UmbralRaptor 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
egg|anbo|egg has joined #kspacademia
* raptop stabs a headache, and wonders if this is another cold
<egg|anbo|egg> iximeow: hm the sky looks kinda clear
<egg|anbo|egg> but my knee hurts so I'm not going to lug the scope out
<raptop> !8 is egg|anbo|egg getting old?
<galois> raptop: no
<egg|anbo|egg> raptop: stacked 5 steres of wood
<iximeow> egg|anbo|egg: let me know how betelgeuse looks!!
<egg|anbo|egg> raptop: so i think it's lifting cartloads of wood rather than age
<egg|anbo|egg> iximeow: okay I'll take a look
<raptop> !wa 1 stere in cords
<raptop> ;wa 1 stere in cords
<kmath> raptop: convert 1 stère to cords: 0.2759 cords
<raptop> cursed units
<raptop> ;wa 1 stere in cubic meters
<kmath> raptop: convert 1 stère to cubic meters: 1 m^3 (cubic meter)
<raptop> ah
<raptop> wait, that's like 5 tonnes
<egg|anbo|egg> ;wa 5 steres in cords
<kmath> egg|anbo|egg: convert 5 stères to cords: 1.379 cords
<egg|anbo|egg> raptop: the cord is the right kind of unit, in that it also measures stacked wood including air (although contrary to the stere it seems less specific about the length of the logs)
<egg|anbo|egg> the stere is specifically to be measured in 1 m logs, because in 50 cm logs you get 0,8 m^3 once stacked (more logs means it packs more densely)
<egg|anbo|egg> iximeow: hm, it's clouding over actually
<iximeow> boo
<egg|anbo|egg> iximeow: seems markedly dimmer than Procyon, modulo clouds, which is not super useful data
<raptop> No, bad clouds
<raptop> Hrm. Is Aldebaran visible?
<egg|anbo|egg> not from my bed
<egg|anbo|egg> let me go out and have a look again
<raptop> Obviously there's Rigel, but I'd like to compare against another orange/red star
<egg|anbo|egg> raptop: clouds
* raptop ponders pollux
* raptop stabs the sky?
<egg|anbo|egg> either it's clouds or betelgeuse has blown up, as well as everything else
<egg|anbo|egg> raptop: isn't rigel much brighter?
<egg|anbo|egg> anyway, clouds
<raptop> egg|anbo|egg: I want to say it's filter dependent
<egg|anbo|egg> aaa
<raptop> Yeah, it's very filter dependent. Only ~0.3 mags in V band
<raptop> B8 vs M1-2, so that's to be eggspected
<raptop> If I'm reading simbad correctly, Betelgeuse is brighter in R through K, whil Regulus is a lot brighter in U and B
* raptop ponders finding bolometric figures
<egg|anbo|egg> > raptop wait, that's like 5 tonnes
<egg|anbo|egg> hm I wonder how heavy it is
<egg|anbo|egg> I also stacked it on top of used kitty litter to keep it dry (mud rots logs fast), so I also carted that around
<egg|anbo|egg> raptop: apparently a stere is about 500 kg in dry wood
<egg|anbo|egg> raptop: so 2 and a half tonnes of wood, I guess
<raptop> hm
<raptop> less dense than I thought
raptop has quit [Ping timeout: 190 seconds]
<egg|anbo|egg> raptop: it's logs, not cubes; there's a lot of air
<egg|anbo|egg> or UmbralRaptop
<UmbralRaptop> cubic logs
<egg|anbo|egg> but cat she read Russian, the third human language https://twitter.com/sigfig/status/1208183875991674882
<kmath> <sigfig> i can read french when mathematicians are talking about math, or when philosophers are talking about philosophy, but in no other context
e_14159 has quit [Ping timeout: 190 seconds]
e_14159 has joined #kspacademia
<egg|anbo|egg> B787_300: any idea why Ariane 4 2nd stage used cold-gas ullage pressurization (PGF) with helium, while it used hot-gas (PGC) for the 1st stage (and the PALs) with GG exhaust mixed with water?
<B787_300> nope
<B787_300> maybe to simplify construction
<egg|anbo|egg> hm
<egg|anbo|egg> B787_300: the 2nd stage is single-engine, so uses GG exhaust to control roll
<B787_300> heat exchangers are a pain and you need lots of piping to get from the gas bottles to the engine then back, also for expander cycle engines all heat is needed to drive the turbine
<B787_300> oh S2 is GG
<egg|anbo|egg> yeah
<egg|anbo|egg> it's all Vikings
<egg|anbo|egg> would roll control use too much of the exhaust to pressurise with the rest?
<B787_300> wait they were taking turbine exhasut mixing with water to pressurize the tanks!
<B787_300> because unless there are diaphragms that sounds like a TERRIBLE idea
<egg|anbo|egg> it worked, apparently
<egg|anbo|egg> remarkably well even
<egg|anbo|egg> B787_300: and the PAL, with more detail in the PGC http://www.capcomespace.net/dossiers/espace_europeen/ariane/ariane4/viking%20PAL%20schema%2002.JPG
<egg|anbo|egg> there are check valves, but that's all
<egg|anbo|egg> CAR* are check valves
<B787_300> what is DGC
<egg|anbo|egg> hot gas expander
<B787_300> egg|anbo|egg: i dont speak french
<egg|anbo|egg> s/expander/regulator/
<galois> egg|anbo|egg meant to say: hot gas regulator
<B787_300> also GGC?
<egg|anbo|egg> hot gas generator
<egg|anbo|egg> it's the GG
<egg|anbo|egg> (DGC is literally "hot gas relaxer", it's regulator in the same sense as diving regulator, a thing that lowers pressure)
<B787_300> yeah that is wierd as hell to me
<B787_300> because i could see some weird interactions with any unburned propellants
<egg|anbo|egg> yeah the hot gas pressurization is unique afaik
<egg|anbo|egg> yeah that definitely sounds like a fun problem
<B787_300> hot gas isnt unique. but normally it is nitrogen or helium
<kmath> <alt_kia> oh the gas generator exhaust (diluted with water) also gets used to pressurize the main fuel/oxidizer tanks; hopefu… https://t.co/lHAHx8Qruq
<egg|anbo|egg> B787_300: well, hot as in "exhaust"
<B787_300> i mean the hotter the gas is the less you need to carry
<egg|anbo|egg> right
<egg|anbo|egg> B787_300: I mean the reason why you don't run your GG stoichiometric is temperature, here the GG has water injected right in the chamber, so I guess they might be getting around it like that?
<B787_300> http://www.capcomespace.net/dossiers/espace_europeen/ariane/ariane4/viking%20L220%20schema%2002.JPG this one looks like there is a bulkhead between the UDMH and water which makes sense
<egg|anbo|egg> B787_300: yes, but that's just the water tank
<egg|anbo|egg> interestingly the water tank in the 1st stage also feeds the liquid boosters
<B787_300> yeah but you are carring dead water with you killing your payload fraction
<egg|anbo|egg> aspargus water
<egg|anbo|egg> well yes, but less dead helium
<B787_300> but HE is lighter
<B787_300> plus non reactive
<egg|anbo|egg> sure but you only have enough water to cool, the bulk volume of the ullage pressurant should be exhaust
<B787_300> you need to have extra for contingincies
<egg|anbo|egg> yeah, but I mean it's not directly comparable to the amount of He
<egg|anbo|egg> the odd thing is that they went with a different design on the 2nd stage
<egg|anbo|egg> so there must be some tradeoff going on that is different for 1st and 2nd stage that leads to choosing between PGC and PGF
<egg|anbo|egg> no that's the liquid booster
<egg|anbo|egg> which gets its water from the core, aspargus-style :-p
<B787_300> oh
<B787_300> i was wonderiny why it didnt cary its own water
<egg|anbo|egg> much less water, only enough to cool the GG since it's not used for pressurization
<egg|anbo|egg> s/GG/GGC/ I guess
<galois> egg|anbo|egg meant to say: much less water, only enough to cool the GGC since it's not used for pressurization
<B787_300> yeah S2 uses a standard Helium system it looks like
<egg|anbo|egg> yeah
<egg|anbo|egg> and steamed GGC exhaust for roll control (SCR)
<egg|anbo|egg> B787_300: interestingly since S2 bothers with having helium tanks and a pressurization system, it also uses it for the water tank
<egg|anbo|egg> whereas S1 has a water tank pre-pressurized with nitrogen
<B787_300> what are VDH, DPH, DSH (H is helium i know)
<egg|anbo|egg> startup helium valve VDH
<egg|anbo|egg> primary helium regulator DPH
<egg|anbo|egg> secondary helium regulator DSH
<B787_300> ugh that would make the tank heavy as it needs to hold the pressure, where as the prop tanks are normally held at a lower pressure just to stop cavitation on the pumps
<egg|anbo|egg> yeah (then again a helium tank would also need to be heavy and pressurized)
<egg|anbo|egg> so the water tank isn't that big, and it's a common bulkhead
<egg|anbo|egg> iximeow: UmbralRaptop: moon behind lots of clouds above the horizon
egg|anbo|egg has quit [Remote host closed the connection]
mofh has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
egg|anbo|egg has quit [Ping timeout: 204 seconds]
egg|anbo|egg has joined #kspacademia
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
mofh has joined #kspacademia
<egg|anbo|egg> !wpn mofh_
* galois gives mofh_ a merlin with an ocelot attachment
<egg|anbo|egg> kitty
<mofh> miaou~
<egg|anbo|egg> !wpn whitequark
* galois gives whitequark a linear linter with a decagon attachment
egg|anbo|egg has quit [Remote host closed the connection]
<mofh> !u ␥
<galois> ␥: U+2425 SYMBOL FOR DELETE FORM TWO
<egg|cell|egg> !u ␡
<galois> No info for U+0002 (I only know about Unicode up to 9.0)
<galois> ␡: U+2421 SYMBOL FOR DELETE
<galois> No info for U+000f (I only know about Unicode up to 9.0)
<galois> No info for U+0003 (I only know about Unicode up to 9.0)
<galois> 9: U+0039 DIGIT NINE
<galois> 9: U+0039 DIGIT NINE
<galois> ,: U+002c COMMA
<galois> 9: U+0039 DIGIT NINE
<galois> 9: U+0039 DIGIT NINE
<egg|cell|egg> !u ␡
<galois> No info for U+0002 (I only know about Unicode up to 9.0)
<galois> ␡: U+2421 SYMBOL FOR DELETE
<egg|cell|egg> !u ␥
<galois> ␥: U+2425 SYMBOL FOR DELETE FORM TWO
egg|anbo|egg has joined #kspacademia
egg|anbo|egg has quit [Remote host closed the connection]
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has joined #kspacademia
egg|anbo|egg has joined #kspacademia
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
<egg|anbo|egg> whitequark: https://twitter.com/whitequark/status/1208398114173935629 at least your walls seem to be holding up so far
<kmath> <whitequark> told roommate#2 how Intel High Definition Audio works internally and she took my ethanol canister, poured some into… https://t.co/Dn5VWpLdvK
<whitequark> walls/
<whitequark> ?
<mofh> also your eleggtrical wiring
<egg|cell|egg> Whitequark: didn't racoon roommate punch a wall after hearing about USB
<_whitenotifier-d13c> [Principia] sthalik commented on issue #2385: Check for the C++ redistributable in the main menu - https://git.io/JedrN
<UmbralRaptop> I'm getting the impression that computers are powered by a bunch of safe/euclid class SCPs
<mofh> UmbralRaptop: same, or rather I've had that impression for awhile
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
<whitequark> egg|cell|egg: thats roommate#1
<whitequark> not #2
<egg|anbo|egg> right
<egg|anbo|egg> are the cats similarly indexed
egg|anbo|egg has quit [Remote host closed the connection]
<whitequark> hm.
<whitequark> were not but they are now.
<egg|cell|egg> Whitequark: same address space or is your flat segmented
<egg|cell|egg> LPCAT
<whitequark> >is your flat segmented
<whitequark> i think this segfaulted my parser
<egg|cell|egg> Flat = apartment
<whitequark> yes i know
<egg|cell|egg> And segmented memory
<egg|cell|egg> But yes this sounds weird
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has joined #kspacademia
<egg|cell|egg> !wpn -add:adj segmented
<galois> Added adj 'segmented'
<egg|cell|egg> !wpn whitequark
* galois gives whitequark a segmented polygon
<UmbralRaptop> egg|cell|egg: are you using linguistics to fuzz whitequark?
egg|anbo|egg has joined #kspacademia
egg|anbo|egg_ has joined #kspacademia
egg|anbo|egg has quit [Ping timeout: 378 seconds]