highaltitude.log.20181115

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[09:37] <SpacenearUS> New position from 03HORUSBINARY after 0311 days silence - 12https://tracker.habhub.org/#!qm=All&q=HORUSBINARY
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[10:49] <AndyEsser> getting to legitimately discuss rocket engine simulation as part of my OU degree is fun :D
[10:49] <AndyEsser> beats discussing stresses involved in bridges.....
[10:50] <chris_99> nice :)
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[10:51] <chris_99> i wonder if any of the simulations done by say nasa, spacex etc, are open source?
[10:51] <fsphil> it's good to build bridges
[10:51] <AndyEsser> chris_99: there is a talk from a couple years ago by 2 spacex engineers about how they do some of their simulations
[10:51] <chris_99> oh cool
[10:51] <AndyEsser> I'll find the youtube link
[10:51] <AndyEsser> two
[10:51] <AndyEsser> secs
[10:51] <chris_99> cheers
[10:51] <AndyEsser> but it doesn't go into details on actual simulations
[10:52] <chris_99> aha
[10:52] <AndyEsser> https://youtu.be/txk-VO1hzBY
[10:52] <chris_99> cheers, will watch that later
[10:54] <cm13g09> AndyEsser: Is it a concept that might take off?
[10:55] <SpacenearUS> New vehicle on the map: 03DC2EH-6 - 12https://tracker.habhub.org/#!qm=All&q=DC2EH-6
[11:00] <chris_99> i rather liked that atomic rocket for pure silliness (project orion iirc)
[11:02] <AndyEsser> cm13g09: :D
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[11:06] <SpacenearUS> New position from 03IV3SRD-11 after 038 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
[11:08] <SpacenearUS> New vehicle on the map: 03BZ0LOR - 12https://tracker.habhub.org/#!qm=All&q=BZ0LOR
[11:09] <edmoore> chris_99: quite a lot of nasa stuff is published
[11:09] <edmoore> or else just uses Fluent or some other standard package
[11:09] <chris_99> ah, neat!
[11:10] <edmoore> but the techniques are published
[11:10] <edmoore> ntrs.nasa.gov is a goldmine, provided you have some incling of what you're looking for
[11:12] <edmoore> that video AndyEsser linked is good
[11:13] <SpacenearUS> New vehicle on the map: 03SITS-5 - 12https://tracker.habhub.org/#!qm=All&q=SITS-5
[11:13] <edmoore> it's not really about rockets at all, just a much more sensible way of generating adaptive meshes to simulate fluids problems
[11:13] <chris_99> intriguing, the fluid being the atmosphere? or..
[11:14] <AndyEsser> chris_99: both
[11:14] <AndyEsser> they use it for say the aerodynamics of the Dragon capsule on re-entry
[11:14] <AndyEsser> and the fluid within a combustion chamber
[11:14] <chris_99> ah gotcha neat
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[11:17] <edmoore> any gas or liquid is a fluid
[11:19] <AndyEsser> my OU assignment is now discussing hypothetical costs with choosing waste disposal companies
[11:19] <AndyEsser> less fun....
[11:20] <AndyEsser> "bin-a-gogo" vs "we-want-your-waste-plc"
[11:20] <AndyEsser> *sigh*
[11:25] <fsphil> dump4u
[11:25] <fsphil> any company with "4u" in their name should be banned
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[11:35] <chris_99> heh, i guess you're not a patron of phones 4u 4 less, if they're still going ;)
[11:36] <fsphil> no definity not. I have standards
[11:37] <chris_99> hehe
[11:40] <day> edmoore: dont gases behave fundamentally different than fluids?
[11:41] <day> as in the resistance they exert against a moving object ramps up slower in fluids than it does in gases.
[11:41] <edmoore> no, they behave fundamentally the same way
[11:41] <edmoore> the difference is just in details
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[11:42] <edmoore> day: the resistence a fluid exerts on an object is 99% governed by its density
[11:42] <edmoore> that's it
[11:42] <day> i guess you could argue it away as a material property
[11:43] <edmoore> that is what you do. the governing principles are the same
[11:43] <day> edmoore: but a higher density leads to lower resistance at high speeds sounds rather odd
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[11:43] <edmoore> the maths has knobs in it for the properties - viscosity, density, etc
[11:43] <edmoore> day: it doesn't
[11:43] <edmoore> your sentence is wrong
[11:43] <edmoore> day> as in the resistance they exert against a moving object ramps up slower in fluids than it does in gases.
[11:44] <day> i thought theres a speed after which an object sees less resistance in water than it does in air
[11:45] <edmoore> almost certainly not
[11:45] <edmoore> i can't think of a scenario where that would be true, unless there's some other big variable
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[11:47] <day> i always found it odd too. but im absolutely sure i got that info from a source that i assumed to be reliable otherwise i would have dismissed it long ago. will dig a little
[11:54] <edmoore> but it's also a bit meaningless
[11:54] <edmoore> which is why we have the concept of a fluid
[11:56] <edmoore> a human on the earth's surface who is at 20C and thinking about 'water' and 'air' thinks there's a fundamental difference, but really the differences are not that fundamental for the purposes of modelling anything
[11:56] <edmoore> water behaves like air, just 1000x more dense and much less compressible
[11:56] <edmoore> and other properties that are all captures by the navier-stockes equations
[11:57] <edmoore> inside a rocket engine combustion chamber much of that earth-surface-human intuition goes out of the window anyway
[12:27] <AndyEsser> woo - assignment submitted
[12:27] <AndyEsser> I really need to get better at doing them _before_ the day of the deadline
[12:28] <chris_99> haha
[12:31] <chris_99> do you do practical assignments too, out of interest?
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[12:45] <SpacenearUS> New position from 03SP9UOB after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB
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[12:54] <SpacenearUS> New vehicle on the map: 03JOAL09 - 12https://tracker.habhub.org/#!qm=All&q=JOAL09
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[13:45] <PE2BZ> Good afternoon. Did anyone ever try an autofocus camera like https://www.ebay.com/itm/5MP-CMOS-OV5640-USB-Camera-Module-Board-For-Raspberry-Pi-30Degree-Autofocus-Lens-/221980456195 on a Pi flight ?
[13:46] <fsphil> I'm sure I've seen video from an autofocus camera before. it kept loosing focus when it got pointed at the sky
[13:47] <PE2BZ> Makes sense...
[13:47] <fsphil> the grease in the mechanism can freeze too
[13:50] <PE2BZ> Let´s first test the 2 camera´s which should arrive tomorrow for less lens distortion....
[13:50] <PE2BZ> https://www.ebay.com/itm/CMOS-Camera-Video-5MP-170-Fisheye-Autofocus-Lens-Webcam-for-Raspberry-PI-Windows/323365685445?hash=item4b4a18c8c5:g:2DcAAOSwn6dbWBfs:rk:2:pf:0
[13:50] <PE2BZ> That one I would like to test :-)
[13:51] <PE2BZ> Pointing downwards, test on a drone at first maybe
[13:54] <PE2BZ> Although no frost below 200 m
[13:54] <fsphil> autofocus seems a bit wasted on a fisheye lens
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[14:07] <PE2BZ> Well, my problem is that it´s almost to adjust focus from my home and from the launch location I have a nice view 10 - 16 km but I cannot connect a hdmi monitor to he PI when I am there...
[14:09] <PE2BZ> it´s almost ? impossible :-)
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[14:36] <fsphil> use the moon, that's basically infinity :)
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[14:54] <SpacenearUS> New vehicle on the map: 03NLS1 - 12https://tracker.habhub.org/#!qm=All&q=NLS1
[14:57] <SpacenearUS> New vehicle on the map: 03PD8MAH-11 - 12https://tracker.habhub.org/#!qm=All&q=PD8MAH-11
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[15:37] <SpacenearUS> New vehicle on the map: 03TEST02 - 12https://tracker.habhub.org/#!qm=All&q=TEST02
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[16:39] <SP9UOB-Tom> evening
[16:39] <fsphil> howdy
[16:40] <SP9UOB-Tom> fsphil: :-)
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[16:58] <SpacenearUS> New position from 03HABISRAEL after 035 days silence - 12https://tracker.habhub.org/#!qm=All&q=HABISRAEL
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[18:29] <SpacenearUS> New vehicle on the map: 03SSTAR0273 - 12https://tracker.habhub.org/#!qm=All&q=SSTAR0273
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[20:34] chris_99 (uid26561@gateway/web/irccloud.com/x-fnfyymzsimcnwcli) left irc:
[20:43] <PE2BZ> https://www.spacelaunchschedule.com/launch-schedule/launch-details.php?id=1306&fbclid=IwAR2rTG91IsC48AupVoON3VqH2lbc-oTpLR8Wsbzl1UB4UxC4uE1y16AFH5Y
[20:43] <SIbot3> In real units: 2 lbs = 907 g
[20:43] <PE2BZ> EsHail sat launch t - 2 minutes
[20:44] <fsphil> some people have spent a lot of money on gear to use this satellite. hope it all goes well :)
[20:44] <PE2BZ> I allready bought a 1 meter dish ;-)
[20:47] <fsphil> off it goes
[20:47] <fsphil> that never gets old
[20:48] <fsphil> nice shot
[20:48] <PE2BZ> Quite a speed for a HAB
[20:48] <fsphil> I was about to write it's only 50km but by the time I'd wrote that it was 60km
[20:49] <PE2BZ> pb0ahx is 3 seconds ahead with faster Internet
[20:50] <fsphil> oh you can see the moon
[20:52] <Darkside> huh waht did they just fly past
[20:53] <fsphil> very choppy video this time
[20:54] <fsphil> nice
[20:55] <michal_f> damn I missed that
[20:55] <fsphil> didn't miss much, the landing wasn't streamed
[20:55] <dbrooke> I've seen stuff fly past before, obviously aliens
[20:57] <dbrooke> that landing looks pretty accurate
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[21:09] <SpacenearUS> New position from 03PD8MAH-11 after 036 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PD8MAH-11
[21:12] <fsphil> toasty
[21:14] <PE2BZ> With this speed.... 1 hour to the Clark belt :-)
[21:14] <fsphil> wonder how bright the lamps are, if you could see them easily from the ground
[21:15] <PE2BZ> What QRG is the video link on :-)
[21:16] <fsphil> hah. I bet it's satellite based
[21:16] <PE2BZ> pun intended ?
[21:16] <fsphil> always
[21:17] <fsphil> it'll be fun to try and get a bit of ssdv through this satellite
[21:18] <PE2BZ> Slow Satellite Digital Vision
[21:18] <fsphil> weee
[21:19] <PE2BZ> Bye bye
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[21:19] <fsphil> oh it's shy
[21:20] <fsphil> ok now it's safe to spend money :p
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[21:46] <Darkside> https://twitter.com/Raspberry_Pi/status/1062978502981500928
[21:46] <Darkside> pff
[22:01] <fsphil> there goes their entire PR budget
[22:03] <kokey> I don't see the point of a Pi 3A, that's way higher power consumption than I would like
[22:04] <kokey> (that's a really bad joke, btw)
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[22:36] <SpacenearUS> New position from 03BSS18 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=BSS18
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[23:07] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[00:00] --- Fri Nov 16 2018