highaltitude.log.20070429

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[18:27] <mc-> hi all, does anyone know if the mc payload was flown yesterday?
[18:38] <mc-> ok, it wasn't, just read my email
[19:03] mc- (n=mfcastle@cpc2-glfd1-0-0-cust995.glfd.cable.ntl.com) left irc:
[19:53] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) joined #highaltitude.
[19:53] <edwardmoore> hi james
[19:54] <jcoxon> hey edwardmoore
[19:55] <edwardmoore> have you had a look at the eclipse vid?
[20:00] <jcoxon> yup
[20:00] <jcoxon> pretty damn cool
[20:02] <edwardmoore> i was thinking that if the video transmitters have an audio channel, as most of them do, you could stick rtty down it
[20:02] <edwardmoore> anyway it's a potential solution to controlled pointing, although requires more mechanical effort than the compass method
[20:04] <jcoxon> indeed
[20:05] <jcoxon> once i get this first draft in i'll look into getting a bit of compass action
[20:05] <jcoxon> gonna need to rewrite the compass code
[20:05] <jcoxon> shouldn't be to difficult
[20:05] <edwardmoore> how's the draft going?
[20:06] <jcoxon> been in london all day
[20:06] <jcoxon> but its written
[20:06] <jcoxon> just needs cleaning up, page setting etc
[20:07] <edwardmoore> ooh cool
[20:07] <jcoxon> add a few graphs
[20:08] <jcoxon> keen for a sunday launch?
[20:08] <edwardmoore> this coming sunday?
[20:09] <jcoxon> yeah
[20:09] <jcoxon> though weather isn't good
[20:09] <edwardmoore> absolutelly
[20:09] <edwardmoore> should be an awesome weekend
[20:09] <jcoxon> well i'll see how payload building goes
[20:10] <jcoxon> we can decide later in the week
[20:10] <jcoxon> though if we go i reckon 1kg balloon
[20:10] <edwardmoore> are you changing anything mechanical?
[20:10] <jcoxon> slight overfill
[20:10] <jcoxon> edwardmoore, nope
[20:10] <jcoxon> all software changes
[20:10] <edwardmoore> if you go for a 1kg balloon, you could do a decent altitude shot maybe?
[20:11] <edwardmoore> shoot for a 1kg total lift from the balloon maybe
[20:11] <jcoxon> yeah, but perhaps descent altitude out of coincidence
[20:11] <jcoxon> if i can get some spin rate figures from the compass
[20:12] <jcoxon> we could work out a paranoramic view sequence
[20:12] <jcoxon> say at 60,000ft
[20:12] <edwardmoore> i mean it'd be nice to get a 30km-er :)
[20:12] <jcoxon> yeah
[20:12] <jcoxon> of course
[20:12] <jcoxon> we know the system works
[20:12] <edwardmoore> maybe a panoramic sequence every 10,000ft?
[20:12] <jcoxon> yeah
[20:12] <jcoxon> have it take regular pics up to then
[20:13] <jcoxon> then click,click,click
[20:13] <edwardmoore> the picture quality from the olympus is nice, so this could be awesome
[20:13] <jcoxon> such a difference from a high quality camera
[20:13] <jcoxon> leave the upward off
[20:13] <jcoxon> camera that is
[20:13] <edwardmoore> yeah it's just so much sharper
[20:13] <edwardmoore> *excited*
[20:13] <jcoxon> best to focus on the mission
[20:14] <edwardmoore> so what's the mission brief/objective for sunday?
[20:14] <edwardmoore> panorama?
[20:14] <jcoxon> 1) compass working an recording
[20:14] <jcoxon> 2) panorama every 10,000ft
[20:14] <edwardmoore> awesome
[20:15] <edwardmoore> brb
[20:18] <edwardmoore> bk
[20:21] <jcoxon> just updated the wik
[20:21] <jcoxon> i
[20:21] <edwardmoore> Neo-office is dire. i'm being forced to use it currently and it's no fun
[20:22] <jcoxon> not fun at all
[20:33] <edwardmoore> were you successful in london?
[20:34] <jcoxon> yup
[20:34] <jcoxon> london was good
[20:34] <jcoxon> right i'll bbl
[20:35] <edwardmoore> h'ok cya
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[21:24] <edwardmoore> hi mc-
[21:29] <mc-> hi, how's it going?
[21:29] <mc-> I hear my payload got chopped yesterday
[21:31] <edwardmoore> mmm yeah sorry about that
[21:31] <edwardmoore> the scales died
[21:31] <edwardmoore> and so the weight we used to measure balloon lift was too light
[21:31] <edwardmoore> it only got pegV on its own to 10km
[21:35] <mc-> It all adds to the group's experience
[21:37] <edwardmoore> hope so. was a shame tho. Heart skipped a bit when steve (who was holding your payload at the bottom of the train) just said 'it's not gonna take off as it stands...'
[21:40] <mc-> I haven't managed to find my estes rocket kit in the garage, can I buy motors on ebay?
[21:40] <mc-> is it legal?
[21:41] <edwardmoore> wouldn't know I'm afraid
[21:48] <mc-> do you think an estes motor would light at -60C?
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[23:46] <Laurenceb> Hi all
[23:46] <Laurenceb> nice shots jcoxon
[23:47] <Laurenceb> I should get a better camera, did you get any video?
[23:47] <edwardmoore> the video camera was pulled last minute
[23:47] <Laurenceb> :(
[23:47] <edwardmoore> it's amazing the difference that a 'decent' compact makes
[23:47] <Laurenceb> like the panorama idea
[23:47] <edwardmoore> proper glass, better metering etc
[23:48] <Laurenceb> but the camera wobbles up and down
[23:48] <Laurenceb> as well as around
[23:48] <Laurenceb> see the mihab3 video
[23:48] <edwardmoore> that one was particulary unstable
[23:48] <Laurenceb> It might be best just to do a birst of shots
[23:49] <Laurenceb> true
[23:49] <edwardmoore> i think because of the chaotic effect of having lots of payloads strapped together
[23:49] <Laurenceb> yes, chaotic pendulum
[23:49] <edwardmoore> subsequent ones, and internet vids, seem a lot more stable
[23:50] <Laurenceb> ideally youd have a rate gyro and compass
[23:50] <Laurenceb> and a kalman filter
[23:50] <edwardmoore> the compass is sufficient for this, providing its bandwidth is up to the job which i guess it should be
[23:51] <Laurenceb> I havent really thought about it, but with a model of the coiled spring effect of the payload line
[23:51] <Laurenceb> you should be able to code some filter
[23:51] <edwardmoore> we only want to get the camera pointing in the right place, +/- 10 degrees
[23:51] <Laurenceb> that predicts where its pointing
[23:52] <Laurenceb> yes, but its wobbling up and down, which mucks up the heading
[23:52] <Laurenceb> and you have the lag from the camera
[23:52] <Laurenceb> ie it doesnt take a photos straight away
[23:52] <edwardmoore> well i'm not convinced there's much up/down wobble
[23:53] <Laurenceb> fine if you want to know where its pointing, but to take photos in a certain direction, harrder
[23:53] <edwardmoore> and the spin and lag are pretty small compared to the spin rate
[23:53] <Laurenceb> guess it depends on the camera
[23:53] <Laurenceb> what would you extimate for a high end cam?
[23:53] <edwardmoore> this one is pretty good
[23:54] <edwardmoore> 0.1-0.2 secs?
[23:54] <Laurenceb> not bad
[23:54] <Laurenceb> what uis it?
[23:54] <Laurenceb> -is
[23:54] <edwardmoore> olympus something or other
[23:54] <edwardmoore> 3.2Mp
[23:54] <Laurenceb> I was looking at currys, quite cheap
[23:54] <edwardmoore> but high end in its day
[23:54] <edwardmoore> good hardware
[23:55] <Laurenceb> currys have premier cameras for £45
[23:55] <Laurenceb> 6mp
[23:55] <edwardmoore> not bad
[23:55] <edwardmoore> although i think the glass makes all the difference with these things
[23:55] <Laurenceb> electronics probably not bad, but worry about the optics
[23:56] <Laurenceb> the camera on mihab3 was premier, had problems with exposure control
[23:56] <Laurenceb> hopoefully they've improved the software on these more recent ones
[23:57] <Laurenceb> I might get one for ultrahab, they are very lightweight
[23:57] <Laurenceb> 80grams
[23:58] <edwardmoore> wow, that's not bad
[23:58] <Laurenceb> yes, and the price beats ebay
[23:58] <edwardmoore> right i must be off
[23:58] <edwardmoore> cya
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[23:58] <Laurenceb> cya
[23:59] <Laurenceb> anybody still alive on here?
[00:00] --- Mon Apr 30 2007