highaltitude.log.20070602

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[11:52] <jcoxon> morning all
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[11:56] <jcoxon> hey phatmonkey
[11:56] <phatmonkey> hey jcoxon
[11:57] <jcoxon> hows AS's going?
[12:32] <jcoxon> bbl
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[21:18] <Sbear> Hi, back again. Bit later that after Dr Who, but I Have been doing soma gardening.
[21:18] Nick change: whiteknight -> jcoxon
[21:19] <jcoxon> hi Sbear
[21:19] <Sbear> Hi, I'm Stephen that has been E-mailing you.
[21:19] <jcoxon> oh right, cool
[21:20] <jcoxon> you wanted to know about meteor
[21:20] <Sbear> Just curious, how is the Meteor parchute going to be suspended from the ballooon?
[21:21] <jcoxon> hehe, well actually i'm not completely sure that meteor is going ahead
[21:21] <jcoxon> the Cambridge Spaceflight are mainly focusing on their rocket
[21:21] <jcoxon> that said there is a parafoil project going on
[21:22] <jcoxon> http://wiki.ukhas.org.uk/projects:parafoil
[21:22] <Sbear> Oh, shame about meteor. Still I have a bit of info that may be useful if a parafoil is still going ahead.
[21:22] <jcoxon> where the parafoil will be deployed from a 'bag'/container
[21:22] <jcoxon> using a drogue
[21:22] <jcoxon> http://wiki.ukhas.org.uk/projects:parafoil:designs
[21:22] <jcoxon> (of course its only a theory
[21:23] <jcoxon> )
[21:23] <Sbear> Best idea is to deploy from a bag, I know someone who also drops bears and they tried a parafoil ready deplyed.
[21:24] <Sbear> It did not work that well average of 33 0/0 sucsess
[21:24] <jcoxon> now thats interesting
[21:24] <jcoxon> i assume if predeployed they get tangled up
[21:25] <Sbear> Yes, also the chute has to have a slight 'nose down' attitude.
[21:26] <Sbear> When deployed
[21:26] <jcoxon> okay
[21:26] <jcoxon> once my exams are done with I was planning to getting round to testing the deployment
[21:26] <jcoxon> first at low altitude
[21:26] <jcoxon> and then high altitude
[21:27] <Sbear> OK, for low alt try droping from a kite, you should be able to see what hapens.
[21:28] <Sbear> and you can do several drops in one day
[21:28] <jcoxon> indeed
[21:28] <jcoxon> when testing the payload we actually drop from a tethered balloon
[21:28] <jcoxon> it can lift more weight and is more stable
[21:28] <jcoxon> but for the deployment system itself the kite will do the trick
[21:29] <Sbear> how heavy is the payload? as a dummy will be needed to test.
[21:29] <Sbear> and if you know I can sujest the type of kite to use
[21:29] <jcoxon> ummm still working on the weight
[21:30] <jcoxon> that would be helpful
[21:30] <jcoxon> at the moment the payload has loads of additions
[21:30] <jcoxon> to measure things like the servos and accelerometer
[21:30] <jcoxon> and hasn't the most weight efficent power supply
[21:31] <jcoxon> i reckon it'll be about 800g in total
[21:31] <Sbear> OK, I have a kite that in the right wind conditions will lift 16 FULL 500cl beer cans. mind you it has to be quite windy.
[21:32] <jcoxon> hehe
[21:32] <jcoxon> thats also the problem
[21:32] <jcoxon> we are trying to test with low winds
[21:32] <jcoxon> makes it easier to control the payload
[21:32] <jcoxon> at this stage
[21:33] <Sbear> true. Will have to think about what to use, maybe ask a kitemaker friend of mine.
[21:33] <jcoxon> that would be great
[21:34] <jcoxon> should make alot more progress once exams are done
[21:34] <Sbear> will contact friend later and ask him
[21:36] <jcoxon> so Sbear you drop bears?
[21:36] Action: jcoxon isn't totally sure what that is
[21:38] <Sbear> OK. I drop bears (on parachutes) at charity events. People bring thier bear and pay to have it dropped.
[21:38] <Sbear> Also I do the ocasional disply at kite festivals with my own bears.
[21:39] <jcoxon> what do you use for a cutdown?
[21:39] <jcoxon> and how about a bear from 20km :-D
[21:40] <Sbear> 20K NO WAY! Cutdown I have a device with a tube on it, that has slots to hold the bear,
[21:41] <Sbear> and has a wire going thro, I just pull the wire out with a seperate line to release
[21:41] <jcoxon> okay
[21:41] <jcoxon> i'm always interested in cutdown methods
[21:42] <Sbear> BTW regaurds 20k alt, not sure but at one fest sveral years ago
[21:42] <Sbear> a bear droped (not by me) for charity caught a thermal and was last seen
[21:43] <Sbear> at about 2000ft and still going up!
[21:43] <jcoxon> wow
[21:43] <jcoxon> from 20km i'd have a payload with it
[21:43] <jcoxon> tracking it, gps, radio
[21:43] <jcoxon> etc
[21:43] <jcoxon> it would be more of a passenger
[21:44] <Sbear> good idea, or how about radio controll deployment of the chute,
[21:44] <Sbear> let it drop a good 17k or so then deploy it.
[21:44] <jcoxon> yeah
[21:44] <jcoxon> thats doable
[21:44] <jcoxon> i'd set it up to come off the gps unit
[21:44] <jcoxon> so when the gps reports 3km altitude
[21:45] <jcoxon> release
[21:45] <jcoxon> though of course on the way down
[21:45] <jcoxon> not up
[21:45] <Sbear> :)
[21:46] <jcoxon> could actually make a tiny little bear back pack
[21:46] <jcoxon> with gps and radio
[21:46] <jcoxon> let it parachute down and report its position
[21:46] <jcoxon> have the parachute predeployed
[21:46] <jcoxon> off the balloon
[21:46] <Sbear> Cool
[21:47] <Sbear> anyhow enough of bears... how about the rocket?
[21:48] <Sbear> seems the test one came down about 12 miles from where I live
[21:48] <jcoxon> oh right
[21:48] <Sbear> thats if it was near Findon/ Irthlingborough
[21:49] <jcoxon> hasn't been much activity in the last couple of weeks
[21:49] <jcoxon> but i have a feeling it'll start up soon
[21:49] <jcoxon> i'm not too sure on the status
[21:49] <Sbear> busy with exams etc
[21:49] <jcoxon> yeah
[21:49] <jcoxon> also launch permission ran out
[21:49] <jcoxon> we are waiting for it to be renewed
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[21:51] <Sbear> ok, talking about kites and highaltitude for a mo..
[21:51] <jcoxon> yup
[21:51] <Sbear> group of peeps from the club I belong to,
[21:52] <Sbear> tried last year to set a amatuer record for a train of kites
[21:52] <Sbear> done from a site near the wash.
[21:52] <jcoxon> cool
[21:53] <jcoxon> did you get it?
[21:53] <Sbear> Did not go to well got to about 8.000 ft. Were hoping for 15.000. World record for atrain fo kites is....
[21:54] <Sbear> 31.955 by prusian weather Bureau in 1919! STILL NOT BROKEN EVEN WITH TODAYS TECHNO!#
[21:55] <jcoxon> wow
[21:55] <Sbear> I thnk that is definatly highaltitude... :)
[21:56] <jcoxon> not bad at all
[21:56] <jcoxon> how does a train of kites work?
[21:57] <Sbear> several kites spaced out on a line, each kite helps lift the line
[21:58] <jcoxon> takes the weight of the line
[21:58] <jcoxon> right i get it
[21:58] <jcoxon> guess you need special CAA permission
[21:59] <Sbear> yes. At some festivals the clearance can be as much as 3.000ft
[22:00] <Sbear> but that is not very common. Useualy 1.500 ft
[22:00] <Sbear> or 1.000ft
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[22:01] <jcoxon> what went wrong with the record attempt?
[22:02] <Sbear> Line was spliced together to make one long lenght, broke at one of the splices.
[22:03] <jcoxon> gonna try again?
[22:03] <Sbear> aparently will be a year or two before they try again, as they lost 3 kites. They were specialy made.
[22:05] <Sbear> also lost the data equipment as well £££'s spent on it.
[22:06] <jcoxon> oh dear
[22:07] <Sbear> can't remember where it ended up, but think like your pegasus 2 it was somewhere in the north se.a
[22:08] <jcoxon> tis always the risk
[22:09] <Sbear> true. any way record for single kite is about 13.500ft. Not too sure on the exact alt as I have not got the book with the info in any more
[22:10] <Sbear> was set in the USA about 4-5 years ago.
[22:10] <jcoxon> thats a decent height
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[22:11] <Sbear> yes, Kite was BIG 30ft span delta... imagine a normal hang glider.. but used as a kite.
[22:11] <jcoxon> wow
[22:12] <Sbear> wow inded.
[22:14] <jcoxon> right Sbear i'm gonna have to go
[22:14] <jcoxon> it was good talking to you
[22:14] <Sbear> you too, also got to go.
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[00:00] --- Sun Jun 3 2007