highaltitude.log.20091207

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[07:44] <jcoxon> morning all
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[13:20] <Laurenceb> hi
[13:28] <juxta> evening Laurenceb
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[14:43] <Laurenceb_> www.xbow.com/Support/Support_pdf_files/Fusion_Filter_Algorithm.pdf
[14:43] <Laurenceb_> interesting stuff, they appear to have two filters, one for state one for errors
[14:44] <Laurenceb_> interesting that they talk about GPS latency
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[14:47] <SpeedEvil> Fuck.
[14:47] Action: SpeedEvil sighs.
[14:47] <SpeedEvil> Driving test today.
[14:47] <Laurenceb_> heh good luck
[14:48] <SpeedEvil> I get into the test shaking, and knackered, after fixing a stuck brake caliper causing the left front to overheat.
[14:48] <SpeedEvil> It diddn't get better from there.
[14:48] <Laurenceb_> oh you had the test
[14:49] <Laurenceb_> you had the test in your own car?
[14:50] <SpeedEvil> yes.
[14:54] <Laurenceb_> went badly?
[14:54] <SpeedEvil> Fail.
[14:57] <Laurenceb_> sucks
[14:58] <Laurenceb_> what did you fail on?
[14:58] <SpeedEvil> Driving.
[14:58] <SpeedEvil> The main bit was probably observation.
[14:58] <SpeedEvil> Nearly pulled out in front of a slow-moving car
[14:58] <SpeedEvil> Was feeling totally shit.
[14:59] <Laurenceb_> :(
[15:00] <SpeedEvil> yeah.
[15:00] <SpeedEvil> DSA is totally fucked. - website.
[15:00] <SpeedEvil> Next appointment for a test is 26 jan
[15:02] <Laurenceb_> how many have you had?
[15:04] <SpeedEvil> 3 or 4.
[15:04] <SpeedEvil> Problems scheduling enough driving lessons to get confident
[15:05] <Laurenceb_> thats not good :-/
[15:06] <Laurenceb_> do you find the number of faults has decreased?
[15:06] <SpeedEvil> no - today was highest
[15:06] <SpeedEvil> but yes - in general
[15:06] <SpeedEvil> Just feeling totally shit.
[15:07] <Laurenceb_> Cant you find someone to help you learn
[15:07] <Laurenceb_> maybe someone who recently passed - as they would be familiar with the test?
[15:12] <Laurenceb_> I mean theres safe driving and driving for the test
[15:12] <Laurenceb_> they pick up on some weird stuff sometimes
[15:14] <SpeedEvil> problem is I don't really know many of the neighbours. I hope to get something worked out soon though.
[16:13] Nick change: user_ -> n900evil
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[17:22] <rjharrison> evening all
[17:22] <rjharrison> Hows it going SpeedEvil
[17:23] <SpeedEvil> meh.
[17:23] <SpeedEvil> (02:47:36 PM) SpeedEvil: Driving test today.
[17:23] <SpeedEvil> (02:48:10 PM) SpeedEvil: I get into the test shaking, and knackered, after fixing a stuck brake caliper causing the left front to overheat.
[17:23] <SpeedEvil> (02:48:18 PM) SpeedEvil: It diddn't get better from there.
[17:23] <rjharrison> that bad
[17:23] <rjharrison> Oh dear
[17:23] <SpeedEvil> :/
[17:24] <rjharrison> So when's the next one
[17:24] <SpeedEvil> Dunno.
[17:25] <rjharrison> It seems unfortunate that you had to fix the caliper before the test
[17:25] <rjharrison> Was it your own car or the driving instructors
[17:25] <rjharrison> Or have you taught yourself to drive
[17:25] <rjharrison> I wonder if that is legal?
[17:25] <rjharrison> I guess you need a big garden
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[17:27] <rjharrison> I seem to have really bad indigestion atm
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[17:27] <rjharrison> Either that or a heart attack
[17:27] <rjharrison> :)
[17:27] <rjharrison> DanielRichman, are you not going to launch untill you have made the yagi
[17:28] <DanielRichman> rjharrison, depends on how fast I can build it
[17:28] <rjharrison> jcoxon seemed to think the wx was looking good for the w/e
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[17:28] <DanielRichman> was about to ask :P
[17:28] <DanielRichman> i will poke sbasuita
[17:28] <rjharrison> hey juxta how is HAB going down under
[17:29] Action: rjharrison watches DanielRichman poke sbasuita
[17:29] <sbasuita> :S
[17:30] <DanielRichman> sbasuita, supply opinion
[17:30] <DanielRichman> after all, procuring a yagi of some sort _was_ your responsibility
[17:30] <sbasuita> DanielRichman, if we can borrow a yagi then sure let's launch
[17:30] <rjharrison> Camb. will lend you one I'm sure
[17:30] <rjharrison> I assume your going to camb to launch
[17:30] <sbasuita> rjharrison, yes
[17:31] <rjharrison> You will need to let them know if you do plan to launch
[17:31] <rjharrison> on train on the way back from London ATM
[17:31] <rjharrison> Spent the day in Smokey
[17:31] <sbasuita> DanielRichman, we still need to order the parachute/helium
[17:31] <sbasuita> i mean balloon
[17:31] <sbasuita> not helium
[17:32] <rjharrison> If you launch from EARS steve will bring it with him
[17:32] <rjharrison> Once again notice would be good
[17:32] <rjharrison> Oooh shit we're pulling in to Wakefield Westgate
[17:32] <rjharrison> I get off here
[17:32] <rjharrison> ttfn
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[17:32] <DanielRichman> sbasuita, i see three problems
[17:33] <DanielRichman> 1) procurement of balloon & parachute. Within that there are a couple of issues
[17:33] <DanielRichman> - procurement of moneys
[17:33] <DanielRichman> - time taken to deliver
[17:33] <DanielRichman> 2) procurement of yagi, portable, base station style... ?
[17:33] <Laurenceb_> procurement of moneys
[17:33] <DanielRichman> 3) are we free this weekend?
[17:33] <Laurenceb_> you can buy it?
[17:34] <Laurenceb_> aha hence moneysuoermarket.com
[17:34] <Laurenceb_> I see not
[17:34] <DanielRichman> But money can be bought with other things
[17:34] <Laurenceb_> £10 for £5 ?
[17:34] <DanielRichman> for example, I could sell your soul for money?
[17:34] <DanielRichman> in a roundabout way..
[17:35] <DanielRichman> Besides, I did say "procure" - via a slightly illegal visit to a bank vault money can be procured
[17:35] <sbasuita> Calm down dudes
[17:35] <sbasuita> Just get receipts and give to school
[17:35] <sbasuita> so that's the first sorted
[17:35] <Laurenceb_> lulz
[17:35] <DanielRichman> sbasuita, so who's gonna buffer that payment?
[17:35] <DanielRichman> someone has to buy it first
[17:35] <Laurenceb_> http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?catname=45C+Discharge&idCategory=337&ParentCat=85
[17:35] <sbasuita> yagi we can build or borrow from cambridge
[17:36] <DanielRichman> and I don't think alex is happy about that
[17:36] <Laurenceb_> 45C thats raving bonkers
[17:36] <sbasuita> DanielRichman, alex can rage on longstaff then
[17:36] <sbasuita> Laurenceb_, mind blown
[17:36] <Laurenceb_> http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=10090&Product_Name=Polyquest_XF_4400mAh_6S_45C_-_90C_Lipoly_
[17:36] <DanielRichman> sbasuita, go grow some empathy
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[17:36] <Laurenceb_> is that classed as explosives?
[17:37] <Laurenceb_> you could discharge it in 40 seconds
[17:37] <sbasuita> oh wow
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[17:37] <Laurenceb_> 9Kw power output
[17:38] <Laurenceb_> thats 12 horsepower
[17:38] <Laurenceb_> in 750grams
[17:38] <sbasuita> apparently that would supply 1 to 3 'american households'
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[18:04] <MikeMc> evening
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[18:06] <jcoxon> evening all
[18:06] <MikeMc> evening
[18:08] <jcoxon> hey MikeMc
[18:08] <jcoxon> did you get the pcb?
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[18:48] <MikeMc> Hey jcoxon
[18:49] <MikeMc> Yes I did thanks
[18:49] <jcoxon> hey MikeMc
[18:49] <jcoxon> good good
[18:51] <jcoxon> hows the payload coming on?
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[19:59] Action: jcoxon is calibrating his ballast sensor
[20:00] Action: DanielRichman is setting up a HTTP proxy since he's REALLY bored with the school's internet filter
[20:01] <jcoxon> hehe
[20:03] <DanielRichman> Oooh, apache is nice. You can have it request http basic authentication before it lets you use the forward proxy
[20:03] <DanielRichman> tastey.
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[20:10] <jcoxon> hmmm this tank measuring works slightly roughly
[20:10] <jcoxon> but it definitely tells you if its empty
[20:12] <jcoxon> :-p
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[20:30] <Laurenceb_> anyone know the name of the company hallams working for?
[20:31] Action: Laurenceb_ is looking up if they were shortlisted for more funding in Obamas energy funding thingy
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[20:45] <Laurenceb_> http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7572&Product_Name=ZIPPY_600mAh_20C_single_cell__
[20:45] <Laurenceb_> Pretty good price/performance
[20:46] Action: Laurenceb_ wonders how practical a DIY "tesla" is
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[20:48] <Laurenceb_> probably in the region of £10K
[20:48] <rjharrison_> evening all
[20:49] <rjharrison_> I did manage to get off at wakefiled but only just
[20:49] <rjharrison_> wakefield
[20:49] <rjharrison_> jcoxon is the wx still good for the w/e
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[20:51] <rjharrison_> i'm getting the silent treatment :)
[20:51] <rjharrison_> Evening RocketBoy
[20:54] <jcoxon> hey rjharrison_
[20:54] <rjharrison_> Hi
[20:54] <rjharrison_> How are you doing
[20:54] <rjharrison_> did the surgical sprit test work?
[20:55] <rjharrison_> spirit
[20:55] <jcoxon> yeah
[20:55] <rjharrison_> cool
[20:55] <jcoxon> just been calibrating it
[20:55] <jcoxon> so have it now working out percentage dumps
[20:55] <jcoxon> dumped*
[20:55] <rjharrison_> awsume
[20:55] <rjharrison_> sounds fun
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[20:59] <AlexBreton> hello all
[20:59] <AlexBreton> located a US military surplus balloon for sale
[20:59] <AlexBreton> Kaysam, 3kg lift
[21:00] <AlexBreton> reckon it's worth a buy?
[21:00] <jcoxon> ebay?
[21:00] <AlexBreton> (also-do balloons get worse with age?)
[21:00] <AlexBreton> yes
[21:00] <jcoxon> indeed they do
[21:00] <AlexBreton> :/
[21:00] <AlexBreton> how so?
[21:00] <jcoxon> UV light exposure
[21:00] <jcoxon> i'd really go with a new balloon
[21:00] <AlexBreton> just UV ?
[21:01] <AlexBreton> what if it's stored in a dark place?
[21:01] <ms7821> Laurenceb_: nothing like £10k
[21:01] <jcoxon> get it from randomaerospace if i was you
[21:01] <jcoxon> new balloons are so much better
[21:01] <ms7821> there's quite a community if you're interested
[21:01] <AlexBreton> yeah but a 3kg balloon would get very high indeed
[21:01] <AlexBreton> with our payload
[21:01] <rjharrison_> AlexBreton good advice use new. You don't want it to pop at 10k
[21:01] <jcoxon> if it was new
[21:02] <rjharrison_> Not for the sake of 10 or 20 quid
[21:02] <sbasuita> AlexBreton, I don't trust it mate
[21:02] <AlexBreton> ok fair
[21:02] <jcoxon> if you look at the altitude levels of the past we only broke 30km when we started using new balloons
[21:02] <AlexBreton> well how big?
[21:02] <AlexBreton> anything close to 3kg?
[21:02] <rjharrison_> Some of the guys on here have tried it but they have a very short shelf life like 6 - 8 months
[21:03] <rjharrison_> Often the old ones have been around for years
[21:03] <AlexBreton> even sealed in packaging?
[21:03] <RocketBoy> seriously - don't think about a 3kg payload streight off in the UK
[21:03] <rjharrison_> Yep even sealed
[21:03] <rjharrison_> AlexBreton lots of good advice here
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[21:04] <AlexBreton> OK
[21:04] <AlexBreton> thanks
[21:04] <sbasuita> AlexBreton, i was thinking more 1.2kg
[21:04] <rjharrison_> 1.2 1.5 the price is ~60 quid I'd go for 1.2 /1.5 depending on your payload
[21:04] <rjharrison_> I got 35k on 1.2kg
[21:05] <AlexBreton> sbasuita, what's the verdict on the yagi?
[21:05] <rjharrison_> This w/e is out I think looking at wundergorund
[21:05] <sbasuita> AlexBreton, dan is building one anyway but it's not essential because we can always borrow one from cambridge
[21:05] <rjharrison_> Might be worth checking CUSF
[21:05] <sbasuita> AlexBreton, really waiting on weather now
[21:05] <AlexBreton> right so launch this weekend?
[21:05] <sbasuita> How do you guys pick a future date?
[21:05] <rjharrison_> Looks like were moving to better wx in the comming weeks though
[21:06] <rjharrison_> Anything more than 7 days is guestimate
[21:06] <AlexBreton> OK gonna log on to ecmwf
[21:06] <AlexBreton> check the weather
[21:06] <rjharrison_> but the whole JS looks to be improving in the next 7 -14 days
[21:06] <AlexBreton> rjharrison, not with a supercomputer at hand ;-)
[21:07] <sbasuita> Is this usable? http://www.srcf.ucam.org/~cuspaceflight/hourly-predictions/
[21:09] <jcoxon> yes but with a pinch of salt
[21:09] <jcoxon> its fairly alpha
[21:09] <sbasuita> jcoxon, it's very nice though :)
[21:09] <jcoxon> yeah thank rjw57 for it
[21:12] <AlexBreton> sbasuita, saturday gives us a NNE wind
[21:12] <AlexBreton> which blows the balloon towards berkshire/wiltshire
[21:13] <sbasuita> AlexBreton, we still haven't got a balloon or chute
[21:13] <AlexBreton> well let's order one
[21:13] <AlexBreton> I'm not footing the bill this time
[21:13] <AlexBreton> unless the school can pay back what they already owe
[21:13] <sbasuita> lol k i notgun ;P
[21:15] <AlexBreton> typical
[21:15] <sbasuita> So... http://randomsolutions.co.uk/top.htm
[21:15] <sbasuita> 1200g balloon = 60 quid
[21:16] <sbasuita> 24" chute = 9 quid
[21:16] <AlexBreton> ouch
[21:16] <sbasuita> AlexBreton, how much cord?
[21:16] <sbasuita> its 15p a metre
[21:16] <AlexBreton> errr
[21:16] <AlexBreton> 1.5m?
[21:16] <AlexBreton> 1m?
[21:16] <sbasuita> AlexBreton, 20m? gives us tonnes of rope for mucking about with
[21:16] <AlexBreton> how about no for an answer
[21:17] <AlexBreton> keep bills to a mimimum
[21:17] <AlexBreton> 3m
[21:17] <AlexBreton> in case we mess up
[21:17] <sbasuita> AlexBreton, i don't think 3m will be enough
[21:17] <AlexBreton> what the hell do you have in mind for 20m?
[21:17] <sbasuita> AlexBreton, 20m is still only 3 quid
[21:17] <AlexBreton> 3m is only 45p
[21:17] <RocketBoy> if you order a balloon and a chute I'll throw in 20m of cord for free
[21:17] <AlexBreton> thanks
[21:18] <AlexBreton> that's solved it
[21:18] <sbasuita> cheers RocketBoy :D
[21:18] <sbasuita> AlexBreton, btw we didn't have any english right?
[21:18] <RocketBoy> if you are down as UKHAS memebers you get a discount as well
[21:18] <AlexBreton> dunno, handed my book in
[21:18] <sbasuita> AlexBreton, same
[21:18] <sbasuita> RocketBoy, how much is that?
[21:19] <AlexBreton> can we get a small discount for your logo and link on the blog?
[21:19] <RocketBoy> not a huge amount - you get it at cost (I'll have to work it out - normally about 10 - 15%)
[21:20] <AlexBreton> ok don't worry then
[21:20] <AlexBreton> the free cord is kind enough
[21:32] <MikeMc> evening all
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[21:38] <RocketBoy> AlexBreton: I just checked UKHAS pricing - paypal "sales (at) randomsolutions(dot) co (dot) uk" £62 and I'll supply the 1200g, 24" and 20m cord.
[21:39] <AlexBreton> thanks
[21:39] <AlexBreton> we'll get the order in this week
[21:41] <russss> I got my USRP daughterboard finally
[21:41] <russss> but I need to build an aerial.
[21:42] <Laurenceb_> neat
[21:42] <Laurenceb_> what frequency?
[21:42] <russss> it's 50-900MHz, and I also have an 850-2.4GHz card
[21:43] <Laurenceb_> ah with the big canned TV tuner
[21:43] Action: russss sees if he can pick anything up with a bit of wire poked into it
[21:43] <Laurenceb_> how does that work? do you get an IF out?
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[21:43] <russss> I didn't realise it had an F connector when all the other boards have an SMA
[21:43] Action: Laurenceb_ didnt think it looked like a brilliant solution, but maybe it is
[21:44] <russss> well the USRP handles the tuning
[21:44] <russss> so you just ask it for a specific frequency and it handles everything else
[21:45] <russss> I'm massively under-using it but I'll sell it to the hackspace eventually
[21:46] <russss> it's nice because you can sample any frequency band at the bandwidth of the USB bus. So it's a good multi-purpose thing to fiddle with
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[22:00] <Laurenceb_> interesting - I was looking at the TV tuner ICs
[22:03] <jcoxon> Laurenceb_, i've calibrated the sensor
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[22:04] <russss> the tuner in question appears to be this one: http://www.comsec.com/usrp/microtune/4937-DI5-3x8899-2.pdf
[22:04] <russss> designed for cable modems
[22:06] <Laurenceb_> interesting
[22:07] <Laurenceb_> yeah some of the maxim cable modem stuff looks interesting
[22:07] <Laurenceb_> jcoxon: what do the results look like then?
[22:07] <jcoxon> yeah not too bad
[22:08] <Laurenceb_> are you processing it to get out a %age?
[22:08] <jcoxon> 0ml = 185, 100ml = 69, 200ml =52, 300ml = 39, 400ml = 30 and 500ml = 18
[22:08] <jcoxon> i've plotted them and fitted a curve
[22:08] <jcoxon> and so have a nice equation to convert
[22:09] <Laurenceb_> nice
[22:09] <jcoxon> it isn't that accurate :-p
[22:10] <Laurenceb_> convert quite fast - average a lot, then convert with an equation
[22:10] <jcoxon> i'm sampling 100 times
[22:10] <Laurenceb_> you can use gnuplot to fit to an exponential decay
[22:10] <Laurenceb_> cool
[22:10] <Laurenceb_> yeah that sounds sensible
[22:10] <Laurenceb_> and taking the difference between led on and off?
[22:10] <jcoxon> i found a log regression fitted better
[22:11] <Laurenceb_> let me guess you used that thig on hackaday?
[22:12] <Laurenceb_> - well if you are going in the oposite direction exp -> log (or ln)
[22:12] <jcoxon> yup led of and on
[22:12] <jcoxon> and used math.h to get exp
[22:13] <jcoxon> what i'm doing is every 5 loops of my code pausing the pump to let the sensor settle
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[22:13] <edmoore> that's like a pre-enlightenment FIR filter
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[22:15] <Laurenceb_> turning the pump on/off?
[22:16] <jcoxon> yes
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[22:16] <Laurenceb_> - edmoore
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[22:18] <edmoore> Laurenceb_: yes
[22:19] Nick change: Laurenceb_ -> Laurenceb
[22:19] <Laurenceb> edmoore: attitude filtering - is it sensible to have two filters, one basic - no bias terms in the state vector, and running as fast as possible
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[22:20] <Laurenceb> and one slower, taking multiple datapoints from the faster filter and computing bias terms ect
[22:20] Action: Laurenceb was reading through some commercial IMU documentation
[22:20] <edmoore> if you've not got the computing power to track the bias in the state vector, maybe
[22:20] <edmoore> but it's not that expensive a thing to do
[22:21] <Laurenceb> yeah - they were going mental and having tons of nonlinearity terms etc
[22:21] <edmoore> each to their own
[22:21] <edmoore> at some point you have to admit defeat and go for a particle filter
[22:22] <Laurenceb> yeah I'm not convinced - you get to a point where additional complexity just fails to adequately model things
[22:22] <edmoore> or some sort flavour of sequential montecarlo, at any rate
[22:22] <Laurenceb> yeah, but the comp power goes up a lot
[22:23] Action: Laurenceb has been working on a rocket spin up system
[22:23] <Laurenceb> good news - really simple and cheap way to do 100km at the very least
[22:23] <Laurenceb> bad news - needs a pretty good IMU onboard
[22:24] <edmoore> which is non trivial in a rocket
[22:24] <edmoore> might have to look at going back to DIY FOGs
[22:24] <Laurenceb> yeah its very feasible
[22:24] <Laurenceb> but I wasnt clear sorry
[22:24] <Laurenceb> IMU stays on the launcher
[22:24] <edmoore> oh
[22:24] <Laurenceb> rocket is dumb
[22:25] <Laurenceb> brushless motor and a CF tube space frame construction
[22:25] <Laurenceb> I need to do some CAD but basically it dangles off the bottom and has a single gyro
[22:25] <Laurenceb> - bottom of the balloon
[22:25] Action: Laurenceb looks for some images to illustrate
[22:26] <Laurenceb> http://img502.imageshack.us/i/haleomgj7.jpg/
[22:26] <Laurenceb> middle section of the scope in the background
[22:27] <Laurenceb> that design made with CF tubes
[22:28] <Laurenceb> three or so little rollers embedded into the inner face of the top "ring" to contact the rocket, and a brushless motor in the base to spin it up
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[22:29] <Laurenceb> also similar design used on hubble http://content.answers.com/main/content/img/McGrawHill/Encyclopedia/images/CE757724FG0010.gif
[22:31] <jcoxon> okay - i need some help with some C++ compiling
[22:32] <edmoore> don't ask to ask, just ask
[22:32] <edmoore> or whatever it is they say
[22:32] <jcoxon> i'm warning people
[22:32] <jcoxon> hehe
[22:32] <jcoxon> actually its pretty simple
[22:33] <jcoxon> basically i've compile the individual cpp into .o
[22:33] <jcoxon> and then used g++ to link them together
[22:33] <jcoxon> but the binary it produces just opens and closes
[22:34] <ms7821> tried under gdb?
[22:35] <jcoxon> the silly thing is that i've done it before
[22:35] <jcoxon> but i'm going to move it to my G4 so will need to recompile
[22:35] <jcoxon> just can't remember teh command
[22:36] <jcoxon> does it matter with g++ -o test.out x.o y.o which order the .o files go in?
[22:38] <ms7821> only for dependency resolution
[22:38] <ms7821> if it compiles, no
[22:39] <Laurenceb> http://en.wikipedia.org/wiki/Automotive_night_vision
[22:39] Action: Laurenceb buys a Cadillac Deville
[22:40] <SpeedEvil> I have automotive night vision.
[22:40] <SpeedEvil> they're called headlights.
[22:40] <Laurenceb> heh
[22:41] <Laurenceb> pedestrian detection feature alerted the driver with an audio warning and visually enclosed the pedestrian in a box on the display which was presented via head-up display
[22:41] <Laurenceb> its a car not a freaking attack copter
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[22:42] <edmoore> night all
[22:42] <Laurenceb> cya
[22:43] Nick change: Laurenceb -> arduino_blofeld
[22:43] <SpeedEvil> niht
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[22:44] <ms7821> heh b10fe1d is gonna be my next magic constant
[22:44] <arduino_blofeld> freaking arduinos with freaking flashing freaking leds on their freaking IO pins
[22:44] <arduino_blofeld> freaking ethernet board with freaking twitter feed
[22:45] Nick change: arduino_blofeld -> Laurenceb
[22:45] <jcoxon> yay for arduino
[22:46] <MikeMc> :)
[22:46] <SpeedEvil> '"The Ten Coolest Things About New Jersey" is simply ten seconds of silence. Jimmy Pop said that some other members of Bloodhound Gang needed to have that track explained to them.'
[22:49] Action: Laurenceb is wondering how badly brushless motors screw with magnetometers
[22:50] <Laurenceb> looking at some numbers its seems not a lot at all
[22:50] <SpeedEvil> On average, not at all.
[22:50] <SpeedEvil> :)
[22:50] <SpeedEvil> magnetometers also seem to be coming down in price
[22:50] <Laurenceb> one you get to a few time the runner diameter away
[22:50] <SpeedEvil> which is nice
[22:50] <Laurenceb> it goes down with 1/d^4
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[22:50] <Laurenceb> which is very nice
[22:50] <SpeedEvil> Don't think so
[22:51] <Laurenceb> the magnets are dipoles
[22:51] <Laurenceb> but you dont have bare magnets
[22:51] <Laurenceb> you're looking at second order effects
[22:51] <Laurenceb> or rather first order effects
[22:52] <Laurenceb> due to the difference in distance from the magno to the magnet centers as you move around the motor
[22:53] <Laurenceb> http://www.sparkfun.com/commerce/product_info.php?products_id=244 thats still the best thing I've seen
[22:54] <Laurenceb> nice low power and good performace
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[22:57] Nick change: user_ -> n920evil
[22:59] <n920evil> stupid dsl
[23:02] <n920evil> to restate
[23:02] <RocketBoy> nights
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[23:03] <n920evil> don't think so
[23:03] <n920evil> that's for a bipolar field
[23:03] <n920evil> outrummer will be octsadecapolar or something
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[23:07] Nick change: SpeedEvil1 -> SpeedEvil
[23:10] <SpeedEvil> http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1967220&k=HMC5843 - cheap magnetometers. Which are nice
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[23:11] <Laurenceb> ah yeah I remember that one
[23:11] <Laurenceb> anyway gtg, cya
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[23:11] <SpeedEvil> wave
[23:12] <jcoxon> SpeedEvil, sorry to hear about the driving test
[23:12] <SpeedEvil> thanks.
[23:12] <SpeedEvil> meh.
[23:12] <SpeedEvil> At least the brake diddn't bind dangerously.
[23:12] <SpeedEvil> I now need to prop it up, pull the caliper off and strip it.
[23:12] <SpeedEvil> Which is annoying
[23:14] <jcoxon> sounds it
[23:14] <jiffe98> so up at altitude with power generation from the circuitry, is it more likely to have overheating problems in the low pressure atmosphere?
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[23:16] <SpeedEvil> conduction is actually more or less unaffected down to very low pressures
[23:17] <jcoxon> jiffe98, from experience we haven't had any problems
[23:20] <SpeedEvil> how much power?
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[23:29] <jiffe98> big thing would probably be the transmitter output which is 1 second every 2 minutes, that is 300mW, for the most part I think the power output should be really low
[23:29] <jiffe98> I guess I might just have to do the math on how much this this will conduct/radiate
[23:30] <SpeedEvil> that's essentially not going to be a problem
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[00:00] --- Tue Dec 8 2009