highaltitude.log.20210721

[01:35] <SpacenearUS> New position from 03BSS38 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS38
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[05:28] <SpacenearUS> New position from 03K4UAH-6 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K4UAH-6
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[07:26] <SpacenearUS> New position from 034FSKTEST after 038 hours silence - 12https://tracker.habhub.org/#!qm=All&q=4FSKTEST
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[11:16] <SpacenearUS> New vehicle on the map: 03cagiva - 12https://tracker.habhub.org/#!qm=All&q=cagiva
[11:24] <SpacenearUS> New vehicle on the map: 03BSS39 - 12https://tracker.habhub.org/#!qm=All&q=BSS39
[11:34] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
[11:51] <SpacenearUS> New vehicle on the map: 03ARNIE_Chase - 12https://tracker.habhub.org/#!qm=All&q=ARNIE_Chase
[12:20] <SpacenearUS> New position from 03VE3OCL-19 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=VE3OCL-19
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[12:22] <SpacenearUS> New vehicle on the map: 03ES3BEC-11 - 12https://tracker.habhub.org/#!qm=All&q=ES3BEC-11
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[12:46] <SpacenearUS> New vehicle on the map: 03UCSBOL - 12https://tracker.habhub.org/#!qm=All&q=UCSBOL
[12:47] <chris_99> Hi, i'm just wondering , i was reading a plane expends more fuel at higher altitudes, i don't really understand why that is, does a plane have to fly faster at higher altitudes to maintain the same height?
[12:50] <chris_99> oh that doesn't seem correct re. expending more fuel. jet engines are apparently more efficient at higher altitudes
[12:58] <daveake> UCS launch stream is live https://www.youtube.com/watch?v=1vM4x2I4Hhc
[13:03] <fsphil> 28c. toasty
[13:16] <daveake> very
[13:30] <SpacenearUS> New position from 03N4KGL-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4KGL-11
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[13:49] <SpacenearUS> New vehicle on the map: 03SV3IRG-4FSK - 12https://tracker.habhub.org/#!qm=All&q=SV3IRG-4FSK
[13:49] <eor> jet engines are most efficient at cruise altitude. however, the optimal cruise altitude varies depending on weight
[13:50] <eor> on longer routes, pilots often perform a "step climb" procedure so that they gradually request higher flight levels as they burn fuel and lose weight
[13:52] <chris_99> ah, that's interesting re. step climb. for a 'turboprop' it sounds like they maybe become less efficient i think?
[13:52] <eor> yes, a propeller does not perform that well in thin air
[13:53] <eor> also turboprop aircraft generally cover much shorter distances routes anyway
[13:53] <chris_99> i was reading this - https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft#Altitude that made it sound like the engine itself becomes less efficient due to the lower temp?
[13:54] <eor> on some turboprop routes it doesn't even make sense to climb very high since you'd have to start descent almost immediately
[13:55] <eor> and I imagine you also have to factor in how much more fuel it takes to climb
[13:59] <SpacenearUS> New vehicle on the map: 03KI5JSU-9 - 12https://tracker.habhub.org/#!qm=All&q=KI5JSU-9
[14:02] <eor> well, the engine thrust decreases with altitude but so does the aircraft drag. I suppose the lowered drag still counts for more, until some point where the thin air becomes too much for the engine
[14:04] <eor> at some altitude the engines simply can't produce enough thrust to maintain level flight. or, alternatively, if you try to push the engines too hard they flame out
[14:04] <eor> I am probably oversimplifying things way too much since I'm really not an expert.
[14:05] <chris_99> that's a good point re. drag / thrust. what's flame out mean? it just can't perform combustion?
[14:06] <eor> the air is so thin it can't compress air enough to maintain combustion
[14:06] <SpacenearUS> New vehicle on the map: 03KI5JSU-10 - 12https://tracker.habhub.org/#!qm=All&q=KI5JSU-10
[14:08] <chris_99> aha gotcha
[14:09] <eor> there's basically not enough oxygen available
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[16:00] <SpacenearUS> New vehicle on the map: 03KF5IWW-11 - 12https://tracker.habhub.org/#!qm=All&q=KF5IWW-11
[16:10] <SpacenearUS> New position from 03W8VPV-1 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W8VPV-1
[16:33] <SpacenearUS> New vehicle on the map: 03ARNIE_Chase - 12https://tracker.habhub.org/#!qm=All&q=ARNIE_Chase
[16:35] <SpacenearUS> New vehicle on the map: 03LCARS_chase - 12https://tracker.habhub.org/#!qm=All&q=LCARS_chase
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[17:17] <SpacenearUS> New position from 03NOB8 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB8
[17:20] <chris_99> just saw - https://english.elpais.com/spain/2021-07-15/spanish-police-seize-large-drone-used-to-carry-drugs-from-morocco.html / https://www.muginuav.com/product/mugin-5-pro-5000mm-super-large-vtol-uav-platform/ today. the drone itself looks quite interesting, wrt the vertical take-off aspect
[17:25] <daveake> Flight retrieved 😃
[17:26] <chris_99> :) what altitude did it get to?
[17:28] <PE2BZ> 35300 m and a bit
[17:52] <daveake> About 3km higher than expected!
[17:53] <chris_99> silly question, since it was so hot today, does the heat make it rise faster at all?
[17:53] <daveake> Between that, being a bit slow ascending initially and faster later, plus not quite following prediction anyway, we were lucky that it managed to land on ground in the Forest of Dean!
[17:53] <SpacenearUS> New position from 03SP6QKM-12 after 0313 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP6QKM-12
[17:53] <SpacenearUS> New position from 03SP6QKM-4FSK after 0314 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP6QKM-4FSK
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[18:25] <SA6BSS-Mike> no, the incresed speed at altitude is due to the fact its less air and less drag, so there is always an increase in accent rate the higher a payload goes
[18:40] <SpacenearUS> New vehicle on the map: 03KO4DTP-1 - 12https://tracker.habhub.org/#!qm=All&q=KO4DTP-1
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[21:32] <SpacenearUS> New vehicle on the map: 03PC4L-R - 12https://tracker.habhub.org/#!qm=All&q=PC4L-R
[21:34] <SpacenearUS> New vehicle on the map: 03PC4L-L - 12https://tracker.habhub.org/#!qm=All&q=PC4L-L
[21:45] <SpacenearUS> New vehicle on the map: 03KJ7WWF-11 - 12https://tracker.habhub.org/#!qm=All&q=KJ7WWF-11
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[23:10] <SpacenearUS> New position from 03N4XWC-1 after 038 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[00:00] --- Thu Jul 22 2021