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vxbush
4/30/2024 6:08:23 AM
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3
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NASA lays out how SpaceX will refuel Starships in low-Earth orbit The article first talks about transferring fuel between Starships, but then it switches and talks about the goals for the next Starship launch: [The next launch] will include a precise landing of Starship's Super Heavy booster in the Gulf of Mexico, which is necessary before SpaceX tries to land the booster back at its launch pad in Texas. Another objective will likely be the restart of a single Raptor engine on Starship in flight, which SpaceX didn't accomplish on the March flight due to unexpected roll rates on the vehicle as it coasted through space. Achieving an in-orbit engine restart—necessary to guide Starship toward a controlled reentry—is a prerequisite for future launches into a stable higher orbit, where the ship could loiter for hours, days, or weeks to deploy satellites and attempt refueling. ... During [future test flights], will measure the slosh of propellants inside the ship, along with tank pressures, and observe how the fluids respond to impulses from small thrusters. In microgravity, these small rocket jets provide "settling thrust" to guide the ship's liquid toward the outflow needed for refueling. Engineers will also monitor the boil-off rates of the methane and liquid oxygen in space. Over time, cryogenic liquids transition to a gaseous state without insulation or other measures to prevent boil-off. SpaceX and NASA officials want to know how much of the propellant will be lost from boil-off to know how many refueling tankers they need to launch for a Starship lunar landing mission. I'm assuming any information that might have been gathered related to boil-off during space missions in the 1960s to 80s wouldn't be useful because the mixture of propellants has probably changed, and I'm guessing significantly. There's a nice chart on the page documenting goals for the transfer demo and future work planned. I think my favorite phrase in the article is "laser navigation." Heh.
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vxbush
4/30/2024 6:14:20 AM
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5
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I saw a car yesterday that had a "Strong empowered female supporter of Elizabeth Biden" bumper sticker on it, and I couldn't help but wonder--so you're so strong and empowered that you feel you can't live unless you tell everyone about it? Do you not realize that means you're working harder to bolster your own opinion than changing anyone else's?
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JCM
4/30/2024 7:21:28 AM
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7
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Reply to vxbush in 6: Whoa is us for the lack of positive rights for government! /s
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JCM
4/30/2024 7:25:51 AM
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9
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Reply to vxbush in 2: Blood borne pathogen safety protocols? Who need 'em in pursuit of those rosy cheeks! Instead of "health" class they learned to put condoms on bananas.
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vxbush
4/30/2024 7:33:31 AM
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10
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In #8 Occasional Reader said: Boy, that 2 pm "deadline" at Columbia U yesterday sure did the trick, didn't it? I take it they still haven't been arrested as of this morning?
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vxbush
4/30/2024 7:34:01 AM
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11
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In #9 JCM said: Blood borne pathogen safety protocols? Who need 'em in pursuit of those rosy cheeks! This is not the stupidest thing I've seen in women's pursuit to stay beautiful, but it comes close.
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Occasional Reader
4/30/2024 8:19:31 AM
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12
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"...Both Moody’s and S&P have Boeing just a notch away from a speculative-grade (or “junk”) credit rating"
Back in the mid 90s, when I was a wet behind the ears associate at NYC BigLaw, the biggest deal (in terms of dollar value) I ever worked on was a ten-figure revolving credit line from our Big Bank client, for Boeing. It was also - paradoxically - the easiest deal I worked on. Why? Because our Big Bank clients basically told us: "Boeing's in-house legal will be sending you the draft credit agreement, based on their own model document. Unless they've misspelled our bank's name or something like that... greenlight it. Don't make any comments that aren't absolutely necessary. We WANT this client." That's how strong a credit Boeing was, thirty years ago. What has happened to that company is akin to treason.
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Occasional Reader
4/30/2024 8:23:04 AM
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13
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In #10 vxbush said: I take it they still haven't been arrested as of this morning?
Hahaha "arrested". Of course not! On the other hand, BBC World Service gave a nice tongue-bath this morning to a lefty Columbia anthropology professor (last name of "al-Haj", I believe) who was all about supporting these little orcs. Did you know that the only instances of "harassment" of students at Columbia these past weeks have been eeevil right-wingers harassing the pro-social-justice urchins; including "women having their hijabs ripped off"? it's true! Well, narratively-true, anyway.
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vxbush
4/30/2024 8:31:23 AM
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14
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In #13 Occasional Reader said: On the other hand, BBC World Service gave a nice tongue-bath this morning to a lefty Columbia anthropology professor (last name of "al-Haj", I believe) who was all about supporting these little orcs. Did you know that the only instances of "harassment" of students at Columbia these past weeks have been eeevil right-wingers harassing the pro-social-justice urchins; including "women having their hijabs ripped off"? it's true! Well, narratively-true, anyway. And at the local campus, pictures were shown of chalk art where students were asking the university to divest from "genocide". No explanation given of how the place was doing that, of course. Just raw emotion.
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vxbush
4/30/2024 8:32:01 AM
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15
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In #12 Occasional Reader said: That's how strong a credit Boeing was, thirty years ago.
What has happened to that company is akin to treason. Who do we blame besides the folks who came in via the merger?
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JCM
4/30/2024 8:49:21 AM
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16
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Reply to Occasional Reader in 12: Wnat happened was the McDonnell merger. McDonnell had been run into the ground and Boeing bought McDonnell. But somehow McDonnell managers took control. McDonnell where bean counters and Boeing Engineers.
What we see is the result.
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Occasional Reader
4/30/2024 9:20:18 AM
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17
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Reply to JCM in 16:
So we've more or less lost GE, Westinghouse, MD, and now Boeing looks headed to the crapper.
Fortunately, we can base our entire economy on Social Media Influencers, no problem.
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Occasional Reader
4/30/2024 10:16:13 AM
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18
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Quote of the day, at least so far: “How can you take a Hamas protest seriously when they let women speak?”
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Kosh's Shadow
4/30/2024 4:17:44 PM
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In #12 Occasional Reader said: That's how strong a credit Boeing was, thirty years ago.
What has happened to that company is akin to treason. That's what happens when the management concentrates on money, not product. "We need to ship those planes to make our numbers! So what if the crash"
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Kosh's Shadow
4/30/2024 4:18:38 PM
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In #3 vxbush said: I'm assuming any information that might have been gathered related to boil-off during space missions in the 1960s to 80s wouldn't be useful because the mixture of propellants has probably changed, and I'm guessing significantly. More likely the boil off parameters vary with the tank design and materials, as well as how much light (heat) the spacecraft absorbs and transfers to the tanks.
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Kosh's Shadow
4/30/2024 4:32:35 PM
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21
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This just in - Columbia University has changed their Holocaust Studies program to concentrate on how to bring on another Holocaust.
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