ptfrd

joined 1 year ago
[–] ptfrd 4 points 6 months ago* (last edited 6 months ago) (1 children)

the most likely alternative would be to bring the astronauts back using SpaceX's Crew Dragon by removing two astronauts from the Crew-9 mission

The most likely? Not convinced. Wouldn't anyone removed from Crew-9 just be shifted to Crew-10? So it'd seem silly to announce Crew-10 only to have to change it a week later.

And even if they don't care about looking silly in that way, they might instead just go with one empty seat 'uphill' for each of Crew 9 and 10. Because that's a less drastic change to make to Crew 9 at such short notice.

But maybe I'm wrong. So, assuming the quoted scenario actually is what happens ...

I guess they'd have to keep the Russian (Gorbunov)?

And keep the capsule commander (Cardman)? But she's never been to space, so maybe the pilot (Hague)? I can't immediately see if he was expected to be the ISS commander, but if so, I guess that would give them a good excuse to 'promote' him over Cardman?

Wilson has had more launches than Hague (3 versus 2ish) but a lot less time in space, and I don't know if she would be as well trained for Dragon as the commander & pilot.

[–] ptfrd 3 points 6 months ago

They say they really like Starliner, and I think they mean it. After all, it's not that bad! If you offered me a free trip to space in it, I'd jump at the chance.

In fact I'd offer to pay at least 1/3 of my net worth. (Sadly this doesn't quite equate to the current cost-per-astronaut of, what, $150m?)

[–] ptfrd 5 points 7 months ago (1 children)

Turns out that some of the later parts of the video I posted largely negated my above comment.

What do you think will happen to the other one? Do you think they’ll maintain a Florida splashdown capability indefinitely, as a backup

Question at 43:08.

43:56 "There may be a small transition period as we're moving vessels through the Panama Canal ... where we can support either Coast ..." (implying not indefinite)

e.g. in case of bad weather in all the new West Coast splashdown zones

51:15 "one benefit of moving to the West Coast is much better weather"

Also of interest ...

30:39. Sounds like they didn't bother with a Public Safety Determination in the end, and just went directly to full(?) approval.

[–] ptfrd 3 points 7 months ago

And I see that the Soyuz TMA-11 crew included Peggy Whitson. We wouldn't want the same kind of thing to happen to her twice!

(Her 2nd Axiom mission is NET November this year, so that shouldn't be affected by this change, but any subsequent Axiom missions might be.)

[–] ptfrd 4 points 7 months ago* (last edited 7 months ago) (2 children)

Only yesterday I was here objecting to large expenditures on debris mitigation (specifically, to the "US De-Orbit Vehicle" for the ISS), so I guess I'd better be consistent (regardless of down-votes)!

If I was advising SpaceX, I'd tell them to go with this West Coast plan.

If I was advising humanity as a whole, I'd point out that despite our evolved psychology as a species, we are sometimes still capable of behaving rationally. And if the expected value of any particular iniative to make some space industry debris less likely to do harm to people/property is less than the actual cost of that initiative, it probably shouldn't go ahead.

Also, I'd be interested to see how this changes the Loss of Crew probability. Presumably it's less risky to do trunk separation prior to the deorbit burn, because if the separation process encounters any problems, there is much more of an opportunity for troubleshooting.

[–] ptfrd 5 points 7 months ago (2 children)

We’ll move a Dragon recovery vessel to the Pacific some time next year

What do you think will happen to the other one? Do you think they'll maintain a Florida splashdown capability indefinitely, as a backup (e.g. in case of bad weather in all the new West Coast splashdown zones)?

Or just keep it going for a while, until they're happy with the new arrangements? Would they then decommission the other recovery vessel? (There are just two of them, right?) Or move it to the West Coast to join its sister?

[–] ptfrd 1 points 7 months ago* (last edited 7 months ago)

We've all heard of BEAM (Bigelow Expandable Activity Module). Now here comes the BOOOOM (Boeing Overstaying Overpriced Orbital Operations Module) ...

[–] ptfrd 2 points 7 months ago

I interpret the figurative use of the word "stomped" the same as I do for "wrecked" or "destroyed" or "annihilated". Basically, 'to beat easily/substantially'.

Do you have any examples of cases where it has been used to imply underhand behaviours? (Obviously if a SpaceX employee literally stomped on a competitor's prototype, that would be an example! But I assume that's not what you mean.)

[–] ptfrd 2 points 7 months ago

Uncontrolled re-entry of a single large object would, I think, be preferable to re-entry of dozens of them.

I guess the opposite. It won't be a single object for long, after the final re-entry has started, so I say give the breakup process a headstart! (Well, I don't actually. I actually assume it's a bad idea, and would like to know why. Geopolitics not included.)

No agreement would have any effect on the headlines saying “US allows its spacestation to crash on city, killing 800 people”.

Agreed. However, I'd bet my life that this wouldn't happen. Both literally (though I'd need good odds, and a high valuation for the value of my life!), and in the sense that I (and all my loved ones) live under the ISS's flight path.

I estimate (partly based on this) that less than 0.6% of the earth's surface is "built-up". (Though the ISS doesn't fly over it all equally, so call it 1%.)

For what it's worth (nothing?!), I used that figure, and some other guessed figures, to guess that the expected value of the number of people killed per uncontrolled ISS reentry is 0.05, so on average needing 20 space stations to kill 1 person.

[–] ptfrd 7 points 7 months ago (2 children)

Cost Plus contracting (including hybrids thereof) should probably be banned (in anything other than a war economy).

If companies can't compete and that's undesirable, subsidize them - but be up front about it.

One option would be to have them bid as normal, but then have central government pay X% of the money so that it doesn't come out of the budget of the specific department (e.g. NASA), if the struggling company wins the contract. And so the department would be incentivized (and required) to treat the struggling company's bid as if it was actually X% lower.

Keep increasing X until you're satisfied with the level of dissimilar redundancy.

[–] ptfrd 2 points 7 months ago

But later on the SpaceX person is asked about launch and just says something about the "Falcon product line", IIRC.

[–] ptfrd 0 points 7 months ago

There’s a lot of evidence that he’s an ass-hat

That's a separate question from the one I thought we were discussing.

But equally unverifiable evidence that makes him look like a kind of crazy genius is A-OK?

It's all unverifiable to us. But at that point you have to remember the elephant in the room: his companies' multiple successes, pushing forwards the state of the art, in multiple domains, in a commercially viable way.

I'll remind you that my previous comment used wording such as "I suspect", and "you can imagine". I'll now, off the top of my head, put a number on it. I'm 85% confident that the primary explanation for his otherwise unlikely run of successes, is that he's a genius of an engineering manager.

What's your primary explanation, and confidence level?

Which makes sense, given that the folks that adore him are also into conspiracy theory nonsense.

I consider myself anti- conspiracy theory. When I encounter them in various comment sections, I quite often briefly reply, politely correcting people. My guess would be that such people are more likely than average to dislike Musk.

As for me, I don't adore him. And I have multiple criticisms, and things I'd want to learn more about before judging him too positively overall.

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