highaltitude.log.20070326

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[13:19] <Laurenceb> Hi all
[13:20] <Laurenceb> I've got a new forward extropotation technique working; it uses the current rudder position and the aerodynamic damping effects of the glider from tuning the simulation
[13:21] <Laurenceb> extropolation.. oh my spelling is poor
[13:22] <Laurenceb> very very cool, reaches +-15 degree range in 2 seconds from 90 degrees and stays there, only problem is plane cant turn that quickly, need to put limits on simulation
[13:28] <Laurenceb> up on wiki
[13:34] <defy_> hey Laurenceb :)
[13:34] <Laurenceb> Hi there
[13:35] <Laurenceb> this is so cool
[13:35] <Laurenceb> it seems easier to tune as well, less picky in the values of P,I, and D
[13:35] <defy_> hows it going
[13:35] <Laurenceb> very good thanx :-)
[13:36] <Laurenceb> only problem is how I'm going to test this thing, its going to fly away!
[13:37] <Laurenceb> all thanks to rocketboy, he came up with the idea for this sort of forward extropolation
[13:37] <defy_> I dont know what that is, but sounds neat :P
[13:37] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:mihab:forward_extropolation.png?cache=cache
[13:38] <Laurenceb> basically we try and get around the gps lag problem by estimating from the previous headings and what the plane has been doing
[13:38] <defy_> I went out and dropped my glider a few times from 500 feet, waypoint tracking works great
[13:39] <Laurenceb> cool
[13:39] <Laurenceb> this is using the thermopile center point shifting?
[13:39] <Laurenceb> ie making it bank to turn
[13:39] <defy_> I could hit about 4 targets within 100 feet of each other before landing on beach
[13:39] <defy_> yea exactly
[13:40] <Laurenceb> i've got a nice hill but there are a load of houses at the bottom
[13:40] <defy_> I also got the signal loss detection working sweet, so if my transmitter turns off or loses signal, autopilot kicks in
[13:40] <defy_> true, yea i take all this out to a 40km long beach along the cost, noone around
[13:41] <Laurenceb> neat, i'm planning on a test drop from 4Km in 2 weeks
[13:41] <Laurenceb> from cambridge
[13:41] <defy_> 4km? can that actually be called a test? lol
[13:41] <defy_> thats pretty damn high
[13:41] <Laurenceb> yes ;)
[13:41] <Laurenceb> as high as this thing can go as it has no insulation
[13:43] <Laurenceb> need to work out where to send it to land...
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[14:10] <defy_> hehe
[14:10] <defy_> landings always a pain ;)
[14:10] <Laurenceb> yes need an area with few houses
[14:10] <Laurenceb> and good radio reception at the launch site
[14:11] <Laurenceb> the antenna design is a bit of a problem. Still havent decided on the best sort
[14:11] <defy_> what mhz?
[14:11] <Laurenceb> 433
[14:12] <defy_> egg beater style good for 433?
[14:12] <Laurenceb> Rocketboy already has a radio unit to use, we just need ant
[14:12] <Laurenceb> hmm idont know much about antennas
[14:12] <defy_> neither
[14:12] <Laurenceb> its 10mw, is there any risk of interferance
[14:13] <Laurenceb> oh okay if you dont know much either lol
[14:13] <defy_> I'm using maxstreams xtend modules, they're performing great so far..I get about 15 miles range line of sight with the basic dipoles that it came with
[14:13] <Laurenceb> we used the same unit on one of my balloons and calculated 200km range using attenuators
[14:14] <Laurenceb> its 300baud
[14:14] <defy_> hehe
[14:14] <Laurenceb> -same unit=the one I'm planning on using not maxstream
[14:14] <defy_> yea
[14:15] <Laurenceb> its a pick and then a FM unit from rfsolutions, pic recieves serial then does pulse shaping
[14:15] <Laurenceb> pick=PIC
[14:16] <Laurenceb> we'll probably use a dipole in the back of the fusalage, vertically orientated
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[18:07] <edwardmoore> hi jcoxon
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[22:01] <LaurenceB> Hi all
[22:03] <LaurenceB> Lots of glider progress :-) seem to have cracked the PID problem
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[22:08] <rocketboy> hi laurence - just looking at your code
[22:10] <rocketboy> I'm not sure why rudder=(P + I + D) isn't inside the 20ms loop
[22:11] <LaurenceB> erm you dont know the heading from the gps
[22:11] <LaurenceB> but hat might be a very good idea
[22:11] <LaurenceB> hat=that
[22:12] <LaurenceB> I'm just sending you an email with some photos of the fusalage
[22:12] <LaurenceB> showing where the antenna will go
[22:13] <rocketboy> then since the calculation of I P and D is also outside of the 20ms loop I don't see its purpose
[22:13] <rocketboy> (I could just be thick)
[22:13] <rocketboy> Ok will look out
[22:14] <jcoxon> rocketboy, all good for tomorrow?
[22:14] <rocketboy> jc - yep
[22:15] <LaurenceB> it works out P,I, and D from the gps which is at 1 hz
[22:15] <LaurenceB> whats on tomorrow?
[22:15] <jcoxon> we are doing some parafoil work
[22:16] <LaurenceB> cool
[22:17] <rocketboy> I guessed that was its purpose - but I can see how
[22:17] <rocketboy> nothing after the loop is dependant on the loop contents
[22:20] <LaurenceB> sent the email
[22:21] <LaurenceB> there are two section to the code, ascent and descent, the cutdown is in the middle
[22:21] <rocketboy> jc - what time tomorrow?
[22:22] <jcoxon> 10, 10.30
[22:22] <rocketboy> OK
[22:23] <jcoxon> there are sheep in the surrounding fields but i don't think they'll cause too much trouble :-)
[22:23] <LaurenceB> where are you going to do this test from?
[22:24] <jcoxon> where i live
[22:24] <LaurenceB> I see
[22:25] <rocketboy> the sheep should be no problem
[22:25] <LaurenceB> I've been testing on the hill behind my house, but the glider works well enough to head into the housing estate
[22:25] <LaurenceB> and if the PID works as well as the simulation I'll lose it
[22:27] <LaurenceB> Tested the cut down earlier, the resistor basically exploded! got so hot it desoldered itself from the cable
[22:28] <LaurenceB> worried tho it might burn up too fast to cut the rope, so I'll replace the 0.125Watt with a 0.25Watt
[22:30] <rocketboy> lb - I have replied to you email
[22:30] <LaurenceB> rocketboy- the radio will fit in the hose going halfway under the flight computer board
[22:31] <LaurenceB> hmm must have been fake carbon fiber, thought the plane was too cheap to have it
[22:35] <rocketboy> whay was the antenna in it?
[22:35] <rocketboy> whay = why
[22:36] <LaurenceB> it was origionally a toy RC plane off ebay
[22:37] <rocketboy> and the RC antenna was up the cf?
[22:38] <LaurenceB> I'll power it off a 9V lithium battery, but it will need about 50 grams or so in the nose
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[22:39] <rocketboy> hi ed
[22:40] <rocketboy> lb - ok I have worked out the loop
[22:41] <edwardmoore> hi steve
[22:42] <edwardmoore> weather looks good!
[22:42] <rocketboy> yep - if it is like today but less windy it will be great
[22:43] <edwardmoore> supposedly is- and warmer
[22:44] <edwardmoore> if i get a pro38 case, and i'd like to only get 1 preferably, how mainy grains? would want to get probs just L1 with it but also have it be able to do good high performance stuff
[22:45] <edwardmoore> for a 54mm body, 3fin, dual deployment, about 5ft
[22:49] <rocketboy> If you want a safe cert I'd go for a minimum H (2 grain) - if you have somthing to prove go for the 5 grain I540 (what a motor)
[22:50] <edwardmoore> may aswell start with a bang. was planning (tho who knows) to go hybrid after that
[22:50] <jcoxon> right. i'm off to bed
[22:51] <rocketboy> CU tomorrow
[22:51] <jcoxon> will hopefully see you guys tomorro
[22:51] <jcoxon> w
[22:51] <edwardmoore> aye
[22:51] <edwardmoore> 10.30
[22:51] <jcoxon> give me a call if there is a problem
[22:51] <edwardmoore> traffic permitting
[22:51] <jcoxon> of course
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[22:53] <edwardmoore> i know the I is more powerful than the H, obv, but other than that should it cause any real problems with getting the cert- are there added considerations?
[22:54] <rocketboy> keeping the fins on
[22:54] <edwardmoore> :)
[22:54] <rocketboy> just more stresess really
[22:55] <edwardmoore> glass the tubes?
[22:55] <edwardmoore> they're normal rather than phenolic
[22:58] <rocketboy> Your on the borderline with a 54mm airframe and an I540 IMO - best to glass
[23:00] <edwardmoore> h'ok. 2 layer of 2oz should work you reckon?
[23:00] <edwardmoore> also where's best to buy it?
[23:01] <rocketboy> I think Rocket and things sell it - I have never done it myself - always used solid glass fibre tubes or aluminium
[23:02] <rocketboy> but pleanty of the guys at ears use it - I certainly would recommend for normal cardboard
[23:02] <rocketboy> recommend = recommend it
[23:03] <edwardmoore> cool, will give it a try
[23:04] <edwardmoore> deepskyrocketshop don't seem to give names like H or I, just number of grains- unless i'm misreading the thing entirely
[23:05] <edwardmoore> i no i see it. sorry was being retarded
[23:05] <rocketboy> ahhhhhhhhhhhhhhhggggggggggggggg nooooooooo not deepsky
[23:06] <edwardmoore> don't buy from them?
[23:06] <rocketboy> there is a bit of history there - most of the guys don't by from them because of it
[23:06] <edwardmoore> do tell :)
[23:07] <rocketboy> but I shouldn't try to influence you - they will give you reliable service - all be it a bit pricy IMO
[23:07] <rocketboy> I tell you tomorrow
[23:07] <edwardmoore> ok cool
[23:08] <edwardmoore> in the mean time, for browsing porn, who's good to buy this sorta stuff from?
[23:11] <rocketboy> http://www.rocketsandthings.com/ - http://www.rocketstore.co.uk/ - http://www.unclebobsrocketshop.com for hybrid stuff - http://www.apo11o.co.uk/ for model stuff
[23:12] <edwardmoore> marvellous, tyvm
[23:13] <rocketboy> OK I'm up for some sleep CU tomorrow
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[23:14] <edwardmoore> cya tomorrow
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