CatastrophicFailure
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Posts posted by CatastrophicFailure
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12 minutes ago, mikegarrison said:
So that means that even though there are 9 engines, there is no redundancy for landing?
Here:
21 hours ago, sevenperforce said:All nine engines are lit on the pad using TEA-TEB plumbed from the ground. Only three specific engines are plumbed to the onboard reservoir of TEA-TEB needed for in-flight restart. When the first Falcon Heavy launch failed to land the core, it was because the onboard TEA-TEB reservoir ran dry just after restarting the core engine for the second time, meaning there was not enough remaining for the other two engines to relight. They fixed this in subsequent Falcon Heavy flights by making the core's reservoir bigger.
So this is the problem. If Falcon 9 had lost one of the other
foursix engines on ascent, it would have been okay, but since it lost one of the intended landing engines, it was stuck. It can't choose other engines to relight because they aren't plumbed with TEA-TEB. I'm guessing they went ahead and tried to force a restart of the engine that previously shut down and its burn-through got worse.Starship, of course, won't have this problem because all of the Raptor engines use their own internal spark igniter and can relight at any time, independent of any other engine or system.
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3 hours ago, YNM said:
I've read from a long time ago that there are reversible ones and I've always wondered how exactly one would reverse it, and what it would look like...
See, now I live in a very mild, not too hot not too cold climate, and I got a heat pump specifically because it was more economical for warmth than the old electric “furnace.” The fact that I also got air conditioning out of the deal was a (very appreciated) bonus.
For even more efficiency (and up front cost), you can use the ground as your heat source (even tho it’s always the same temperature a few meters down
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Or got the opposite direction, and start pumping some really massive amounts of heat, and you can liquify air.
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CLOCK.
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That is one honking big missile.
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1 hour ago, tater said:
https://www.fly.faa.gov/adv/adv_spt.jsp
Mentions SN10 launch... who knows.
Not holding my breath tho...
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3 hours ago, RyanRising said:
Static fire happened, looks like about 2-2.5 seconds. I don't think that's full duration, is it?
Friday's closure has been cancelled, so that's either really good... or really bad...
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I wonder how much, if any of this, is related to Bezos’ pending retirement from Amazon to spend more time on Blue? Perhaps he plans a little less graditam, a little more ferociter? The longer the delay to their debut after Starship and Vulcan become operational, the tougher their business case seems.
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So this is interesting, apparently in Boca there’s a SpaceElevator...
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31 minutes ago, Jacke said:
brought up Starlink not in and of itself, but as an example of Elon Musk using SpaceX to establish a new project that didn't take into account all of its consequences, especially the negative ones. And it's good that there has been some changes to reduce Starlink's light pollution, but why wasn't that thought of before the first launch?
I think that’s a bit unfair. Elon doesn’t run SpaceX in a vacuum (har har), not even Shotwell does. Before they ever started bending metal for StarLink, he had to convince a lot of other people (including actual Rocket Scientists™️) that it was worthwhile. From my understanding, they did take impacts on astronomy into account, what with low orbit choice and what not, but perhaps didn’t realize the magnitude of the effect, which has since been largely corrected (good luck seeing a StarLink anywhere now, except maybe under ideal conditions). As they say, hindsight is 2020, and with engineering as with anything, sometimes you have to actually make a thing to fully realize the problems.
38 minutes ago, Jacke said:These are serious problems. That Starlink may provide a workaround for somewhat. But it won't solve all of them. The root causes need to be addressed. And a disaster-robust infrastructure doesn't have to have Starlink.
I would argue that it does have to include StarLink, or something very like it. The system’s value was already demonstrated during last summer’s wildfires. A massive earthquake could cause region-wide disruption of land-based communication, leaving satellites the only option. Information is becoming as crucial as food and clean water during such disasters.
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1 hour ago, tater said:
If you could snap your fingers, and have the spaceflight capability of a show like the Expanse be a thing, would that be something you'd want to see?
Nitrogen. Freaking. Glaciers.
And someone pelted with a Plutonian snowball.
1 hour ago, tater said:yes, then Starlink, etc, are pretty unconcerning, as the night sky would literally be filled with the reflections of large spacecraft +- X hours from sunset/sunrise, and all night long from more distant craft,
This. Whether Starlink happens or not, the night sky will look very different in a hundred years, or a thousand. What happens once we start building orbiting megastructures visible to the naked eye? Progress demands change. Visual astronomy may not seem so crucial some future day when one can buy a cheap ticket and go setup a telescope on the dark side of the moon...
...or Pluto...
1 hour ago, tater said:We know what initial Starlink costs. $499 for the dish, and $99/mo. The dish is also wifi, so you could have multiple people use the same wifi. People with the beta already get ~5X my DSL speed ($50/mo), so I could share with my neighbors and get what we all currently get for $20/mo.
Can’t find it, of course, but there’s a tweet upthread mentioning Starlink will shortly be upping to like 300mbps.
34 minutes ago, magnemoe said:However have fun getting fiber on an remote farm
in the first world.
*raises hand*
And it’s not even that remote. I don’t even have reliable cell service, I’m dependent on the internet or the (lousy) local phone company for communication. And that’s shown no signs of changing in the 14 years I’ve been here, there’s just no market to support that kind of infrastructure upgrade, and if anyone tried the local NIMBYs would go apoplectic. There’s “supposed” to be gig fiber in my area “soon,” but still waiting, and same lousy local phone company to deal with. And will probably drop out in a power outage, and CERTAINLY in an earthquake. Satellites don’t do that.
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9 hours ago, Flying dutchman said:
*Grabs popcorn
See, now, I halfway wanna cringe my way through crap like this yelling at the screen, but I don’t want to give such creators the benefit of the view clicks.
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The wife and I spent the weekend setting fence posts:
Spoiler
...and the hole time she was singing this:
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1 minute ago, cubinator said:
I was fully expecting to see seabird roast in a few seconds there.
Looked like the landing burn started, you could see it in the clouds. I wonder if the engine aborted or if it exploded in flight.
Did anyone catch the “stage 1 FTS has safed” call?
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1 minute ago, cubinator said:
Oh my god, STAGE 1 SACRIFICED ITSELF FOR THE BIRDS
I hope it ended with “fly, you fools!” too.
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Um... booster telemetry just dropped out...
Seagulls are unperturbed too...
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Yesterday was the flock's first real snow day.
And they were having NONE of it.
The chickens just sat huddled in the one little corner of the run that wasn't snow-covered or hid in their heated (!) roost. The ducks, as usual, gave no... cares.
Opened the door to the paddock and the ducks waddled right out, grumbling under their breaths the whole time, as is their way. The chickens just... pouted. So, like any responsible flock-keeper, I did the only decent thing I could do at that point.
I rounded them up and threw them out.
Gotta build character, y'know?
And here's where it got interesting... and funny. 2020's birds, the Peeper Trio and the Tiny Velociraptors, they adjusted pretty quick once they realized there was food to be eaten, but the OG chickens from the year before, they just kind of... stood there. Like they were, well, frozen.
Just look at this majestic, tailless, Flock-of-Seagulls-haired ball of anger and aggression:
He never lets me get that close. At least not without a fight. I couldn't even herd them back into the run, they stumbled one step at a time or jump-flew, as if they couldn't figure out they could walk in the snow. I had to grab them one at a time and move them back inside. Where they went back to huddling and pouting. Except the ducks, who just went to sleep on the snow.
Also, this:
tho I can't take credit.
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2 hours ago, StrandedonEarth said:
And that first single 2032 battery I put in has lasted longer than any other pair of 2016s I've put in it, except maybe for the original pair it came with.
Hmm. Makes a certain amount of sense, especially with batteries that thin, twice the size means MORE than twice the amount of electrolyte, since there’s no terminal metal/structure between two cells. LEDs can usually handle lower voltage, up to a point, without dimming too.
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2 hours ago, Spaceman.Spiff said:
I haven't noticed any, so i think that's true.
As a mod, do you prefer being a Moderator, a Module, or a Modification?
Perhaps they prefer the very MODel of the MODern major MODerator?
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We’ve! Got! HARDWARE!!11!,!!
...and the crowd goes mild...
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Never know when a sticky-fingered space shuttle might start creeping on you, Ivan...
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14 hours ago, tater said:
Yeah, $99/mo is kinda steep since I can get moderately fast DSL.
Anywhere rural here that's a good deal, though.
Now, where I am that’s actually extremely competitive, I pay Comcast around $180 for cable and broadband. Local phone company has options from $60-$90 but, well, they suck too. Did your buddy get the same “mid to late 2021” estimate?
3 hours ago, RuBisCO said:Well I'm hoping it will be 24/7 reliable up here at 45°N by "mid to late 2021" as it says, it will be a real bummer if it is is not by the time I get it.
Same for you, eh?
Maybe that timeframe is just general and they’ll actually be shipping to early orderers sooner?
As I understand, and I could be wrong, StarLink should not really be affected by weather much, as the frequency it operates at can get through clouds/moisture, and the phased array antenna can compensate a great deal for any wind jostling of the dish.
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Starlink is now available to the general public!
...sort of.
Its very limited, first come, first served, and according to the info won’t even be in my area til mid-late 2021.
Thats... really disappointing. I would’ve expected to be higher up the list just based on latitude. Same cost as mentioned long ago, $99/mo, $499 for hardware + $50 shipping, taking a $99 deposit now if you’re area’s not served yet.
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3 hours ago, sevenperforce said:
The idea would be to have a single RCC “filler tile” shape that would fill the regularly-shaped gap created by iterations of this pattern. If the pattern repeats, the filler tile shape will repeat as well. So just three tile shapes: hex, filler, and nosecone.
But I like the trapezoid idea better.
3 hours ago, tater said:Could they shield the nosecone with simply different sizes of tiles? There’s pictures on NSF of SN11, below the big tiled area are smaller patches of test tiles and one such patch does indeed have some smaller hex tiles one the edge. There’s some obvious gaps but not bad.
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49 minutes ago, Geonovast said:
Like, a 4 speed manual? Does seem a bit odd.
That Corolla's got a 6 speed manual, which was really hard to find. Well, manuals are hard to find to begin with, but I didn't even know they made 6 speed until I saw that one.
Slush box. A stick would at least be entertaining to drive.
Everything else in this bracket I’ve driven has either had a CVT or a truly silly number of gears. Which I suppose is what a CVT is, too.
31 minutes ago, TheSaint said:Millennial anti-theft device.
Give it a few years and pretty soon a steering wheel will be, too.
).
in the first world.
Everything else in this bracket I’ve driven has either had a CVT or a truly silly number of gears. Which I suppose is what a CVT is, too. 
SpaceX Discussion Thread
in Science & Spaceflight
Posted
Added complexity (of more plumbing) means added weight, added cost, and potentially added failure modes. There’s something to be said from simply figuring out, through trial and error, how long X part can go before it need thorough inspection or just preemptive replacement. As this was a life leader part, that sound largely like what they’re doing. They don’t want to invest too much effort here, as Starship is right around the pike, and is planned to make Falcon obsolete. The question is, where does that balance point come?