highaltitude.log.20171026

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[01:19] <SpacenearUS> New vehicle on the map: 03car_chase - 12https://tracker.habhub.org/#!qm=All&q=car_chase
[01:22] <SpacenearUS> New position from 03BSS12 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS12
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[04:36] Nick change: day__ -> daey
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[05:04] <SpacenearUS> New vehicle on the map: 03PLASTIC - 12https://tracker.habhub.org/#!qm=All&q=PLASTIC
[05:04] <SpacenearUS> New vehicle on the map: 03FOAM - 12https://tracker.habhub.org/#!qm=All&q=FOAM
[05:06] Action: PE2BZ wants everyone to know that PLASTIC and FOAM are no real flights. It´s a -18 degrees C test with 2 different housings and a non isolated 18650 battery
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[05:14] <SpacenearUS> New position from 03HIRF-6 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRF-6
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[05:40] <SpacenearUS> New position from 03HIRFW-6 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
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[06:42] <SpacenearUS> New position from 03M10 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=M10
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[07:00] <SpacenearUS> New position from 03SP5RZP-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP5RZP-11
[07:21] <Mike-SA6BSS|2> BSS12 have been afloat for 21 days - new personal best :)
[07:31] <SpacenearUS> New vehicle on the map: 03SQ2ODE-11 - 12https://tracker.habhub.org/#!qm=All&q=SQ2ODE-11
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[08:10] <SpacenearUS> New vehicle on the map: 03wqh1320_chase - 12https://tracker.habhub.org/#!qm=All&q=wqh1320_chase
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[09:09] <SpacenearUS> New position from 03PILOTS-BL after 037 days silence - 12https://tracker.habhub.org/#!qm=All&q=PILOTS-BL
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[10:56] <SpacenearUS> New vehicle on the map: 03BARC4 - 12https://tracker.habhub.org/#!qm=All&q=BARC4
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[11:04] <SpacenearUS> New vehicle on the map: 03SITS5 - 12https://tracker.habhub.org/#!qm=All&q=SITS5
[11:18] <SpacenearUS> New position from 03YPADSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[11:40] <SpacenearUS> New position from 03RSIST after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
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[11:46] <SpacenearUS> New vehicle on the map: 03CYBRGIRL - 12https://tracker.habhub.org/#!qm=All&q=CYBRGIRL
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[13:31] <SpacenearUS> New position from 03SP8IZA-12 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP8IZA-12
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[13:48] <SpacenearUS> New vehicle on the map: 03STRATO_OL - 12https://tracker.habhub.org/#!qm=All&q=STRATO_OL
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[14:35] <SpacenearUS> New position from 03PILOTS-GR after 038 days silence - 12https://tracker.habhub.org/#!qm=All&q=PILOTS-GR
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[15:04] <SpacenearUS> New vehicle on the map: 03SP8IKA-12 - 12https://tracker.habhub.org/#!qm=All&q=SP8IKA-12
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[15:53] <SpacenearUS> New position from 03N7SMI-11 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=N7SMI-11
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[16:54] <SpacenearUS> New vehicle on the map: 03K7HAK - 12https://tracker.habhub.org/#!qm=All&q=K7HAK
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[18:49] <SpacenearUS> New vehicle on the map: 03U3S18 - 12https://tracker.habhub.org/#!qm=All&q=U3S18
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[20:27] <xur17> If I have a helium tank with 150 cu ft of helium, and I have a weather balloon that needs 125 cu ft for a 3.4 m/s ascent rate, we should be fine, right? Does anyone know ~how much gas will be left in the tank when the pressure equalizes?
[20:27] <xur17> Intuitively I'm guessing there should be something like 2 cu ft left?
[20:27] <xur17> We kinda screwed up purchasing the correct amount of helium the last time, so I'm a bit paranoid...
[20:27] <russss> yeah it's literally the volume of the tank
[20:34] <xur17> But there's gas left in the tank when it equalizes
[20:34] <OZ7EMA> what is the pressure in the tank?
[20:34] <xur17> 2000 psi
[20:36] <russss> pressure * volume is always constant
[20:36] <OZ7EMA> how much is the volume of the tank?
[20:36] <russss> so do the maths
[20:40] <xur17> 0.9 cu ft (6.5 in diameter, 47 in height)
[20:41] <xur17> And I'm guessing the pressure is in the neighborhood of 1 or 2 atmospheres when it equalizes
[20:41] <xur17> So a few cubic feet left.
[20:42] <xur17> We should be fine as long as we don't lose a bunch of helium
[20:42] <OZ7EMA> jupp
[20:42] <xur17> yay
[20:42] <xur17> Last time we floated it for like 10 hours
[20:43] <xur17> Hoping for a shorter travel time :)
[20:43] <OZ7EMA> :D
[20:43] <xur17> Thanks for the help
[20:43] <OZ7EMA> your welcome
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[23:17] <SpacenearUS> New position from 03YPADSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
[23:19] <SpacenearUS> New position from 03BSS12 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS12
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[00:00] --- Fri Oct 27 2017