for us
[23:40] <SpeedEvil> You're launching big payloads?
[23:40] <fuzzylugnuts> yeah, we're almost always at the faa exemption limit of 12lbs
[23:41] <fuzzylugnuts> we launch a fairly long payload string with alot of different stuff on it. One of the things we do is launch the apparatus of a 3rd grade egg drop competition
[23:42] <fuzzylugnuts> whoever wins gets to send it up
[23:42] <fuzzylugnuts> so the kids love it
[23:42] <Laurenceb> are there any clever digital low pass filter designs?
[23:42] <fuzzylugnuts> they are all clever equally and without effort
[23:43] Action: Laurenceb is working on wind estimation for a UAV
[23:43] <Laurenceb> trying to improve on the DIYdrones code
[23:44] <Laurenceb> Im thinking you can approximate wind as a very slowly varying heading and varying speed with a frequency spectrum under 0.3Hz or so
[23:44] <fuzzylugnuts> natrium42: we send up some nikon SLR camera too for high res shots. i don't know the model but its the lightest one we could find.
[23:44] <fuzzylugnuts> last year the prints sold for an amount equal to our nasa funds
[23:44] <SpeedEvil> stripped, or as it came/
[23:44] <SpeedEvil> ?
[23:45] <natrium42> fuzzylugnuts: oh, cool
[23:45] <fuzzylugnuts> as it came
[23:45] <SpeedEvil> Oh - SLR
[23:45] <SpeedEvil> not dslr
[23:45] <fuzzylugnuts> to be honest I don't know
[23:45] <fuzzylugnuts> our advisor is a photography professor so he deals with that
[23:45] <Laurenceb> do you automatically accumulat phase lag or latency if you use a low pass filter like this?
[23:45] <SpeedEvil> Do you have to develop the film/
[23:45] <fuzzylugnuts> OOooooooooooh
[23:45] <fuzzylugnuts> yeah, digital
[23:46] Action: SpeedEvil has not heavily done digital filtering.
[23:46] <Laurenceb> I'll have to read up on it then :P
[23:51] <rjharrison_> Back
[23:51] <rjharrison_> Sorry been busy getting everything together
[23:51] <fuzzylugnuts> wb
[23:52] <rjharrison_> Will be launching tomorrow at 10am
[23:52] <fuzzylugnuts> Cool!
[23:52] <Laurenceb> whats flying?
[23:52] <natrium42> so early! (for me...)
[23:52] <rjharrison_> Icarus II on an advertising mission
[23:53] <fuzzylugnuts> recruiting?
[23:53] <Laurenceb> cool, who for?
[23:53] <rjharrison_> The Sun
[23:55] <SpeedEvil> Will there be page 3 lovelies there?
[23:55] <rjharrison_> No
[23:55] <natrium42> d'oh
[23:55] <rjharrison_> Unfortuntly not
[23:55] <SpeedEvil> You're not painting the balloons pink, and launching 2?
[23:56] <rjharrison_> No
[23:56] <rjharrison_> Quite simple actually and low key
[23:56] <rjharrison_> I may even have to stoop to buying a copy in a few months time assuing they use the stuff
[23:59] Action: Laurenceb tries to find the 3D streakers
[23:59] <SpeedEvil> :)
[23:59] <Laurenceb> I think the 3D oxofrd site is no more :-(
[00:00] --- Sat Sep 26 2009