highaltitude.log.20160916

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[00:09] <SpacenearUS> New vehicle on the map: 03HORUSLORA - 12https://tracker.habhub.org/#!qm=All&q=HORUSLORA
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[00:47] <SpacenearUS> New position from 03DL7AD-11 after 037 hours silence - 12https://tracker.habhub.org/#!qm=All&q=DL7AD-11
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[01:43] <SpeedEvil> http://www.arianespace.com/mission/vega-flight-vv07/ 2 minutes
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[07:37] Last message repeated 1 time(s).
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[07:48] <SpacenearUS> New vehicle on the map: 03HIRFW-5 - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-5
[07:56] <SpacenearUS> New vehicle on the map: 03maverick_chase - 12https://tracker.habhub.org/#!qm=All&q=maverick_chase
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[08:04] <Elwell> https://www.youtube.com/watch?v=X-NArpXUcCY&t=1m37s bamboo rockets anyone?
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[08:27] <AndyEsser> morning
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[08:28] <fsphil> g'mo
[08:30] <nick_> Are people familiar with the unit: kpc?
[08:30] <Vaizki> kiloparsecs?
[08:31] <nick_> Yeah
[08:31] <Vaizki> no, never heard of it
[08:31] <Vaizki> :D
[08:31] <nick_> I'm trying to find a punchy title for something.
[08:32] <nick_> And don't want a term that people won't understand.
[08:32] <Vaizki> most people will know KFC
[08:33] <nick_> I'm trying to juxtapose 10 m and 10 kpc
[08:33] <nick_> 10 m and 10^20 m is also possible.
[08:34] <nick_> 10^20 kinda breaks my "no latex in titles" rule.
[08:35] <AndyEsser> 10 goto 20
[08:36] <Vaizki> no latex outside the bedroom
[08:37] <fsphil> that rule can be stretched a bit
[08:39] <Vaizki> are you sure? I'd say it's pretty watertight
[08:40] <SpacenearUS> New position from 03KF5KMP-3 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KF5KMP-3
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[09:49] <SpacenearUS> New vehicle on the map: 03DL0PTB-11 - 12https://tracker.habhub.org/#!qm=All&q=DL0PTB-11
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[10:32] <SpacenearUS> New position from 03KD2EAT-10 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2EAT-10
[10:39] <WillDuckworth> is hackvana still the preferred PCB fab place at the moment or any recommendations for alternatives?
[10:39] <craag> dirtypcbs is good - all automated, no human contact, but good experiences so far.
[10:40] <russss> yeah I am a dirtypcbs fan.
[10:41] <WillDuckworth> cheers- shall take a look
[10:46] <fsphil> yes, fewer humans == better
[10:47] <russss> well, apart from the bit where my order got lost in limbo on their beta site. Fairly sure humans were involved in that.
[10:47] <fsphil> mmm
[10:47] <fsphil> I got two batches of mine. probably human error too
[10:47] <fsphil> I've over 20 of them and only needed about 5
[10:48] <craag> more coasters :D
[10:48] <russss> they did send me 20 on that order in the end, I assumed it was by way of an apology
[10:49] <fsphil> yes the spare boards will come in useful somewhere. maybe holding other boards when applying paste
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[10:57] <Vaizki> always break out all the spare pins from chips then, make reuse of extras easier :)
[10:59] <miek> https://github.com/BastilleResearch/gr-lora
[11:03] <SpacenearUS> New position from 03IV3SRD-11 after 038 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[11:15] <Vaizki> miek, mmmmmm...
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[11:43] <edmoore> WillDuckworth: good to briefly bump in on sat
[11:43] <edmoore> Sorry didn't get a chance to have a chat
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[12:34] <SpacenearUS> New position from 03KD0HIP-7 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=KD0HIP-7
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[12:46] <Laurenceb__> looks like UBSEDS-20 died?
[12:46] <Laurenceb__> a pity
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[12:56] <SA6BSS-Mike|2> usbseds18 stillgoing so...
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[14:32] <Laurenceb> http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.458.909&rep=rep1&type=pdf
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[14:55] <SpacenearUS> New vehicle on the map: 03Qwert_chase - 12https://tracker.habhub.org/#!qm=All&q=Qwert_chase
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[14:57] <Laurenceb> ^ useful for modelling balloon payload oscillation
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[15:06] <ryan_in> Does anyone know of an easy way to extract certain parts of the telemetry log file for data analysis
[15:06] <adamgreig> just import it into excel as a csv :p
[15:09] <ryan_in> Brilliant, thank you!
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[15:24] <SpacenearUS> New position from 03UBSEDS18 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=UBSEDS18
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[15:41] <Laurenceb> so for 4.5m/s ascent velocity I get resonance between payload and vortices at 20m suspension cord length
[15:41] <Laurenceb> thats probably quite a common length
[15:50] <Geoff-G8DHE-M> So is it better to go longer or shorter to avoid the resonance ?
[15:51] <Laurenceb> maybe...
[15:51] <Geoff-G8DHE-M> :0
[15:51] <Laurenceb> there are two effects, the vortex shedding and wind
[15:52] <Laurenceb> maybe *someone* could come up with a model...
[15:52] <Geoff-G8DHE-M> Who's the model man around here ?
[15:52] <Laurenceb> but all the basic theory and power law turbulence trends etc for the atmosphere seem to be well understood
[15:53] <Laurenceb> well I could model it if I wasn't busy...
[15:53] <Laurenceb> Re for typical balloon is around 10^4 at altitude
[15:54] <Laurenceb> so there are two modes according to figure 4 in my link
[15:54] <Geoff-G8DHE-M> Is that all ?
[15:54] <Laurenceb> it's going fairly slowly and the air is thin
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[16:33] <SpeedEvil> at 20m cord length, won't that be easily visible in gps?
[16:33] <SpeedEvil> oh
[16:33] <SpeedEvil> I guess not so easily if sampled every 10s
[16:33] <SpeedEvil> or moe
[16:34] <SpeedEvil> I guess in principle doppler
[16:34] <SpeedEvil> but...
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[17:24] <Laurenceb> http://www.dtic.mil/dtic/tr/fulltext/u2/a201751.pdf
[17:24] <Laurenceb> comparing with the data there is seems turbulence from the balloon can easily dominate
[17:25] <Laurenceb> if you hit resonance you could probably see +-20degree pendulum oscillation
[17:25] <Laurenceb> which matches what is seen in some videos
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[17:53] <Laurenceb> proper CFD of an ascending balloon could be interesting
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[18:36] <SpacenearUS> New vehicle on the map: 03KG7WPU-11 - 12https://tracker.habhub.org/#!qm=All&q=KG7WPU-11
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[19:29] <SpacenearUS> New vehicle on the map: 03smttmd4166a419062_chase - 12https://tracker.habhub.org/#!qm=All&q=smttmd4166a419062_chase
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[23:26] <M0RJX> Missed a ping in the history!!
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[00:00] --- Sat Sep 17 2016