highaltitude.log.20181121

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[02:29] <Darkside> daveake: grr
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[05:16] <SpacenearUS> New vehicle on the map: 03SP8GON_chase - 12https://tracker.habhub.org/#!qm=All&q=SP8GON_chase
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[05:55] <SpacenearUS> New vehicle on the map: 03OGMikki_chase - 12https://tracker.habhub.org/#!qm=All&q=OGMikki_chase
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[08:57] <SpacenearUS> New position from 03MAGNU after 0313 days silence - 12https://tracker.habhub.org/#!qm=All&q=MAGNU
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[11:06] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
[11:30] <SpacenearUS> New position from 03Legionowo after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=Legionowo
[11:35] snowcrasheu (~snowcrash@82-71-9-144.dsl.in-addr.zen.co.uk) joined #highaltitude.
[11:36] <snowcrasheu> Hi there - anyone here from the West Midlands?
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[11:47] <daveake> Ian_ is
[11:47] <daveake> What's the real question ?
[11:48] <daveake> We get WM TV if that counts :p
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[11:51] <AndyEsser> daveake: do you get S4C over your way as well?
[11:52] <daveake> Erm dunno
[11:52] <fsphil> sounds exotic
[11:52] <daveake> The mast is safely this side of the border :)
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[12:06] <snowcrasheu> Yeah - havent launched a balloon as yet but would like to do so. Wanted to see if anyone else in the West Midlands was interested in teaming up to do so.
[12:12] <daveake> Wherever you launch from you'll need to avoid Brum airport
[12:12] <daveake> I launch from Ross On Wye and sometimes the winds go thataway, precluding a launch
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[13:37] <Ian_> Hello snowcrasheu - West Midlands. What are you thinking of launching, Pico or larger, and more importantly from where?
[13:38] <Ian_> I've been a bit slow in reading the channel today :)
[13:41] <snowcrasheu> Ian_: yes, a Pico is probably a good start.
[13:42] <snowcrasheu> Havent decided where yet. Open to suggestions
[13:42] <snowcrasheu> Im based near Stratford upon Avon so I guess somewhere within 5 or 10 miles
[13:43] <Ian_> A pico is obviously unregulated and so much less of a problem launch wise. LoRa?
[13:43] <snowcrasheu> There used to be Long Marston Airfield where you could schedule stuff but this is sadly no more.
[13:46] <Ian_> I'm pretty much in the thick of it at Oldbury - M5 J2
[13:47] <snowcrasheu> LoRa sounds an easy initial step
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[13:54] <snowcrasheu> Probably near Oxhill
[14:33] <fsphil> my brain tried to read that as a hex value
[14:34] <Ian_> :) meltdown imminent . . . it's about 50miles and 1hour from me - base 10, for clarity!
[14:35] <vaizki> all your base are belong to us
[14:38] <Ian_> Any more of this and you will all be pun-ished
[14:56] <SpacenearUS> New vehicle on the map: 03Manc - 12https://tracker.habhub.org/#!qm=All&q=Manc
[14:57] <cm13g09> fsphil: XD
[14:57] <cm13g09> 0xc0ffee required.
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[15:06] <daveake> Is it 0xFEEDFACE time yet ?
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[15:26] <michal_f> https://i.imgur.com/9UVEW.gif
[15:28] <daveake> heard it
[15:30] <michal_f> I once showed it to a friend from Germany.. he replied: 'weird'
[15:33] <SpacenearUS> New vehicle on the map: 03PC4L-chase - 12https://tracker.habhub.org/#!qm=All&q=PC4L-chase
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[19:46] <SpacenearUS> New vehicle on the map: 03DenstoneL - 12https://tracker.habhub.org/#!qm=All&q=DenstoneL
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[20:13] <SpacenearUS> New vehicle on the map: 03DenstoneR - 12https://tracker.habhub.org/#!qm=All&q=DenstoneR
[20:38] <chris_99> https://www.scientificamerican.com/article/silent-and-simple-ion-engine-powers-a-plane-with-no-moving-parts/
[20:41] <chris_99> a video on it - https://www.youtube.com/watch?v=boB6qu5dcCw
[20:48] <edmoore> the article is _awful_ but the idea is nice
[20:49] <chris_99> yeah the idea is fascinating, i really like it
[20:50] <edmoore> simpler demo of the effect - https://www.youtube.com/watch?v=7nM2u2FDWsQ
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[20:53] <chris_99> :) if i wanted to play with that kind of thing, would you mainly use a voltage multiplier type circuit like a CockcroftWalton generator ?
[20:55] <edmoore> yep that would work
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[20:56] <edmoore> note that it's not inherently silent vs the inherently noisy propellors, it's just that his thruster moves a very large area of air relatively slowly
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[20:56] <edmoore> whereas a prop moves a relatitely small area of air much faster
[20:57] <edmoore> both will need to move a given mass of air per second to get the thrust
[20:57] <chris_99> ahh
[20:57] <chris_99> interesting point
[20:57] <edmoore> and, at least subsonically, the jet noise generated by turbulance (which is what is making the noise) goes up with with eighth power of velocity
[20:57] <edmoore> which is truly batty
[20:58] <edmoore> so if you double the velocity of the air coming out of your thruster, it gets 2^8 = 256 times louder
[20:59] <chris_99> wow
[20:59] <edmoore> so yeah, there is a massive win (noise wise) for getting a given amount of thrust by moving a larger area of airflow slower
[21:01] <chris_99> i wonder, if you could 'turn' the plane too, electrostatically by having electrodes on each part of the wing, and turning just one wing's set on? maybe that wouldn't work
[21:01] <edmoore> no it would work i think
[21:01] <edmoore> like skid-steering on a tank
[21:01] <chris_99> cool
[21:08] <SpeedEvil> Flapping for example would be enormously quieter.
[21:08] <russss> eighth power wtf
[21:08] <SpeedEvil> But has technical challenges.
[21:08] <SpeedEvil> One of my projects that is on the back burner is a weight-shift plane.
[21:09] <SpeedEvil> https://www.youtube.com/watch?v=MoaWlKC3wIM
[21:09] <SpeedEvil> FASTEST RC AIRPLANE IN THE WORLD! Transonic DP -- 545mph!!
[21:10] <SpeedEvil> - take this wing, and add a bar which rotates with the end fore-up-aft-down constantly, with a weight on the end, and a mechanism to rotate the wing so it has either a positive or negative angle of attack apropriately
[21:12] <chris_99> 'Dynamic soaring is a flying technique used to gain energy by repeatedly crossing the boundary between air masses of significantly different velocity.' i'm confused, so they keep circling through those boundaries to make it go faster and faster?
[21:13] <SpeedEvil> yes
[21:14] <SpeedEvil> https://www.youtube.com/watch?v=nv7-YM4wno8 Oooh
[21:14] <SpeedEvil> BTD10: The 835kph Sailplane and Dynamic Soaring
[21:14] <SpeedEvil> - more scientific presentation
[21:14] <chris_99> that's really neat, never heard of that before, so gliders can do that too, to go insanely fast?
[21:15] <SpeedEvil> That is gliders - it's just not manned.
[21:15] <SpeedEvil> the acceleration is so high it would kill the pilot
[21:15] <SpeedEvil> ~40G
[21:19] <chris_99> ah eek
[21:23] <edmoore> albatrosses fly like that chris_99
[21:23] <edmoore> it's how they can spend months at sea pretty much entirely airborne
[21:23] <edmoore> they'd never have the energy to do it if they had to flap
[21:23] <chris_99> nice :)
[21:24] <edmoore> but they soar between the peaks and troughs of the (very big southern-ocean) waves
[21:26] <SpeedEvil> Contains albatros picture at 13:40
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[21:46] <SpeedEvil> ^watch the above, it's awesome.
[21:46] <SpeedEvil> 34 minutes in - 'we designed it for 120+G'
[21:53] <SpeedEvil> Tipstalls because the tip is going transonic
[21:53] <SpeedEvil> (well, sort of)
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[23:07] <SpacenearUS> New position from 03IV3SRD-11 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[00:00] --- Thu Nov 22 2018