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The Delta IV rocket is one of the two rockets that came from the Evolved Expendable Launch Vehicle program (aka "If Boeing and Lockheed Martin won't stop suing each other, we'll make them work together!") For those not familiar with rocket science, the simple way to increase payload mass is to use more rocket to lift it. The first stage of the Delta IV is called the Common Booster Core.  The Delta IV has variants that use anywhere from 1 to 5 strap-on solid rocket boosters to boost larger mass payloads to orbit. Here's one with two solid rockets  In its largest form, the Delta IV heavy leaves those boosters behind and simply uses 3 Common Booster Cores. The outside ones run at full throttle and the center one is throttled down to conserve fuel for when the weight of the extra two boosters has been thrown off.  In its Heavy configuration, the Delta IV prepares for launch by, at T-7, purging and cooling the engines with a burst of hydrogen fuel (going from cryogenic to gaseous takes a huge amount of energy and cools everything around it.) This leaves the problem of a massive cloud of hydrogen gas around the rocket; the gas is ... Promptly  Burned   Off  The orange paint on the fuel tanks is formulated to attract free hydrogen in the atmosphere and to hold it there burning in a controlled manner rather than risk forming bubbles or pockets of hydrogen in the atmosphere that could explode. The rocket is supposed to be on fire. It's a safety feature. With what may be the final flight of the Delta IV Heavy nearing, I urge all of you to watch the test flight and reentry of the Orion Module on December 4 (check the Spaceflight megathread in Sciences, Academics, and Languages for further info.) GWBBQ has a new favorite as of 03:57 on Nov 19, 2014 |
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Nov 18, 2014 04:25
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GWBBQ posted:This leaves the problem of a massive cloud of hydrogen gas around the rocket; the gas is ... Wait wait wait... They douse the rocket in liquid hydrogen, and then ignite that hydrogen, for a net decrease in temperature? Really illustrates the difference in heat transfer between liquids and gasses.
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Nov 20, 2014 08:24
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GWBBQ posted:The orange paint on the fuel tanks is formulated to attract free hydrogen in the atmosphere and to hold it there burning in a controlled manner rather than risk forming bubbles or pockets of hydrogen in the atmosphere that could explode. I was reading along, looking at the pictures and thinking "why the gently caress do they bother painting it if it's going to be on fire a second later", and hit your explanation right on cue. Science is loving amazing.
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Nov 20, 2014 14:19
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Chamale posted:Wait wait wait... They douse the rocket in liquid hydrogen, and then ignite that hydrogen, for a net decrease in temperature? Really illustrates the difference in heat transfer between liquids and gasses. No, they vent liquid hydrogen through channels between the inner and outer walls of the rocket nozzles to cool them, which then ignites via atmospheric oxygen when the rocket motors ignite. Space Shuttle Main Engines do the same thing with a closed system that routes the hydrogen from the fuel tanks, through the rocket nozzles, then through the turbopumps to the engine combustion chambers. The flame temperature is so hot that you have to have an actively cryogenicly cooled nozzle made of the highest temperature alloy that we know of just to keep it from melting during operation. Even more  , the inner wall of the RS-68 engine is designed to slowly burn away while the engine is running. The carbon-rich exhaust gives the plume a yellow color, in comparison to the transparent flame from the SSME, even though both engines use the same fuel. Who cares if you partially slag your motor if you're just going to throw it into the sea when you're done, right?
CommanderApaul has a new favorite as of 16:12 on Nov 20, 2014 |
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Nov 20, 2014 16:07
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G'drat, space and everything we do it in it so loving  Above: Austronaut Bruce McCandless tests his space suit's human poop capacity.
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Nov 20, 2014 21:39
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JoelJoel posted:G'drat, space and everything we do it in it so loving "Eat up, Jimmy. Oh, and there's this chocolate milk too." "Chocolate milk? I didn't know we had chocolate milk." "Yeah, or would you rather have strawberry? Just have it all and go on this spacewalk for us, okay?" "What do you want me to do out there?" "Oh, you know, whatever comes naturally." Yeah, space stuff is genuinely the most badass poo poo us humans do. The only human not in this picture, including those that have ever lived, is Michael Collins: 
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Nov 20, 2014 21:59
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Oil well fire extinguisher:
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Nov 20, 2014 22:07
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Taeke posted:
One of the only times a selfie would have been acceptable.
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Nov 20, 2014 22:43
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Pneub posted:Oil well fire extinguisher: Nice try 40k junkie, but fool me once...
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Nov 20, 2014 22:59
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 The God of all lunatics everywhere.
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Nov 20, 2014 23:12
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 This is the High Pressure Oxygen Turbopump from the Space Shuttle Main Engine. It's sole job is to pump liquid oxygen from the low pressure oxygen system into the high-pressure system and feed it into the combustion chamber. It has a power output of over 23,000 horsepower. CommanderApaul has a new favorite as of 00:10 on Nov 21, 2014 |
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Nov 20, 2014 23:58
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Q!=e, phone posting
CommanderApaul has a new favorite as of 00:11 on Nov 21, 2014 |
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Nov 21, 2014 00:09
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Variant_Eris posted:
You might need to explain that one a bit- not everyone has read every scrap of copypasta.
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Nov 21, 2014 00:09
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Old Man Henderson
Variant_Eris has a new favorite as of 00:35 on Nov 21, 2014 |
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Nov 21, 2014 00:33
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Nov 21, 2014 01:07
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Variant_Eris posted:
I don't get it. Yeah, I am not reading that.
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Nov 21, 2014 05:17
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Pneub posted:Oil well fire extinguisher: Yeah, we use jet engines to blow out the fire, no biggie! https://www.youtube.com/watch?v=nM3IDkIzp2w
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Nov 21, 2014 06:34
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Pneub posted:Oil well fire extinguisher: Is that a literal tank chassis that's mounted on?
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Nov 21, 2014 06:41
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Tracula posted:Is that a literal tank chassis that's mounted on? Yup, the good old T-34 no less.
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Nov 21, 2014 06:44
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Nordick posted:Yup, the good old T-34 no less. It's actually two MiG engines strapped to the T-34, for added badass. funtax has a new favorite as of 07:00 on Nov 21, 2014 |
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Nov 21, 2014 06:50
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funtax posted:It's actually two MiG engines strapped to the T-34, for added badass. See, we can create this for good, but nothing else Red Alert-esque?! I demand Mammoth Tanks within the next 2 years damnit.
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Nov 21, 2014 07:52
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GWBBQ posted:The orange paint on the fuel tanks is formulated to attract free hydrogen in the atmosphere and to hold it there burning in a controlled manner rather than risk forming bubbles or pockets of hydrogen in the atmosphere that could explode. I mean, I guess it makes sense (aside from your explanation) considering they can't seem to not set them on fire anyway.
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Nov 21, 2014 07:58
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Solice Kirsk posted:See, we can create this for good, but nothing else Red Alert-esque?! I demand Mammoth Tanks within the next 2 years damnit.  The Americans also made a 'Super Ontos' around the same time, with 2 105mm guns/recoilless rifles in an unmanned(?) turret.  And finally Russians made the 2S35 Koalitsija-SV in ~2005. People are on this, man. 
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Nov 21, 2014 08:16
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Malleum posted:Does it count if it doesn't have a turret? Because West Germany made this in the 70's. I'm not seeing anti-air missiles on any of these...AWAITING ORDERS!
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Nov 21, 2014 10:30
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Nov 21, 2014 14:10
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Is that a wolverine? e: no it's a polar bear haha
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Nov 21, 2014 16:46
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Sled dog.
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Nov 21, 2014 17:22
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Taeke posted:"Eat up, Jimmy. Oh, and there's this chocolate milk too." The Terrible Secret of Space is that if you even breath in the wrong direction you are totally and utterly hosed.
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Nov 23, 2014 00:43
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Choco1980 posted:The Terrible Secret of Space is that if you even breath in the wrong direction you are totally and utterly hosed. I love those religious e-mails talking about the universe being custom tailored for humans
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Nov 23, 2014 13:59
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 "Georgian Khevsur anarchists arriving to fight against the Soviet Army, 1921"
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Nov 23, 2014 14:26
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That one guy appears to be wearing medieval armor. The Russian Civil War was weird.
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Nov 23, 2014 14:37
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ekuNNN posted:
There has never been a more hardcore ugly sweater party.
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Nov 23, 2014 14:40
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Bury me under a naked woman! Best headstone ever.
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Nov 25, 2014 04:30
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Say Nothing posted:Bury me under a naked woman! Looks like she was killed by Goldfinger's younger, poorer brother, Concretefinger.
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Nov 25, 2014 05:49
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Buttonhead posted:Looks like she was killed by Goldfinger's younger, poorer brother, Concretefinger. Haha. That or Carbonitefinger.
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Nov 25, 2014 05:55
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Buttonhead posted:Looks like she was killed by Goldfinger's younger, poorer brother, Concretefinger. BAHBAHBWOOOW Concretefinger, he's the man The man with the gorgon touch
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Nov 25, 2014 07:02
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 Blind people playing soccer. Somehow.
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Nov 25, 2014 13:47
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Stex T posted:
There's a bell in the ball, and there are guides at the side of the pitch. Amazingly the goalkeepers are sighted and people still score.
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Nov 25, 2014 14:36
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Stex T posted:
Why do they need blindfolds?
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Nov 25, 2014 15:40
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mds2 posted:Why do they need blindfolds? Partially sighted players play too, so everyone wears a blindfold so they can't see a thing. Partially sighted players may be able to get an advantage from seeing the light of the sun and being able to orientate themselves more quickly than fully blind players, for example.
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Nov 25, 2014 15:45
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