highaltitude.log.20171130

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[01:19] <ulfr^> http://arduiniana.org/libraries/iridiumsbd/
[01:19] <ulfr^> this looks interesting for tracking.
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[01:57] <SpacenearUS> New vehicle on the map: 03CG6K077 _chase - 12https://tracker.habhub.org/#!qm=All&q=CG6K077%20_chase
[01:57] <Laurenceb_> !whereis HIRFW-6
[01:57] <SpacenearUS> 03Laurenceb_: 03HIRFW-6 was over 03Nurimanovsky District, Republic of Bashkortostan, Russia 10(55.48107,56.96215) at 0311999 meters about 0315 hours ago
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[05:49] <SpacenearUS> New position from 03HIRFW-6 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
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[05:51] <SpacenearUS> New position from 03HIRF-6 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRF-6
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[07:10] <PE2BZ> mike-sa6bss solar question ? do yo wire solar supercap and payload all parallel or a rectifier diode between solar and supercap ?
[07:18] <SpacenearUS> New position from 03SP5RZP-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP5RZP-11
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[07:46] <SpacenearUS> New position from 03NEPTUN-4 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NEPTUN-4
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[08:12] <SpacenearUS> New vehicle on the map: 03opel_chase - 12https://tracker.habhub.org/#!qm=All&q=opel_chase
[08:13] <SpacenearUS> New vehicle on the map: 0369_chase - 12https://tracker.habhub.org/#!qm=All&q=69_chase
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[08:58] <Guest51405> k
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[09:11] <SpacenearUS> New position from 03B-26 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=B-26
[09:17] <SpacenearUS> New position from 03ZL1AB0 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=ZL1AB0
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[10:16] <craag> Ian_: The SUWS farnham websdr is in Farnham, not southampton ;)
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[10:41] <SpacenearUS> New position from 03VA2RMG-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=VA2RMG-11
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[11:19] <SpacenearUS> New position from 03YMMLSONDE after 037 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YMMLSONDE
[11:20] <SpacenearUS> New position from 03YPADSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[11:44] <SpacenearUS> New position from 03RSIST after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
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[12:22] <Laurenceb> !whereis HIRFW-6
[12:22] <SpacenearUS> 03Laurenceb: 03HIRFW-6 was over 03Ishimbayskiy Rayon, Republic of Bashkortostan, Russia 10(53.48107,56.96215) at 0311999 meters about 032 hours ago
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[12:38] <Mike-SA6BSS> PE2BZ: all in parallel without any diode
[12:40] <Mike-SA6BSS> if you are tilting (winter hab style) cells and you must fit a schotty diode on the + terminals from each aray
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[12:44] <PE2BZ> Thanks Mike, you get 73´from pb0ahx :-)
[12:44] <PE2BZ> We decided not to fly solar tomorrow but battery powered
[12:45] <PE2BZ> With a 4F supercap and 1.5 Volt battery parallel to the solar panels all runs well, but as soon as I disconnect the battery the radio stops within 1 second because the supercap drops to 0.7 Volt
[12:45] <PE2BZ> That´s why I was asking for the series diode
[12:46] <PE2BZ> with a 50 F / 2.7 Volt supercap is runs for about 2 minutes, but that is just as heavy as one Energizer lithium battery
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[13:13] <SpacenearUS> New position from 03KF5KMP-8 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KF5KMP-8
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[13:52] <Ian_> Thanks for the correction craag - I didn't want anyone sneaking up and stealing it - 35 miles, close but no cigar eh? :)
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[14:14] <SpacenearUS> New vehicle on the map: 03CHSFG - 12https://tracker.habhub.org/#!qm=All&q=CHSFG
[14:29] <craag> If you read the information linked on the site then it's got photos of where it is :)
[14:29] <craag> It's a secure commercial unit, so we're not fussed.
[14:32] <mfa298> if only there was some hint as to it's location.... perhaps in the name of something like that ;)
[14:35] <craag> http://gb3hv.com/site.html
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[14:44] <PE2BZ> !flights
[14:44] <SpacenearUS> 03PE2BZ: Current flights: 03CHSFG (EPSOM) 10(a629)
[14:44] <PE2BZ> !dial chfsg
[14:44] <SpacenearUS> 03PE2BZ: Can't find a flight doc matching your query
[14:44] <PE2BZ> !dial a629
[14:44] <SpacenearUS> 03PE2BZ: Latest dials for 03CHSFG (EPSOM) 10(a629): 03434.6 MHz, 434.59944 MHz
[14:55] Nick change: Maxell_ -> Maxell
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[15:32] <PE2BZ> chfsg stuck in GPS position ?
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[17:42] <PE2BZ> Good evening !
[17:42] <PE2BZ> Giving the measured 31 gram lift of my Chinese BoBo balloon and a payload of 20 gram that gives me 11 gram free lift. What would be the way to say something about the ascend rate ?
[17:46] <daey> i just happened to find this on ebay. assuming its titled correctly, it might be of interest
[17:46] <daey> https://www.ebay.de/itm/Radiosonde-Wetterballon-Senderplatte-E-071-Rohre-DC-96-und-DF-97/362166954748?hash=item5452d52afc:g:vjIAAOSwC-taFwI0
[17:46] <daey> some oldschool weatherballon transmitter based on tubes *according to the title*
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[18:09] <PE2BZ> daey that´s a nice piece !
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[19:28] <TT7> PE2BZ: what is the mass of the balloon?
[19:29] <Mike-SA6BSS> I beleve those bobo 36" are 22gram
[19:29] <PE2BZ> that´s 23 gram
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[19:32] <PE2BZ> Very close, Mike ;-)
[19:33] <TT7> and filled with helium or hydrogen?
[19:33] <PE2BZ> helium
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[19:36] <Mike-SA6BSS> :)
[19:36] <TT7> 1.5m/s initial ascent rate based on calcultions I used on my flights
[19:38] <TT7> if you want to look closer into the calculations, they are described here:
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[19:38] <TT7> http://tt7hab.blogspot.cz/2017/11/the-superpressure-balloons-vol-2.html
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[19:41] <PE2BZ> TT7 thanks. I used the calculator for a 30 g balloon and indeed ended up with 1.5 m/s :-) I might add a few grams to the payload to get about 1 m/s
[19:42] <PE2BZ> thanks for the link by the way
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[19:43] <TT7> no problem. it's just an estimate in standard atmosphere to get an idea. in reality it will vary based on local conditions and wind
[19:44] <PE2BZ> Business as usual, we will have to watch the results afterwards :-)
[19:45] <TT7> with my first balloons I aimed for 1m/s as well, but with the last two I went as low as 0.7m/s.. averaged data from the actual flights seem to support the estimates
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[19:46] <TT7> but I also waited for good weather days and launched during mornings before wind picks up
[19:47] <PE2BZ> Good weather should be tomorrow afternoon, and almost no wind :-)
[19:47] <TT7> then good luck :)
[19:47] <PE2BZ> BIG thanks !
[19:51] <TT7> do you have any idea of the balloon's volume?
[19:52] <PE2BZ> when burst ?
[19:52] <PE2BZ> or now, with 31 gram lift ? Diameter is 52 cm now
[19:52] <PE2BZ> I am afk
[19:53] <TT7> it's not intended as a floater?
[19:54] <PE2BZ> I hope for it :-)
[19:54] <PE2BZ> But that would be my first. We had one Latex for 10.5 hours
[19:54] <PE2BZ> This one should last days
[19:54] <TT7> ideally volume the balloon has while floating
[19:54] <PE2BZ> but I am still afk ;-)
[19:55] <Ian_> currently in read mode :)
[19:55] <PE2BZ> I have 9 BoBo balloons left. But only one payload of 3 gram ;-)
[19:55] <PE2BZ> B-26 phone home....
[19:55] <PE2BZ> Bye for now
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[19:59] <TT7> if you know the volume, you can estimate float altitude. I only calculated the volumes of my balloons and the results were quite off. so I was just curious whether you happened to know the volume of yours
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[20:24] <michal_f_home> !flights
[20:24] <SpacenearUS> 03michal_f_home: Current flights: 03CHSFG (EPSOM) 10(a629)
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[21:10] <PE2BZ> tt7 i can measure the circumference of the globe form if that helps ?
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[21:12] <TT7> it's probably not worth it. I did it that way on my balloons, but they are not perfect spheres so any calculations based on that will be off
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[21:29] <PE2BZ> My BoBo is almost perfect and has 147 cm circumference. Would you mind to do that calculation for me ?
[21:30] <PE2BZ> https://photos.app.goo.gl/9TvXkEHypDSFDnxv1
[21:31] <PE2BZ> Gives a volume of V = 0.0536417 m3
[21:40] <TT7> hm spherical balloon of 0.05364m3 with the previous parametrs should float at a density level of 0.9629 kg/m3 which is 2442m in standard atmosphere. 'mylar shape balloon' of such circumference would have 0.0605m3 and would float at a 0.854 density level which corresponds to 3606m'
[21:40] <TT7> it seems quite heavy payload for such small balloon
[21:44] <TT7> the amount of helium will probably stress the envelope a lot. it may even burst
[21:52] <TT7> high stress will stretch the envelope and increase its volume, thus making it float higher, but it all depends on what stress the material and the seam can take
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[21:57] <Mike-SA6BSS> bobo 36" is a elastic pvc balloon, I do think its the first tryout with this balloon
[21:58] <Mike-SA6BSS> PE2BZ: you know you should hand streach them before filling rhem
[21:58] <Mike-SA6BSS> *them?
[21:58] <Mike-SA6BSS> https://img.tomtop.com/product/xy/2000/2000/p/gu1/H/1/H20086-1/H20086-1-1-9317-duvp.jpg
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[22:02] <TT7> it will be interesting to see how much the envelope stretches in flight
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[22:21] <TT7> hm I found a video on youtube and the balloons seem to stretch quite a lot
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[22:22] <TT7> so the next question is how good a gas barrier the material is
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[23:18] <SpacenearUS> New position from 03YMMLSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YMMLSONDE
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[23:19] <SpacenearUS> New vehicle on the map: 03msea_chase - 12https://tracker.habhub.org/#!qm=All&q=msea_chase
[23:22] <SpacenearUS> New position from 03YPADSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[23:40] <SpacenearUS> New position from 03RSIST after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
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[00:00] --- Fri Dec 1 2017