raptop changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
UmbralRaptop has quit [Read error: Connection reset by peer]
<kmath>
<cosmos4u> Sorry, no #occultation of #Sirius by a small #asteroid for the U.S.: "The path of the event for the Sirius A (mag -… https://t.co/Cqy9GIixeg
<B787_300>
anyone know how hot you have to heat lunar regolith to vitirify it?
<B787_300>
i want to know how big of a orbiting parabolic mirror you need to vitrify a nice landing pad
<B787_300>
or if it would be doable with a nice large laser
<bofh>
B787_300: so let's use standard sand as a baseline, since I'm pretty sure lunar regolith is to first order silicates
<bofh>
I'm fairly certain vitriying sand via laser is nontrivial, at least at scale.
<B787_300>
and that was with a solar furnace of 3.2 m
<B787_300>
s/3.2/3.0 m in dia
<galois>
B787_300 meant to say: and that was with a solar furnace of 3.0 m in dia m
<B787_300>
but they had spallation which might defeat the purpose
<bofh>
Wait, why would that defeat the purpose?
<B787_300>
when landing on the moon there is no noticable atmo to slow down debris kicked up by the landing
<bofh>
Okay, true.
<B787_300>
which could fly around the moon and destroy shit at or near the antipode of landing or things in low lunar orbit
<B787_300>
now the solution is reasonably trivial... make a permanent landing pad
<B787_300>
but the question is HOW to do it with out kicking up all the dust trying to land stuff
<B787_300>
an orbiting mirror was a though i had to vitirfy the landing zone
<B787_300>
s/though/thought
<galois>
B787_300 meant to say: an orbiting mirror was a thought i had to vitirfy the landing zone
<B787_300>
but if you need 400 W/cm^2 that is really hard to do while still being accurate with the pointing
<B787_300>
(also talk about a nice weapon if you want to destroy other peoples shit)
<bofh>
Do you still need a high degree of pointing accuracy?
<B787_300>
i would think so as you are trying to only glass a small portion of the moon
<bofh>
I mean your beamwidth isn't going to be *that* big
<B787_300>
another thing you need is a slight dish or bowl effect in the LZ to deflect all the exhaust gas up. if it gets shot out to the sidethen you will dig out the regolith to the sides of the pads (and possibly shoot stuff at your hab
<B787_300>
)
<B787_300>
or a lip on the LZ
<B787_300>
ironically this is one thing that trying to land on mars is much easier
<B787_300>
i guess you could always land a smaller light rover first and use it to bind regolith into a LZ
<B787_300>
as the amount kicked up is proportional to the weight of the lander
<bofh>
I mean aerobraking on Mars is still, like, not really a thing.
<bofh>
cf. Six Minutes of Terror
<B787_300>
yeah it is... MAVEN and most of the other Oribiters aerobraked
<B787_300>
aerobraking to a landing is a different thing that HIAD should solve
<B787_300>
or super/hupersonic retro propulsion which SpaceX has been messing around with for the last 3-4 years
<B787_300>
but really i was just talking about the dust kicked up on landing issue not the getting to that point
<bofh>
I mean okay, yes, that's what I meant, oops.
<B787_300>
actually is there an epoxy that can withstand the temp of a rocket engine?
<B787_300>
becuase most epoxies dont need air to set
<B787_300>
plus with an epoxy route and a specialized drill you could make essentially foundation piles under the landing pad to help it support even more weight
<B787_300>
and it would be easier to shape the pad the way you wanted in 3d profile
<bofh>
03:15:01 <@B787_300> actually is there an epoxy that can withstand the temp of a rocket engine?
<bofh>
I'm tempted to say "no" but I've run into some frighteningly temperature-resistant phenolic epoxies
<whitequark>
is that like ablative
<UmbralRaptop>
Troll answer: well, GEM SRBs are a thing, right?
<whitequark>
it sounds ablative fundamentally
<whitequark>
maybe with expansion
<B787_300>
well we are talking moon landing so the expansion ratios would be like 100-200
<B787_300>
ugh all the epoxies i am finding for that temp range need water to activate and have a pretty strict cure schedule
<B787_300>
and while it would be possible to use a essentially a large sunshade with various optical densities to regulate the temp it would be a pain
<B787_300>
and that is before moving all that water to surface to mix with the epoxy
<B787_300>
and if i am going to have a sunshade why not be like a kid and use a large magnifying glass
<bofh>
SC21AF... huh.
<bofh>
Okay that's the CRS Command Word opcode, so not *too* helpful w/o knowledge of what it's actually being changed from and to. Still, I *really* want a damn copy of 618-505.
<egg>
meow
<egg>
bofh: so have you found anything re. these covariances
egg|zzz|egg has joined #kspacademia
<_whitenotifier>
[Principia] pleroy opened pull request #2077: Fix the version script: just say no to CP850 - https://git.io/fh5CW
<kmath>
<LiaSae> To be fair this WAS a bit of an experiment into how much cheese you can put in a bread before it stops being struct… https://t.co/ocn8FwYbDc
<SnoopJeDi>
art is alive and well
<SnoopJeDi>
!wpn bofh, egg, et al.
* galois
gives bofh, egg, et al. a RPN soufflé
<SnoopJeDi>
!wpn -add:wpn eigenvector
<galois>
Added wpn 'eigenvector'
<SnoopJeDi>
!wpn -add:adj pathological
<galois>
Added adj 'pathological'
<SnoopJeDi>
probably broken but it's a thing ¯\_(ツ)_/¯
<bofh>
SnoopJeDi: now I'm imagining a soufflé containing an HP-15C inside
* bofh
is now reminded of that one galette des rois where the relevant item in it was a random power N-channel MOSFET we had lying around, lol.
<SnoopJeDi>
To be fair, that WAS a bit of an experiment into how much computer science you can put in a bread before it stops being structurally sound.
<SnoopJeDi>
s/bread/puff/
<galois>
SnoopJeDi meant to say: To be fair, that WAS a bit of an experiment into how much computer science you can put in a puff before it stops being structurally sound.
egg|zzz|egg has quit [Read error: Connection reset by peer]
egg|zzz|egg has joined #kspacademia
<SnoopJeDi>
bofh, I think that the mail may have eaten your postcard if you've already sent it btw :/
<bofh>
SnoopJeDi: argh. like I sent it very late in the year, so I'd give it another week or two
<SnoopJeDi>
mkay!
<SnoopJeDi>
so, that notion I had to make a Telemachus-aware KSP mapview-alike in Three.js has turned into a phone call next week with a startup that makes a satellite OS and mission control software o.O
<SnoopJeDi>
one of the devs at the company found the concept said "hey wanna interview with us?" basically
egg|zzz|egg has quit [Ping timeout: 198 seconds]
egg|zzz|egg has joined #kspacademia
<egg>
!wpn whitequark
* galois
gives whitequark a Hermitian morphism
<egg>
!wpn bofh
* galois
gives bofh a divergent adjoint trout with a plotter attachment
<egg>
UmbralRaptop: phl: it is commonly said that there are only two forms of life on Kerbin, grass and Kerbals; but there's a third one, the birds you hear in the space centre view
<UmbralRaptop>
egg: kerbin's trees are no longer eggstinct~
<egg>
hm
<egg>
UmbralRaptop: but still, birbs
<egg>
!wpn UmbralRaptop
* galois
gives UmbralRaptop a plotter
<egg>
!wpn SnoopJeDi
* galois
gives SnoopJeDi a logarithmic graph
<egg>
!wpn -add:wpn botfly
<galois>
Added wpn 'botfly'
<UmbralRaptop>
!wpn egg
* galois
gives egg a discrete isomorphic rubber chicken
<SnoopJeDi>
I pre-seeded it with a bunch of garbage, but it understands -del:wpn and -del:adj too fwiw
<egg|zzz|egg>
bofh: are the R01 through R26 ГЛОНАСС satellites and the G01 through G32 GPS satellites?
* egg|zzz|egg
stares at the SP3 file
<egg|zzz|egg>
oh no, there are only P records, no V records, this is unusable
<galois>
[WIKIPEDIA] Six-bit character code#GOST 6-bit code | "A six-bit character code is a character encoding designed for use on computers with word lengths a multiple of 6. Six bits can only encode 64 distinct characters, so these codes generally include only the upper-case letters, the numerals, some punctuation characters, and sometimes control characters..."