highaltitude.log.20170415

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[00:15] <SpacenearUS> New position from 03YPADSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[04:40] <SpacenearUS> New position from 03HIRFW-3 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-3
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[05:39] <SpacenearUS> New position from 03KD0VJI-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD0VJI-11
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[06:08] <SpacenearUS> New position from 03HORUSLORA1 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HORUSLORA1
[06:10] <SpacenearUS> New vehicle on the map: 03VK5QI-9_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5QI-9_chase
[06:12] <SpacenearUS> New vehicle on the map: 03VK5ARG-9_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5ARG-9_chase
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[06:30] <SpacenearUS> New vehicle on the map: 03VK5AKH-9_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5AKH-9_chase
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[11:34] <SpacenearUS> New vehicle on the map: 03KF5KMP-2 - 12https://tracker.habhub.org/#!qm=All&q=KF5KMP-2
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[12:50] <SpacenearUS> New vehicle on the map: 03gggg_chase - 12https://tracker.habhub.org/#!qm=All&q=gggg_chase
[12:56] <SpacenearUS> New vehicle on the map: 03W3EAX-12 - 12https://tracker.habhub.org/#!qm=All&q=W3EAX-12
[12:56] <SpacenearUS> New vehicle on the map: 03W3EAX-13 - 12https://tracker.habhub.org/#!qm=All&q=W3EAX-13
[12:56] <SpacenearUS> New vehicle on the map: 03W3EAX-8 - 12https://tracker.habhub.org/#!qm=All&q=W3EAX-8
[13:02] <SpacenearUS> New vehicle on the map: 03KG5RHL-11 - 12https://tracker.habhub.org/#!qm=All&q=KG5RHL-11
[13:11] <SpeedEvil> https://xkcd.com/ :)
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[13:15] <Laurenceb_> https://www.hindawi.com/journals/ijae/2012/830536/
[13:15] <Laurenceb_> interesting idea
[13:15] <Laurenceb_> not sure about low cost, needs tens of km of railway track aligned radially
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[13:17] <SpeedEvil> Interesting.
[13:18] <SpeedEvil> 'reusability means cheap' - if you neglect utterly capital costs sometimes.
[13:18] <SpeedEvil> I need to read properly, but I need to understand cranial oximetry first
[13:19] <Laurenceb_> heh
[13:20] <Laurenceb_> basically its a low end launch loop connected to a balloon
[13:20] <SpeedEvil> :)
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[13:20] <Laurenceb_> I wonder how far it could be simplified - maybe a boat towing the balloon
[13:21] <SpeedEvil> Airship?
[13:21] <Laurenceb_> well a tethered blimp
[13:21] <SpeedEvil> I mean for the positioning
[13:22] <Laurenceb_> I was doing the numbers on supersonic smooth cable, looks like skin friction is quite low
[13:22] <Laurenceb_> it could probably credibly reach mach 3
[13:22] <SpeedEvil> Sponsorship by ky
[13:22] <Laurenceb_> this could be built on a bench in fact
[13:23] <Laurenceb_> piano wire with air bearings to do 180 degree turn at either end, and induction motor to drive it
[13:23] <SpeedEvil> those air bearings sound fun to make.
[13:23] <Laurenceb_> yeah lol
[13:24] <Laurenceb_> still easier than skylon
[13:24] <SpeedEvil> I wonder if replacing them with helium would help with shocks in the bearing
[13:24] <Laurenceb_> still makes more sense than hyperloop
[13:26] <Laurenceb_> the hyperloop competition was just embarrassing
[13:27] <SpeedEvil> A good first test of the Raptor would be to outfit the barge with enough raptors to lift it and a fuelled first stage to ~M1 and 20km.
[13:27] <SpeedEvil> (probably not really)
[13:27] <SpeedEvil> Though having an inch of steel between engines would add some to reliability.
[13:44] <SpacenearUS> New vehicle on the map: 03KE5LWQ-13 - 12https://tracker.habhub.org/#!qm=All&q=KE5LWQ-13
[13:45] <SpacenearUS> New vehicle on the map: 03KE5QVG-12 - 12https://tracker.habhub.org/#!qm=All&q=KE5QVG-12
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[14:31] <SpacenearUS> New vehicle on the map: 03KC9ZMJ-11 - 12https://tracker.habhub.org/#!qm=All&q=KC9ZMJ-11
[14:34] <SpacenearUS> New vehicle on the map: 03KD0NMG-11 - 12https://tracker.habhub.org/#!qm=All&q=KD0NMG-11
[14:36] <SpacenearUS> New vehicle on the map: 03SSTAR0127 - 12https://tracker.habhub.org/#!qm=All&q=SSTAR0127
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[15:32] <SpacenearUS> New vehicle on the map: 03KE8BPB-11 - 12https://tracker.habhub.org/#!qm=All&q=KE8BPB-11
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[16:03] <SpacenearUS> New vehicle on the map: 03N7ERU-11 - 12https://tracker.habhub.org/#!qm=All&q=N7ERU-11
[16:03] <SpacenearUS> New position from 03KA7NSR-7 after 034 days silence - 12https://tracker.habhub.org/#!qm=All&q=KA7NSR-7
[16:03] <SpacenearUS> New vehicle on the map: 03N7ERU-12 - 12https://tracker.habhub.org/#!qm=All&q=N7ERU-12
[16:05] <Laurenceb_> !whereis UBSEDS21
[16:05] <SpacenearUS> 03Laurenceb_: 03UBSEDS21 was over 0325.22007,-12.5309 at 0315849 meters about 0316 days ago
[16:05] <Laurenceb_> !whereis K6RPT-11
[16:05] <SpacenearUS> 03Laurenceb_: 03K6RPT-11 was over 03North Atlantic Ocean 10(32.53999,-73.16546) at 0315921 meters about 03a month ago
[16:05] <Laurenceb_> !whereis HIRFW-3
[16:05] <SpacenearUS> 03Laurenceb_: 03HIRFW-3 was over 03West Tigray, Ethiopia 10(13.48107,36.96215) at 0313999 meters about 03an hour ago
[16:08] <Laurenceb_> !whereis UBSEDS22
[16:08] <SpacenearUS> 03Laurenceb_: 03UBSEDS22 was over 03Katvaru pagasts, Latvia 10(57.58242,24.73374) at 0312203 meters about 036 days ago
[16:08] <Laurenceb_> odd iridium performance
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[16:12] <Laurenceb_> 235 days duration
[16:14] <Laurenceb_> coming up to double B-64 duration
[16:15] <digitalboy> Hi guys, I'm interested in buying the NTX2B-FA module (from the Uputronics store) however in the product page there is written that before placing an order I should be advised on the ordering options for the module, what are these options? Thank you!
[16:19] <daveake> ping Upu ^
[16:20] <Upu> Use coupon code NTX2 @check out
[16:20] <Upu> Sorry just feeding baby
[16:24] <richardeoin> Laurenceb_: iridium tracker used up its primary batteries about 7 days in, the rest is just a slightly dodgy aprs tracker
[16:24] <richardeoin> I'm still pretty happy with 2 circumnavigations with a 91g payload though
[16:25] <richardeoin> I think there's a new solar-power version of the iridium tracker in the works
[16:25] <richardeoin> with a ublox gps
[16:26] <richardeoin> so it, you know
[16:26] <richardeoin> works
[16:27] <Laurenceb_> ah cool
[16:28] <Laurenceb_> google are still only claiming 190days duration
[16:28] <Laurenceb_> dunno if they are still using polythene, I heard they set up a production line for low permeability envelopes
[16:30] <richardeoin> I suspect they don't need any more duration, and don't want any bad publicity from visible failures
[16:30] <Laurenceb_> up to 32% of the balloon flight duration record
[16:31] <Laurenceb_> not bad for amateur launches
[16:31] <Laurenceb_> their navigation software sounds interesting
[16:32] <Laurenceb_> would be cool if they actually published a paper on it
[16:32] <Laurenceb_> guess this is actually quite easy to work on with 0 budget if you have access to all the raw NOAA data
[16:36] <richardeoin> if it's your thing then getting a algorithm / ML to work in simulation is possible
[16:36] <richardeoin> imo not much fun if you can't try it out in real life
[16:37] <richardeoin> are there any ghetto methods of altitude control that might work for amateur superpressure?
[16:38] <richardeoin> adding extra heat to the envelope would have an effect, but it'd be small
[16:39] <richardeoin> I suppose you could carry ~50g of ballast and dump, but that's one-way
[16:39] <richardeoin> would still be a cool demo
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[16:44] <Laurenceb_> well I have some pumps that might work
[16:44] <Laurenceb_> but they tend to leak
[16:45] <Laurenceb_> maybe with a custom one way valve it would be doable
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[16:46] <Laurenceb_> http://ph.parker.com/us/12051/en/t2-05-micro-diaphragm-pumps-air-gas-up-to-800-mlpm
[16:47] <Laurenceb_> actually I've never tested leakage at 2psi
[16:47] <Laurenceb_> I used then at 4.5psi continuous, breaking the spec :P
[16:47] <Laurenceb_> they usually cycle at a few % duty to make up the leakage
[16:49] <Laurenceb_> 2psi is atmospheric pressure at 14km
[16:50] <richardeoin> hmm they're pretty cute
[16:50] <Laurenceb_> mine only use about 50mA at 3.6v
[16:52] <Laurenceb_> if you ran them on solar power you might be able to do 10km-15km float
[16:52] <Laurenceb_> but it would probably take about 2 days to change altitude
[16:52] <Laurenceb_> if you just ran for 6 hours per day
[16:53] <richardeoin> I don't think daytime power is a problem
[16:54] <richardeoin> nighttime is though
[16:55] <richardeoin> are the max pressure ratings the pressure across the pump?
[16:55] <richardeoin> how would you hook it up?
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[16:58] <Laurenceb_> http://www.parker.com/literature/Literature%20Files/Precision%20Fluidics%20Division/UpdatedFiles/PPF_Pumps_Catalog.pdf
[16:58] <Laurenceb_> ok so 350mW and 800ml/minute
[17:01] <Laurenceb_> maybe only 8cm square panel needed for that
[17:02] <digitalboy> Thank you very much daveake and Upu! :) Also what receiver should I be using in combination with the NTX2B? I'm planning to install the module on a HAB that should be going several kilometers up in the sky, I would like to have a robust/stable way of receiving the payload data from the onboard radio..
[17:03] <richardeoin> Laurenceb_: yup that's about right
[17:03] <Laurenceb_> hmm
[17:03] <richardeoin> would give 12h/day runtime in summer
[17:03] <Laurenceb_> depends how much you want to change altitude then
[17:04] <richardeoin> so you'd use it to pump ambient air into a ballonet?
[17:04] <Laurenceb_> if half the envelope volume is the ballonet you get a little over 5km altitude range at 14km float
[17:04] <Laurenceb_> yeah
[17:04] <Laurenceb_> so with UBSEDS22 envelope I get about 3 days of pumping
[17:05] <dbrooke> digitalboy: have a read of https://ukhas.org.uk/guides:tracking_guide
[17:05] <Laurenceb_> I'm not sure how long the pump mechanism lasts, some of mine are up to about 100hours continuous
[17:05] <Laurenceb_> no failures out of a few hundred pumps
[17:06] <Laurenceb_> one of my solenoid valves failed, but that was about 2 years old and had had little use
[17:07] <Laurenceb_> google use brushless motors and centrifugal pumps
[17:08] <Laurenceb_> you could use these to vent the air http://ph.parker.com/us/12051/en/x-valve-miniature-pneumatic-solenoid-valve
[17:12] <Laurenceb_> http://aldax.se/wp-content/uploads/2012/07/X-Valve.pdf
[17:12] <Laurenceb_> grrr
[17:12] <Laurenceb_> vent rate only ~0.4litres/minute
[17:14] <Laurenceb_> aha http://ph.parker.com/us/12051/en/series-lx-miniature-latching-pneumatic-solenoid-valve/915-000001-005
[17:15] <Laurenceb_> that could be latched and left overnight
[17:16] <richardeoin> yup you could pump during the day and then latch overnight
[17:17] <richardeoin> as a simple test
[17:17] <richardeoin> I have no intention of doing this myself, it's quite interesting though
[17:19] <Laurenceb_> I've used most of these parts for work projects
[17:19] <Laurenceb_> horribly overpriced by they get the job done
[18:03] <SpacenearUS> New position from 03WB8ELK-1 after 0310 days silence - 12https://tracker.habhub.org/#!qm=All&q=WB8ELK-1
[18:06] <SpacenearUS> New position from 03KJ4TDM-11 after 037 days silence - 12https://tracker.habhub.org/#!qm=All&q=KJ4TDM-11
[18:15] <SpacenearUS> New position from 03N4XWC-1 after 037 days silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[18:22] <SpacenearUS> New vehicle on the map: 03DC2EH-11 - 12https://tracker.habhub.org/#!qm=All&q=DC2EH-11
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[19:02] <SpacenearUS> New vehicle on the map: 03LU1ESY-15 - 12https://tracker.habhub.org/#!qm=All&q=LU1ESY-15
[19:37] Nick change: Htbrdd_ -> Htbrdd
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[19:58] <SpacenearUS> New vehicle on the map: 03KI7LAZ-1 - 12https://tracker.habhub.org/#!qm=All&q=KI7LAZ-1
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[20:00] <M0RJX> OOh it's been a while
[20:01] <M0RJX> Been working on a RN2483 hat for the pie.
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[20:13] <SpacenearUS> New position from 03HIRFW-6 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
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[20:29] <SpacenearUS> New vehicle on the map: 03KN4BKZ-1 - 12https://tracker.habhub.org/#!qm=All&q=KN4BKZ-1
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[22:10] <laurence_> _
[22:10] Nick change: laurence_ -> Laurenceb_
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[23:24] <SpacenearUS> New position from 03IK8SUT-11 after 035 days silence - 12https://tracker.habhub.org/#!qm=All&q=IK8SUT-11
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[00:00] --- Sun Apr 16 2017