highaltitude.log.20070306

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[21:20] <jcoxon> evening all
[21:20] <rocketboy> hiya
[21:21] <jcoxon> hey rocketboy
[21:22] <jcoxon> just wiring up my digital compass
[21:22] <rocketboy> Ah - ok - have you tried it yet?
[21:22] <rocketboy> whats the interfcae I2C?
[21:22] <jcoxon> i tested it a while ago
[21:22] <jcoxon> yeah its i2c
[21:22] <jcoxon> and they even distribute some code for linux
[21:22] <jcoxon> which helps
[21:23] <jcoxon> annoyingly it runs needs 5v power
[21:23] <jcoxon> so i'm just sorting that out before i check it all works
[21:24] <rocketboy> Ah well - can't have everything - whats the update rate?
[21:26] <jcoxon> not actually sure
[21:28] <jcoxon> been looking into making a parawing to test
[21:28] <jcoxon> some pretty good plans online - though will have to brush up on my sowing machine skills
[21:31] <rocketboy> Yeah - I have an old singer (manual) sewing machine from about 1920 - evidently its a good choice if you want to punch through the thick material like parachutes.
[21:32] <rocketboy> Ideally we need to find someone who already has good sewing skills
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[21:33] <jcoxon> yeah
[21:33] <jcoxon> hmmm
[21:35] <rocketboy> I came across this lady - http://www.raindropkites.co.uk/ - she makes kites (and sells singer spares) - I asked her if she would make a NPW5 - she seemed interested - but I think she wanted a few orders
[21:37] <jcoxon> well i'd be interested
[21:37] <jcoxon> however the more i think about it it might be worth us making our own
[21:37] <jcoxon> just so that we can change/adapt it
[21:38] <rocketboy> yep - well if we cant find anyone else I can have a go - it'll probably take an evening or so - depending on size
[21:39] <jcoxon> i'm sure my mother wouldn't mind :-p
[21:39] <rocketboy> I already have some ripstop nylon sheet (a local shp sells it)
[21:39] <jcoxon> helping that is
[21:39] <rocketboy> excellent
[21:39] <jcoxon> rocketboy, is the plan to each pursue making stuff
[21:39] <jcoxon> or work together on a single "model"
[21:40] <jcoxon> (i recognise that we are only just exploring options right now)
[21:40] <rocketboy> don't mind - I'm sure we would get further ahead faster if we all worked together
[21:40] <jcoxon> okay, sounds like a plan
[21:41] <rocketboy> I'll continue to play with the parafoil - but I'm sort of convinced the NPW5 is the way 2 go
[21:41] <jcoxon> i'm thinking that as well
[21:41] <jcoxon> that video says it all
[21:42] <rocketboy> So - we need to decide on a prototype size - then get one made
[21:42] <jcoxon> also read the first page of the paper about those tests
[21:42] <jcoxon> yeah
[21:42] <jcoxon> basically we need to calculate weights
[21:42] <jcoxon> and therefore size
[21:44] <rocketboy> Well it would be kind of nice to make somthing that was useful for a real flight - so about 750g size?
[21:45] <jcoxon> thats sounds good
[21:45] <jcoxon> could take a gumstix or PIC based payload then
[21:46] <rocketboy> Thats equivelent to about a 1m chute - so we need somthing with a similar area
[21:47] <jcoxon> http://www.xs4all.nl/~pdj/nasaplan.htm
[21:47] <rocketboy> (mostly chutes come down to area)
[21:47] <jcoxon> any chance you could run the win95 program?
[21:48] <jcoxon> or did you say you had a spreadsheet calculator
[21:49] <rocketboy> I'll try the prog - I'd say we want to go for 1m^2 or just a bit smaller
[21:51] <rocketboy> just loading it up - If I disapear it had a virus ;-)
[21:51] <jcoxon> good luck :-p
[21:53] <rocketboy> Height 100
[21:53] <rocketboy> -
[21:53] <rocketboy> A = 100
[21:53] <rocketboy> B = 50.00
[21:53] <rocketboy> C = 70.70
[21:53] <rocketboy> D = 70.70
[21:53] <rocketboy> E = 29.40
[21:53] <rocketboy> F = 100.00
[21:53] <rocketboy> G = 76.50
[21:54] <rocketboy> H = 8.70
[21:54] <rocketboy> I = 61.90
[21:54] <rocketboy> K = 2.20
[21:54] <rocketboy> L = 10.00
[21:54] <rocketboy> M = 8.30
[21:54] <rocketboy> N = 3.60
[21:54] <rocketboy> T = 4.30
[21:54] <rocketboy> -
[21:54] <rocketboy> Area: 1.2 m2
[21:54] <rocketboy> -
[21:54] <rocketboy> Bridle: 42 m
[21:54] <rocketboy> BRIDLE
[21:54] <rocketboy> A1 = 121.30
[21:54] <rocketboy> A2 = 122.70
[21:54] <rocketboy> A3 = 122.70
[21:54] <rocketboy> A4 = 122.70
[21:54] <rocketboy> A5 = 122.70
[21:54] <rocketboy> A6 = 122.70
[21:54] <rocketboy> A7 = 122.70
[21:54] <rocketboy> A8 = 122.70
[21:54] <rocketboy> A9 = 120.00
[21:54] <rocketboy> A10 = 117.30
[21:54] <rocketboy> A11 = 114.70
[21:54] <rocketboy> A12 = 110.70
[21:54] <rocketboy> B1 = 116.70
[21:54] <rocketboy> B2 = 114.00
[21:54] <rocketboy> B3 = 110.00
[21:54] <rocketboy> B4 = 105.10
[21:54] <rocketboy> B5 = 95.60
[21:54] <rocketboy> B6 = 86.60
[21:55] <rocketboy> -
[21:55] <rocketboy> Spacing A*-A*
[21:55] <rocketboy> 8.33
[21:55] <rocketboy> Spacing B*-B*
[21:55] <rocketboy> 16.60
[21:55] <rocketboy> Thats for a 1m chute
[21:55] <rocketboy> I'll email it
[22:00] <rocketboy> done
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[22:04] <rocketboy> Oops - disconnected
[22:04] <rocketboy> I can cut the ripstop up tomorrow and post?
[22:05] <jcoxon> post to me?
[22:05] <rocketboy> yep (or your mum)
[22:06] <jcoxon> i'm at uni right now
[22:06] <jcoxon> and will be for another 3 weeks
[22:06] <jcoxon> will have to ask her :-)
[22:06] <jcoxon> (I've got to stay up longer as i need to complete my research project)
[22:06] <rocketboy> OK - no probs - I'll post to you
[22:07] <jcoxon> i guess there is no harm in cutting it up tomorrow
[22:07] <jcoxon> i'll speak to her tomorrow and ask if she minds sowing it for us
[22:08] <rocketboy> I'll see if I can get a few colours - to make each pannel different (easier to se)
[22:08] <rocketboy> see
[22:10] <jcoxon> sounds good
[22:14] <jcoxon> woohooo - compass works
[22:14] <jcoxon> the default program must read at less than 1 hz
[22:16] <jcoxon> right i'll bbl
[22:17] <rocketboy> CU
[22:28] <rocketboy> bbl2
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[00:00] --- Wed Mar 7 2007