Kryten
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Posts posted by Kryten
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While I wait for the HQ versions of these images, have a quick-and-dirty add of BFR to the New Glenn comparison image;
and the version with HLV's
will edit this post with the polished version later.
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When you see a blackout moving, that's not really anything to do with the speed of electricity, that's just the power grid shutting down section by section. The actual speed of electricity depends on a bunch of factors like the material it's travelling through, but in real-world conditions it'll pretty much always be a double-digit percentage of the speed of light.
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A big part of the long lifespan is that it isn't doing very much any longer. Big, power-hungry instruments like the cameras were shut down a long time ago.
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The IAC started yesterday. There's a lot more there than just Elon's talk.
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On 9/26/2016 at 2:53 AM, Diche Bach said:
Well what about telecommunications satellites? Do they still cost as much as they ever did? Idea being: there is demand, thus competition, thus lower prices? No?
They cost far, far more than they used to, because they steadily got bigger and more sophisticated to meet increased demand. The first commercial communications sat weighted 68kg, now we have some that are above 6 metric tons. Supply and demand doesn't really apply to sats directly, because the sats aren't in demand; the services they provide are.
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1 hour ago, Sereneti said:
no, a Space shuttle is a three-stage vehicle:
First stage - SRB; Second stage: Drop tank; third stage - the shutle itself.The definitions are a little fuzzy, but if what you drop doesn't contain an engine not many people will call it a stage. I don't of anyone who lists Briz-M and it's auxiliary tank as two stages, for example.
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Just now, Red Iron Crown said:
It's my understanding that Soyuz uses an upper core stage, there hasn't been an orbital R-7 with a single stage core since the '60s.
That's what I get for posting right after waking up. I meant to put 'launched sputnik'.
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In standard western reckoning, a vehicle with boosters and a core stage is a stage-and-a-half vehicle, meaning something like the R-7 that launches Soyuz isn't considered a proper SSTO. Ariane 5 and STS are incidentally two and a half stage vehicles; ariane 5 always has an upper stage, and shuttle needed it's OMS engines to actually reach orbit. In Russian reckoning, boosters are a complete stage and something like R-7 is a two stage vehicle.
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1 hour ago, kerbiloid said:
If not ISRU, why methane? Kerosene is not volatile, needs no cryogenics, its tanks are lighter, ISP isn't much less.
Engine performance. Can't do FFSC with kerolox.
1 hour ago, kerbiloid said:IfISRU, how they would lift tens if not hundreds tons of liquid methane from Mars to the ship orbit. Hard to imagine a lander with multi-use 4 meter nozzles.
From the hints we have, we know the architecture has the transfer ship landing. There's only the booster rocket, a ship to fuel the transfer ship in earth orbit, and the transfer ship/lander.
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Fins look to be smaller than in the original reveal.
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Most Ariane 5 flights use a hydrolox upper stage, the hypergolic one is now only intended to be used for Galileo launches.
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Fuel from coal-≥liquid process has been used in rockets, specially the German Wasserfall anti-air missile.
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Either that or it's a subscale test model.
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Quote
Elon Musk @elonmusk
Production Raptor goal is specific impulse of 382 seconds and thrust of 3 MN (~310 metric tons) at 300 bar
Even with FFSC and that chamber pressure, you're not going to get that thrust out of an engine smaller than Merlin. It looks like it's a combustion chamber with no real nozzle yet, that would throw off apparent size quite a bit.
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It was a helium system rupture, but we don't have enough info to say it was definitely a COPV; failure in the plumbing close to one could have much the same effect.
In other news;
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3 hours ago, Diche Bach said:
Until I learned that they found glycine spraying out of an ablating comet a few years back, I would have agreed with you. But the fact that thing is apparently "coated in a layer of glycine" seems like a total game changer to me.
You can't make a living organism out of amino acids, so that's not really relevant. Best guess we've got is that the earliest life used RNA, and still would've needed something else to make a membrane.
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Dark Matter is pretty hard to explain away as handwaving, because it's not just extra mass at certain scales, as far as we can tell it really does act like independent matter. We've got galaxies with different apparent distributions of dark matter, ones that seem to be made almost entirely of dark matter, and instances of colliding galaxy clusters like the bullet cluster where dark matter content has been almost unaffected by the collision, leaving mass distribution skewed.
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Latest update is that all fires are confirmed 100% contained, and they're planning to be fully operational on Monday.
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Can you explain how either device is supposed to work in terms of momentum transfer?
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Hubble was launched 26 years ago, but not much of it is actually that old due to the servicing missions.
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They're pretty sure the second was a downed power line, and given the location it looks pretty likely for the third too.
The original fire is 100% contained, and south base is starting to become operational again. The latest update didn't mention the latter two fires, but presumably they are also considered 100% contained. Should just be mopping-up to do now, as long as more lines don't come down.
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Think about the momentum here. Where is the extra momentum supposed to come from?
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You'd have to make major mods to the pads to support an LH2 stage like Centaur. I don't think ULA can sell stages to third parties anyway, the joint venture agreement that created ULA is pretty restrictive.
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I've got good news and bad news; the good news is the second fire seems to be contained, after reaching about 200 acres in extent. The first fire also seems to still be contained.
The bad news is there's a third fire, on the base property north of Lompoc prison. I can't find a good map showing south base v. north base, but I think the area involved is the on the southern edge of north base. The fire is about 30 acres and moving south.
IAC Today!
in Science & Spaceflight
Posted
There's nobody to enslave, steal gold from, or work to death in silver mines on Mars.