highaltitude.log.20070128

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[00:04] <CablitoE> Hello there people
[00:04] <CablitoE> anyone "awake"?
[00:08] <CablitoE> Great Wiki.
[00:10] <icez> oops
[00:10] <icez> me!:P
[00:16] <CablitoE> hey
[00:17] <CablitoE> nice wiki... are we all welcome to add information?
[00:19] <CablitoE> Would I be wrong if I was to assume that if you had a rigid "body" on a balloon, more like a blimp, and therefore keeping the same volume, you would not be affected by external heat/cold factors?
[00:21] <CablitoE> As the heat builds up due to sunlight, instead of "expanding", the balloon/blimp made of a non-flexible material would just "have to be able to handle the pressure", but since volume would remain the same, it would not affect boyancy... Maybe a not-so-high altitude blimp would be a feasable solution for a long lasting "mission"
[00:23] <CablitoE> not-so-high being 20.000 meters... Add sollar panes (weight!) and you can have your energy for engines/onboard computers.
[00:24] <CablitoE> We were talking the other day about how effective would electric ducted fans would be at high atitude, but I really don't know where to start on estimating/calculating trust or speed potentials of ducted fans in high altitude (nor low for that matter).
[00:25] <CablitoE> Assuming a blimp would have sollar power and long airborne life (due blimp/no-burst concept)
[00:27] <CablitoE> a gumstick/computer+gps+ducted fan and software, it could autonomously "try" to stay on the same place constantly flying to that fixed waypoint. Even if the engines generate little trust/speed compared to winds/drift, it would always be trying to reach the waypoint therefore not drifting "at gods will"
[00:28] <CablitoE> Rc blimps can fly at up to 25 km/h down here on ground level
[00:29] <CablitoE> even though the "effectiveness" of the fans up there might be lower, so is the forward facing drag force
[00:29] <CablitoE> and I assume the ducted fans would produce faster vectors, so maybe the speed would actually be higher than down here
[00:47] <Golfgeo> <CablitoE> anyone "awake"?
[00:47] Action: Golfgeo is to
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[00:52] <CablitoE> hehe
[00:52] <CablitoE> be right back
[00:52] <CablitoE> did u read back my insanities?
[00:56] <jcoxon> instanities?
[01:00] <CablitoE> Well, to most people that surround me I sound like a lunatic
[01:00] <CablitoE> That frustrates me the most.
[01:02] <CablitoE> Most people I know are far more concerned about how much beer they will drink on the weekend, how the soccer team is going, the new honda civic engine and have no idea whatsoever why planes fly
[01:03] <jcoxon> hehe - tis a hard life we live :-D
[01:03] <jcoxon> i've got to be off in a sec
[01:03] <jcoxon> but reading about your rigid structure
[01:03] <CablitoE> So talking about my desire to build or talk about a blimp floating at high altitude does actually give them reason to think they should hospitalize me in a mental institution for my own good.
[01:03] <jcoxon> it would have to be pretty strong
[01:03] <CablitoE> Yeah, thats kinda half-baked isnt it?
[01:03] <jcoxon> and you would definitly get considerable leak
[01:04] <CablitoE> Helium has a really easy way of escaping through most things does it not.
[01:04] <jcoxon> i reckon the pressure difference between inside and outside would increase very rapidly
[01:04] <jcoxon> right i'm really sorry CablitoE but i've got to go to bed - its 1am here
[01:04] <jcoxon> feel free to edit hte wiki
[01:05] <jcoxon> and add yourself to the members list if you want]
[01:05] <jcoxon> night
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[10:54] <defy> hey :)
[11:24] <jcoxon> hey defy
[11:54] Action: defy waits for his new gumstix shipment
[12:27] <jcoxon> new?\
[12:57] <defy> I have 2 new gumstix and 2 new robostix coming
[12:58] <defy> I want to start putting together a balloon payload and don't want to rip apart other projects
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[15:07] <cablitoE> yo
[15:08] <cablitoE> morning (13:00 brazil time)
[15:29] <jcoxon> hey cablitoE
[15:43] <cablitoE> hey
[15:44] <cablitoE> air balast
[15:46] <cablitoE> Assuming the blimp would have *some flexibility* with a simple escape valve for overpressure (which would also be a leak source)
[15:46] <cablitoE> perhaps a way to control altitude would be using air balast
[15:46] <cablitoE> basically inflate a lower bags with air to "add weight"
[15:48] <cablitoE> btw: another half-baked idea from this morning.
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[00:00] --- Mon Jan 29 2007