highaltitude.log.20070507

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[19:50] <jcoxon> evening rocketboy
[19:51] <rocketboy> hi jcoxon
[19:52] <rocketboy> what camera did you end up using for peg V? - the web page/wiki don't seem to agree
[19:52] <jcoxon> hehe
[19:52] <jcoxon> it was the olympus
[19:53] <jcoxon> facing sideways
[19:53] <jcoxon> i took the premier off at the last minute
[19:54] <rocketboy> ah - just been looking at the various flights for different cams - to see which I like the most
[19:54] <rocketboy> I think the Prem ds-3080 was the best for your flights
[19:55] <rocketboy> not sure what laurence ended up using - seems to be about the same
[19:55] <jcoxon> hmmmm on which flight?
[19:55] <rocketboy> mihab 2
[19:56] <jcoxon> yeah
[19:56] <jcoxon> they are cheap and cheerful
[19:56] <jcoxon> very light
[19:58] <jcoxon> that said i like my olympus i have now
[19:58] <jcoxon> works well
[19:58] <rocketboy> humm - seems a bit sensitive to motion blurr
[19:59] <jcoxon> i'm thinking thats a matter of settings
[19:59] <jcoxon> shall have to see
[19:59] <rocketboy> ah ok
[19:59] <rocketboy> the pics without MB are better than the prem
[20:00] <edwardmoore> ji guys
[20:00] <rocketboy> I just got the feeling that overall the prem seemed better for habing
[20:00] <rocketboy> hi ed
[20:01] <edwardmoore> One day we'll get to the point where 'better' is less rules by cost
[20:01] <edwardmoore> also there was a think on hackaday today about hacking canon digicams
[20:01] <edwardmoore> writing your own firmware and scripts
[20:02] <jcoxon> rocketboy, oh yeah the premier for its price is your best bet
[20:02] <jcoxon> about ?30 off ebay
[20:02] <jcoxon> can't really beat it
[20:03] <edwardmoore> http://www.hackaday.com/2007/05/06/powershot-firmware-hacking/
[20:03] <edwardmoore> programming it to do photos then a minute of video or whatever should be fairly straightforward
[20:03] <edwardmoore> maybe even letting it be controlled more simply over usb
[20:07] <rocketboy> darn - there is just too much choice
[20:08] <edwardmoore> i'd really like to plonk a camera on a tilting servo so you could, say, do ground stills, horizon stills, video of the cut-down and so on
[20:08] <edwardmoore> it would mean being able to controll stills and video though
[20:09] <rocketboy> not too difficult
[20:09] <edwardmoore> it would give a lorra flexibility
[20:12] <edwardmoore> steve what's the name of the big guy/from oop north/did some of the qinetiq balloon stuff?
[20:13] <rocketboy> chris elbeck
[20:13] <edwardmoore> that's the one
[20:13] <edwardmoore> cheers
[20:13] <rocketboy> (might not be quite the spelling)
[20:13] <rocketboy> he knows his stuff on radio
[20:14] <edwardmoore> yeah sounds like it. he does mars telemetry doesn't he?
[20:14] <rocketboy> does it professionally
[20:14] <rocketboy> yep
[20:14] <edwardmoore> kane (the h-altitude attemp guy) had a diesel fire yesterday afternoon
[20:15] <rocketboy> wow - how?
[20:15] <edwardmoore> james macfarlane took a look, had a pump on the diesel pump, and it quirted diesel right into the open. the feed line was totally burnt through
[20:16] <edwardmoore> and the previous fire had burnt through the insulation on the +ve cable from the batt
[20:16] <rocketboy> nasty
[20:16] <edwardmoore> aswell as a load of other stuff
[20:16] <edwardmoore> all a bit of a mess
[20:16] <rocketboy> did anyone fly at all?
[20:16] <edwardmoore> nope not really
[20:17] <edwardmoore> did you catch david's hover attempt?
[20:17] <rocketboy> only a trial run in the tent
[20:17] <edwardmoore> well he had a full run
[20:17] <rocketboy> ???
[20:17] <edwardmoore> it wasn't so much a case of the control law not working as the control law not even happening at all
[20:18] <edwardmoore> smacked into the ground hard, lot some of his electronics, bent some chassis
[20:18] <rocketboy> ah - it complex stuff
[20:18] <edwardmoore> but nothing that can't be fixed for next time
[20:18] <edwardmoore> i've got a video if you want?
[20:19] <rocketboy> he said he was using a non PID control system - based on time domain analysis - I cant remember what he said it was though
[20:20] <edwardmoore> no it went over my head
[20:20] <rocketboy> have you got his email you can forward me?
[20:20] <edwardmoore> he and brendon dissappeared into a loacked tent all afternoon and c overed many sheets of a4 with complex maths
[20:20] <edwardmoore> all went over my head
[20:21] <edwardmoore> i think the law they designed was sound- it just never actually got a chance to work during the flight
[20:21] <rocketboy> control engineering = black art
[20:22] <edwardmoore> mmmm.... i think it's what i want to do too
[20:22] <edwardmoore> control and signal processing
[20:22] <edwardmoore> gonna have to get matey with laplace
[20:23] <rocketboy> yeah
[20:23] <edwardmoore> was nice to finally meet chris
[20:23] <edwardmoore> got my 4th year project sorted already :)
[20:24] <rocketboy> ???
[20:24] <edwardmoore> chris bishop
[20:25] <edwardmoore> he said he'd offer me as a 4th year project 9they have to be offered by staff to students) whatever we decide in the next 3 years would be a cool thing to do
[20:25] <edwardmoore> that 9 should be a (
[20:26] <edwardmoore> i've got a kalman filtered single axis IMU sort of working now
[20:26] <rocketboy> OK - I think a balloon launch into orbit should be challenging for you
[20:27] <edwardmoore> :)
[20:27] <edwardmoore> yeah just a lil bit
[20:27] <edwardmoore> if before then i can get an actively stabalised rocket working and refined to something suitable for a minimum diameter missile, it'll be awesome
[20:27] <edwardmoore> my temptation now is to make a sort of lunar lander type thing like david
[20:28] <edwardmoore> but perhaps a bit bigger as he was constantly fighting agasinst weight
[20:28] <edwardmoore> rattworks do an i90 that holds 120N of thrust for about 4 seconds which would be perfect
[20:31] <rocketboy> I think a Javtar based activly stabilied rocket is a good challenge
[20:31] <edwardmoore> it'd be sillily awesome
[20:31] <edwardmoore> really gotta get some knowhow between now and then though
[20:32] <jcoxon> right - gumstix now has gps
[20:32] <jcoxon> and accelerometers
[20:32] <edwardmoore> how are you finding the accelerometers james?
[20:32] <rocketboy> 2 axis?
[20:32] <jcoxon> 3 axis
[20:32] <edwardmoore> do you fancy doing a quick experiment?
[20:32] <rocketboy> wow
[20:32] <jcoxon> might be able to
[20:33] <jcoxon> i'm only reading them through userspace
[20:33] <edwardmoore> intergrate the accelerometer output twice to get you position
[20:33] <jcoxon> edwardmoore, i'm confused
[20:33] <edwardmoore> then just slide it along your desk in one direction and then back in the other and see if it tells you you're back where you started?
[20:34] <jcoxon> intergrate as in maths intergrate?
[20:34] <edwardmoore> yeah
[20:34] <jcoxon> cause i don't do maths
[20:34] <edwardmoore> but numerically- don't be scared
[20:34] Action: jcoxon has an A* in GCSE maths
[20:34] <edwardmoore> lets take the example of a rate gyro
[20:34] <edwardmoore> that outputs aV when it's doing a degrees/sec
[20:35] <edwardmoore> where 'a' is just a number
[20:35] <jcoxon> okay
[20:35] <edwardmoore> so, say, 2.5V when it's doing 0 degrees a sec. 3V when it's doing 10 degrees a sec. 2V when it's doing -10 degrees/sec
[20:35] <edwardmoore> oh by the way, '-' means negative :p
[20:36] <edwardmoore> so if you want to 'integrate' the rate output, you get the position
[20:36] <edwardmoore> and lets say you sample the gyro every second
[20:36] <edwardmoore> you start off in position 0
[20:37] <edwardmoore> then after 1 second you read your fyro which say's you're doing 2 degrees per second
[20:37] <edwardmoore> so you add that to the position (which is now 2)
[20:37] <edwardmoore> then they next second you read the gyro and it reckons you're doing 4 degrees per second, so you assume you've gone 4 degrees in the last second, so you add '4' to the possition
[20:38] <edwardmoore> then it reckons the next second you're doing -1 degrees per second, so you subtract 1 from the position
[20:38] <jcoxon> so i could write a little script
[20:38] <edwardmoore> basically you add all the rate inputs at a regular interval to get a position
[20:38] <jcoxon> that reads the numer
[20:38] <jcoxon> number
[20:38] <jcoxon> waits one second
[20:38] <jcoxon> reads it again, adds it to the fist
[20:38] <jcoxon> first*
[20:38] <edwardmoore> i'd do it at like 20hz to be reliable
[20:38] <jcoxon> and displays it
[20:38] <edwardmoore> 1hz is a bit slow, was just using it for clarity
[20:39] <jcoxon> that'll require some C
[20:39] <edwardmoore> lol, ok don't bother
[20:39] <edwardmoore> it's not a particularly useful experiemt, just pure interest
[20:39] <jcoxon> i'll write something
[20:39] <jcoxon> soon
[20:43] <jcoxon> so guys - a drop test soon?
[20:43] <edwardmoore> drop from what?
[20:45] <jcoxon> well we do have some helium
[20:46] <jcoxon> (rocketboy - i've just put a cheque in the post for you)
[20:47] <rocketboy> ta jcoxon
[20:48] <rocketboy> yep - i need to use the helium up by the ned of the month
[20:48] <rocketboy> I'm up for some more drop tests
[20:48] <rocketboy> ned = end
[20:49] <jcoxon> well this gumstix has accelerometers and a gps (though its alitte rubbish - its the juipter one)
[20:50] <rocketboy> as long as we can get the data we can post-process it later
[20:51] <jcoxon> i'll also set up the 868mhz module
[20:51] <edwardmoore> i'm just looking through one of the vids i took- it's a k-motor rocket of about 2 second burn, but you can still see the rocket just about if you go through frame by frame after the burn as finished. and bloody hell does it move. it's more like the motor is an initial cannon blast and the rest is pure momentum. amazing
[20:51] <rocketboy> OK I'll get a servo-snoop to you in a few days
[20:52] <jcoxon> okay cool - shall i intergrate them into our existing T shaped payload?
[20:52] <rocketboy> that would be best
[20:52] <jcoxon> i'm also thinking of rigging the premier "dead" camera i have for upward facing?
[20:52] <rocketboy> as a starting point
[20:52] <jcoxon> video the parafoil?
[20:53] <jcoxon> or too much weight
[20:53] <rocketboy> I don't think weight is a problem
[20:55] <rocketboy> when we got it to glide - it had quite a low descent rate
[20:56] <jcoxon> edwardmoore, are you free for say 2 hours sometime this week?
[20:56] <jcoxon> to fix up the payload?
[21:01] <edwardmoore> james... towards the end of the week, yes
[21:01] <jcoxon> cool
[21:01] <edwardmoore> bear in mind we can't use eng atm
[21:01] <jcoxon> we'll also have to wait for the servo snooper as well
[21:01] <jcoxon> i've got a set with tables :-D
[21:01] <edwardmoore> lol :)
[21:01] <edwardmoore> ok
[21:02] <jcoxon> so the payload will have - rc stuff, servo snooper, 3axis accelerometer, gps, 868mhz radio
[21:03] <edwardmoore> steve if you can find any sort of diagram of picture or anything relating to javtars, i'd love to see it. the internet is giving me grief
[21:05] <rocketboy> see http://www.fas.org/man/dod-101/sys/missile/docs/RocketBasics.htm
[21:08] <rocketboy> I think the word is actually jetavator or javator
[21:12] <edwardmoore> aaaaaaah
[21:12] <edwardmoore> ty
[21:16] <rocketboy> ha - just bagged 3 x premier DS6067s on ebay for £11.50 (but marked as niggly faults)
[21:16] <rocketboy> 6Mp
[21:17] <rocketboy> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130109612798
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[21:17] <msweeney> evenin' all
[21:17] <edwardmoore> hi msweeney
[21:18] <edwardmoore> you know about hybrid's, right?
[21:18] <rocketboy> hiya
[21:18] <msweeney> uh oh
[21:18] <msweeney> yes!
[21:18] <msweeney> anyone go to EARS this weekend?
[21:18] <edwardmoore> yes
[21:19] <rocketboy> breifly
[21:19] <msweeney> owt good?
[21:19] <edwardmoore> saturday evening was glorious
[21:19] <edwardmoore> the rest of it was a bit buggered by weather
[21:19] <msweeney> pity
[21:19] <edwardmoore> but there was a log procession of Ks and Ls on saturday
[21:19] <edwardmoore> long*
[21:20] <msweeney> ooh lovely. Anything larger?
[21:21] <edwardmoore> the huge black hybrid thing had a leak, unfortunatelly
[21:21] <msweeney> damian's monstrosity?
[21:21] <edwardmoore> bielzebub or whatever it's called
[21:21] <edwardmoore> yeah
[21:21] <msweeney> haha pity. You'd have seen it go oooooh, 12 feet
[21:21] <msweeney> it weighs as much as my car
[21:22] <msweeney> especially with their video payload
[21:22] <edwardmoore> damian was carrying it easily enough
[21:23] <msweeney> it goes about 3k with the video payload
[21:23] <rocketboy> it weight 30kg
[21:23] <rocketboy> weigh = weighs
[21:23] <msweeney> solid state sony cam, big old 12V battery packs
[21:23] <msweeney> bloody cool workhorse tho
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[21:23] <msweeney> oooh who's looking at jetavators?
[21:24] <edwardmoore> coolio
[21:24] <edwardmoore> me
[21:24] <msweeney> ooh what're you planning?
[21:24] <edwardmoore> but i have another question- if i want something like an I90 but with a seperate Nox bottle, is that do-able?
[21:24] <edwardmoore> rocket into space from a balloon
[21:24] <msweeney> groovy
[21:25] <msweeney> well, they're called monocoque hybrids, dont know if youve ever got your hands on one
[21:25] <edwardmoore> nope
[21:25] <msweeney> basically its a tube with a nozzle at one end, a grain inside and a plug on top of the grain
[21:25] <edwardmoore> uhuh
[21:26] <msweeney> the pressure of the NOx holds the plug down, nitrous squeals through the aperture, decomposes into oxygen and nitrogen, furiously burns out the nozzle and up
[21:26] <msweeney> so
[21:26] <msweeney> I assume you're asking if you can store the N2O outside of the hybrid?
[21:26] <edwardmoore> yup
[21:26] <edwardmoore> i don't really want a long thin stick for a motor
[21:27] <msweeney> well, with an I90, not easily
[21:27] <msweeney> but there are other options
[21:27] <msweeney> Hypertek, for instance
[21:27] <edwardmoore> from a layout point of view it would be much easier to have the grain as a sperate thing to the gas
[21:27] <msweeney> they have a more modular assembly, the grain and injectors are seperate to the screw on tank
[21:27] <rocketboy> what about the co-axial hybrids
[21:27] <msweeney> are you planningon
[21:27] <edwardmoore> what be they?
[21:28] <msweeney> rocketboy, coaxial?
[21:28] <msweeney> em, hypertek or coaxial?
[21:28] <edwardmoore> coaxial means cabling to me
[21:28] <edwardmoore> coaxial
[21:29] <rocketboy> the oxidiser tant surronds the combustion chanber - results in a stubby hybrid - also the combustion heats the oxidiser
[21:29] <rocketboy> tant = tank
[21:29] <edwardmoore> uhuh i'm with you
[21:30] <msweeney> entirely possible, but there aren't any in production
[21:30] <edwardmoore> what size is the orifice between the nox and the grain normally?
[21:30] <rocketboy> I think hypertech were experimanting with them
[21:30] <msweeney> making your own is fun, but complicated
[21:30] <msweeney> ours never left the ground
[21:31] <msweeney> what're you looking at jetavating?
[21:31] <edwardmoore> well eventually a K1200 or something
[21:31] <edwardmoore> not hybrid
[21:31] <edwardmoore> but that's a bit farther off
[21:31] <msweeney> there are easier ways to control exhaust flow, and rocket position
[21:31] <edwardmoore> i want a hybrid space-hopper first
[21:31] <msweeney> that would be tres cool
[21:32] <edwardmoore> the space hopper would be gimballing the whole engine
[21:32] <edwardmoore> which is why i don't want a 1m long engine tube
[21:32] <edwardmoore> something a little shorter and correspondingly easier to wiggle
[21:32] <msweeney> mhmm
[21:32] <msweeney> brb
[21:32] <edwardmoore> what size is the orifice between the combustion chamber and the nox tank for something that sorta size?
[21:32] <edwardmoore> ok
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[21:33] <rocketboy> what sorta size?
[21:33] <edwardmoore> for what sorry?
[21:34] <rocketboy> you said what size is the orifice between the combustion chamber and the nox tank for something that sorta size?
[21:34] <edwardmoore> oh, I90
[21:34] <edwardmoore> ish
[21:34] <rocketboy> probably about 2mm
[21:34] <edwardmoore> just ballpark
[21:34] <edwardmoore> ok that's fine
[21:34] <edwardmoore> as long as it's less then 1/8bsp that's a cool thing
[21:35] <rocketboy> I think the M hypertech was 6 x 2mm
[21:35] <edwardmoore> i have a 70bar 2/2 1/2bsp valve that might get to see some action
[21:35] <rocketboy> set up to produce a twisting jet
[21:35] <edwardmoore> ooh very smart
[21:35] <msweeney> tis
[21:36] <edwardmoore> and could you guys run me by the ignition sequnce?
[21:36] <msweeney> there's a nifty series of ball bearings in the M hyperteks, which the dutch people always manage to blow the things up with them
[21:36] <msweeney> sure
[21:36] <edwardmoore> and also if the reloads are anything special or just plain old poly-whatever?
[21:37] <msweeney> there's a plastic fill line goes through the nozzle, up through the grain into the bit which separates the grain from the nox
[21:37] <rocketboy> yeh the hypertechs have a fill stem which pushes a ball baring out of the way and by-passes the jets
[21:37] <msweeney> grains = anything
[21:37] <msweeney> (this is with monocoque btw)
[21:37] <edwardmoore> ok
[21:37] <rocketboy> anything that burns - ther was an infamous nan bread hybrid once
[21:37] <msweeney> so when the tank above the grain is full and you can see the gas escaping through the vent, stop filling
[21:38] <edwardmoore> where is the vent located?
[21:38] <msweeney> then, there's usually some sort of pyro ignition. I prefer to use GOx (gaseous OX) - you have a small fill line into the combustion chamber
[21:38] <msweeney> top of the motor tank
[21:38] <msweeney> forward closure
[21:38] <edwardmoore> so one sees the vapour when the liquid reaches that hight?
[21:39] <edwardmoore> cos i assume there's high pressure gaseous nox coming out as soon as you start filling
[21:39] <msweeney> so fill the chamber with O2, then hit the ignition - usually either a spark or an ignitor next to some PIC
[21:39] <edwardmoore> but you don't see the cloud untill the liquid reaches it?
[21:39] <rocketboy> the hypertechs have a thin tube which vents between the tank and the combustion chamber - you really need a diagram for some of this stuff
[21:39] <edwardmoore> PIC = pyrotechnic....
[21:39] <msweeney> that lights the GOX, burns through the plastic NOX fill line
[21:39] <msweeney> ignitor cord
[21:40] <msweeney> so NOX is now spilling into the combustion chamber
[21:40] <rocketboy> plastic igniter cord I think
[21:40] <msweeney> it hits the VERY hot O2
[21:40] <msweeney> decomposes into Oxygen and nitrogen
[21:40] <edwardmoore> ok... so the oxygen gets the thing started becuase the nox takea a fair bit of heat to get going?
[21:40] <msweeney> burns furiously with the plastic fuel grain
[21:40] <rocketboy> yep
[21:40] <msweeney> gets compressed cleverly by the geometry of the nozzle,
[21:41] <msweeney> emerges as a stream of hot gasses and flame
[21:41] <msweeney> every reaction has an equal and opposite reaction
[21:41] <rocketboy> some hybrids are started with pyrotechnic materials rather than GOX
[21:41] <msweeney> bing badda boom rocket goes up
[21:41] <edwardmoore> ok. so ignoring rules about flying with compressed gas bottles, could you use a 600g nox bottle like you'd by at the shop?
[21:41] <msweeney> yerp
[21:41] <edwardmoore> and an electronic valve
[21:41] <msweeney> so long as yuo can reliably control and monitor fill
[21:42] <edwardmoore> but you'd still need it to flow into something very hot...
[21:42] <msweeney> yep
[21:42] <rocketboy> I think that is why the bottles are vented - it avoids the regulation
[21:42] <msweeney> the hyperteks use a more complicated system for lighting, but its very clever and I like ti a lot
[21:42] <edwardmoore> yeah... i'm just wondering if a 'hopper' counts as flight
[21:43] <msweeney> worry about regs at the end ;)
[21:43] <edwardmoore> yep
[21:43] <edwardmoore> ok--- trybrids
[21:43] <msweeney> oooh
[21:43] <msweeney> i do like
[21:43] <msweeney> ok
[21:43] <msweeney> these are slightly trickier, but not that much
[21:43] <msweeney> they usually use a self pressurised third source - alcohol etc
[21:44] <msweeney> pressurised by having a mini tank with a small opening suspended inside the main NOx tank
[21:44] <edwardmoore> yep ok
[21:44] <msweeney> and there is a fill line inside the NOx fill line which has a slower burn rate
[21:44] <msweeney> so
[21:44] <edwardmoore> and why couldn't you just use alcohol and nox initially?
[21:44] <msweeney> you fill the alcohol before loading
[21:44] <msweeney> erm, freezing the alcohol?
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[21:45] <msweeney> tribrid filled as hybrid above
[21:46] <msweeney> so when the NOX fill line burns through, the alcohol release line (which is blocked with a slower burning stopper) doesn't release until the nox is well underway (like half a second in)
[21:46] <msweeney> the NOX (or at least the gas of it) pressurises the alcohol out into the chamber, where it joins the party
[21:46] <edwardmoore> so you could bake the solid grain redundant if you could pre-heat the chamber sufficiently?
[21:46] <edwardmoore> make*
[21:47] <msweeney> nooo
[21:47] <msweeney> solid grain (if yuo mean the plastic) is the fuel
[21:47] <msweeney> things that burn need an oxidiser and a fuel
[21:47] <edwardmoore> isn't the alcohol the fuel?
[21:47] <msweeney> ah, good point
[21:48] <msweeney> then it would be a hybrid
[21:48] <edwardmoore> yeah
[21:48] <msweeney> but yes, you cuold theoretically do that
[21:48] <edwardmoore> basically we've just got a biprop
[21:48] <edwardmoore> just need a way of getting the reaction going
[21:48] <msweeney> yep
[21:48] <msweeney> a whole other kettle of fish
[21:48] <edwardmoore> food for thought
[21:48] <msweeney> why not try methane? ;-)
[21:48] <msweeney> http://science.nasa.gov/headlines/y2007/04may_methaneblast.htm?list815581
[21:49] <edwardmoore> maybe you could just pre-burn the methane for a bit in atmospheric oxygen
[21:49] <edwardmoore> i've seen that :)
[21:49] <edwardmoore> this is why i'm asking questions!
[21:49] <msweeney> amazing, eh
[21:49] <edwardmoore> i would want the liquid methane and nox to have their own seperate channels around the combustion chamber
[21:50] <edwardmoore> and just burn methane in the combustion chamber with atmospheric oxygen
[21:50] <msweeney> regen cooling
[21:50] <msweeney> complicated++
[21:50] <msweeney> run, walk, sprint...what's the order again?
[21:50] <msweeney> ;-)
[21:50] <edwardmoore> that'll pre-heat the chamber and heat up the methane and nox
[21:50] <edwardmoore> hmmmmmm
[21:51] <edwardmoore> straight to sprint
[21:51] <msweeney> am just looking at my Alevel physics coursework
[21:51] <msweeney> haha!
[21:51] <edwardmoore> well, i like to think of it as parallel fast-walks
[21:51] <msweeney> I did rockets, predictably
[21:51] <msweeney> there's a bit in there about guidance
[21:51] <edwardmoore> lol
[21:51] <edwardmoore> i love the shockwaves in that nasa video
[21:51] <edwardmoore> amazingly beautiful
[21:51] <edwardmoore> but yeah, a biprop........
[21:52] <edwardmoore> that would make gimballing a lot easier
[21:52] <msweeney> <manuel>#i know nothing</manuel>
[21:52] <edwardmoore> just need a readily available source of liquid meth
[21:52] <edwardmoore> oh, i am overlooking something
[21:52] <msweeney> what course are you doing? just engineering
[21:52] <edwardmoore> what do you mean *just* :p
[21:53] <edwardmoore> can hybrids be throttled?
[21:53] <msweeney> well i mean just as in overall rather than specific
[21:53] <edwardmoore> i would imagine you might get some wierd pressure differencial things
[21:53] <edwardmoore> yeah overall
[21:53] <msweeney> as opposed to aero
[21:53] <edwardmoore> so i spent today being uninterested in crack propagation through rubber
[21:53] <msweeney> which branch are you interested in?
[21:53] <msweeney> heh
[21:54] <edwardmoore> control and signal processing... and dynamics
[21:54] <msweeney> I spent today uninterested in waves & vibrations...
[21:54] <msweeney> lovely jubbly
[21:54] <edwardmoore> ah yeah, mechanical vibrations turns me off too
[21:54] <edwardmoore> my eyes just glaze over with all these partial differentials
[21:54] <msweeney> I spent last summer doing weapon dynamics, am best friends with Mr. kalman and Mr. Monte carlo
[21:54] <edwardmoore> oh wow
[21:55] <edwardmoore> mr kalman is central to this project
[21:55] <msweeney> i can imagine
[21:55] <edwardmoore> mr monte carlo can wait untill i'm interested in where i'm going to land
[21:55] <edwardmoore> but mr kalman is key
[21:55] <edwardmoore> i've got a single axis inertial measurement unit running a kalman filter
[21:55] <msweeney> hard schizz, especially if you're attempting to learn it with A level maths like I was ;)
[21:56] <edwardmoore> but i ened to do a fair bit of optimisation to it
[21:56] <edwardmoore> yeah tell me about it
[21:56] <edwardmoore> they don't even do matrix calculus in the 4th year here
[21:56] <msweeney> mhmm. Most of the stuff I did was very easy stuff
[21:56] <msweeney> :| I have it next year
[21:56] <edwardmoore> the trouble is in order to 'optimise' it i really need to understand it
[21:57] <edwardmoore> oooh arse, i have a 10pm appointment
[21:57] <edwardmoore> thanks for all your help- will want to talk soon no doubt!
[21:57] <msweeney> np,
[21:57] <msweeney> are you a high class hooker or summat?
[21:57] <edwardmoore> oh btw- do you know a safeish way of measuring pressure at high tempt?
[21:57] <edwardmoore> basically combustion chambre pressure
[21:57] <msweeney> can you get radiation off it?
[21:57] <edwardmoore> yes it's true. i sell myself to the highest bidder
[21:57] <msweeney> (light?)
[21:58] <msweeney> oh combustion chamber
[21:58] <edwardmoore> light off what?
[21:58] <msweeney> i'm not sure
[21:58] <msweeney> will have a look
[21:58] <edwardmoore> awesome
[21:58] <edwardmoore> right cya later
[21:58] <msweeney> tra
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