Live data from Hacker News

SpaceX lands rocket at sea second time after satellite launch

phys.org

331–340 of 497 posts

Re: SpaceX lands rocket at sea second time after satellite launch

#331
post #205

Earlier quoted context omitted.

NASA reused every engine (not just the first stage) of an orbital payload delivery system, many times, 30 years ago. Runway rather than barge but that's not really an important difference. (The exciting part will be much cheaper refurbishment than the STS. But SpaceX haven't actually delivered on that component yet)

> Runway rather than barge but that's not really an important difference. it is an important difference when you look beyond earth the moon, mars, and any future site that has yet to send robots to pave a runaway that is: 4,500 meters long, 91 meters wide, and 40 centimeters thick(o); will necessarily be vertical take off and landing (o) https://en.wikipedia.org/wiki/Shuttle_Landing_Facility

Also kinda hard to glide in for a landing when there's little/no atmosphere...

Re: SpaceX lands rocket at sea second time after satellite launch

#332
post #259

Earlier quoted context omitted.

One. They're planning on testing manned missions with their Dragon 2 and Falcon Heavy in mid-2017.

Wow are they really ready for human life onboard in a year? Unmanned failure doesn't bring much press. Kill a few people and it will set back the whole program years.

Since they don't have to deal with the insulation issues like the shuttle did, the most dangerous phase of flight for a crew is during launch. Last Spring, SpaceX demo'ed their launch abort system which in theory should be able to protect the astronauts against any launch problems;

https://www.youtube.com/watch?v=1_FXVjf46T8

Re: SpaceX lands rocket at sea second time after satellite launch

#333
post #325

Earlier quoted context omitted.

Completely incorrect. The question to ask is, why are they bothering to land at sea? And, if you had done any cursory research instead of just announcing that SpaceX is making a PR grab because it sounded good to you, you would have read in the abundantly available explanations that this launch was to geostationary transfer orbit, rather than low earth orbit. GEO is a lot, lot higher than LEO, which means the rocket…

> So it's not plausible to get all the way back to the launch site. I never said return to the launch site. I said return to land. > if you had done any cursory research instead of just announcing that Unnecessary to speak that way in order to make your point unless you are trying to specifically make someone feel bad for voicing their thoughts.

I'm not trying to make you feel bad, I'm trying to point out that you deliberately chose pejorative phrasing without having done any research. I'm trying to point out that it's not constructive to talk about someone else's work like that without at least learning what they're even doing or why they're doing it.

Re: SpaceX lands rocket at sea second time after satellite launch

#334
post #303

Earlier quoted context omitted.

> Sorry. We are living in a period where mediocrity and even complete fraudulent stuff is hailed as profound and "amazing". Like what? Even the transistor is pretty damn amazing. It's fine to be critical, but let yourself get excited sometimes too.

Check out the history of the person you're replying to. That person doesn't get stoked about anything. It's a shame, really.

Getting stoked about trivial stuff and mistaking stunts for real achievements is one of the ways we will end up in Idiocracy. I see here, a whole generation of people reduced to a bunch of stupid cheerleaders...

The shame is on you. Not because you play along in this charade. But for how you see and project me for not taking part in it.

Re: SpaceX lands rocket at sea second time after satellite launch

#335

Earlier quoted context omitted.

You're getting downvoted into oblivion, but yeah, that's basically how I feel. Cultural differences, I'm sure, because I'm not USian; but every time I see it on the youtube videos it makes me deeply uncomfortable.

I'm an American, and I'm just wondering why it makes you uncomfortable? Does chanting at sporting events make you uncomfortable as well? edit: Reply button showed up finally

Its a collective/cult response, is why it makes me uncomfortable. "Everyone else is doing it, so should I", and while its occurring, no other rational thought is occurring. It is a known thought-stopping technique in cults.

I also despise it when it happens at sports events. Its just demeaning to whoever doesn't fall in line and start the goose-step.

Re: SpaceX lands rocket at sea second time after satellite launch

#336
post #324
post #158

Earlier quoted context omitted.

The response crew comes and secures the legs on the barge immediately after landing. They bolt them down somehow, I think.

There's a response crew? Like, people? Are they on a boat nearby? I may have misinterpreted "drone ship". :/

Yes, the Go Quest is nearby with a support crew to deal with the stage after it lands.

Re: SpaceX lands rocket at sea second time after satellite launch

#337

Earlier quoted context omitted.

> Sorry. We are living in a period where mediocrity and even complete fraudulent stuff is hailed as profound and "amazing". Like what? Even the transistor is pretty damn amazing. It's fine to be critical, but let yourself get excited sometimes too.

>Like what? Look around. If you don't see it already, I won't be able to make you see. And what does the transistor has to do with the period we live in? I mean, right now, not 50 years earlier. >It's fine to be critical, but let yourself get excited sometimes too. Do you know why landing a rocket in salt water is bad. I mean, do you really, really know? From Spacex subreddit.. https://www.reddit.com/r/spacex/comment…

Isn't that why they are landing on a barge though?

Re: SpaceX lands rocket at sea second time after satellite launch

#338
post #59

Earlier quoted context omitted.

To add to above: In the previous barge landing they did weld the landing legs to the barge using some kind of bracket. But they discovered that the centre of gravity is low enough to not need any welding. During the previous attempt the sea was heavier than this time. Maybe they still weld it this time, but that is done by having someone go to the barge and do it.

Actually no they did not weld anything to the legs. Elon said that they realize it wasn't needed. They did use octojack though to support the weight off the legs.

What's octojack? Can't seem to find any other references to that.

Re: SpaceX lands rocket at sea second time after satellite launch

#339

I remain confused about why SpaceX is getting so much fanfare and praise. What have they accomplished that NASA didn't already accomplish during the Apollo missions? I know SpaceX is doing it all more cost effectively, because we have better technology, but have they actually accomplished anything tangible that NASA didn't a generation ago?

As an Engineer I might be a little biased but I see this is a massive achievement. We are seeing a paradigm shift in space exploration with the rise of the influence of the private sector. Space exploration used to be the domain of government entities. That is gone now. I believe we are seeing a new age of exploration not seen since the 15th and 16th centuries of discovering the "new" world. These new space companies…

As an idiot, is is less expensive than asking the NASA or the ESA, or any other providers?

And well, can the "materials" really be recycled without loss of security/quality?

Is the metal more expensive than the carburant/comburant?

Re: SpaceX lands rocket at sea second time after satellite launch

#340

Earlier quoted context omitted.

I'm an American, and I'm just wondering why it makes you uncomfortable? Does chanting at sporting events make you uncomfortable as well? edit: Reply button showed up finally

Its a collective/cult response, is why it makes me uncomfortable. "Everyone else is doing it, so should I", and while its occurring, no other rational thought is occurring. It is a known thought-stopping technique in cults. I also despise it when it happens at sports events. Its just demeaning to whoever doesn't fall in line and start the goose-step.

First "and while its occurring, no other rational thought is occurring". I'm not really sure how to respond to that. Of course no rational thought is taking place. It's a celebration. They aren't trying to have a rational discussion.

Second "Its just demeaning to whoever doesn't fall in line and start the goose-step". I have never seen anyone that is somewhere people are chanting it and be ridiculed for not joining along. It is completely up to anyone whether they want to participate.

I think space exploration/achievement is a very big point of pride for Americans. Ever since the moon landing, everyone has fell in love with the space program. Chanting USA! doesn't mean give up all rational thought and blindly follow the countries leaders. It means a bunch of Americans just did something amazing. I'm glad to be a part of this country that is doing great things. It also doesn't mean go USA fuck Europe. Sure there is a little bit of a competitive undertone, but so what. If SpaceX says look what we did, I dare you guys to do better well then good. Competition is the reason why space programs are where they are. Sorry you don't like how one country likes to celebrate. Luckily everyone is free to do whatever they want.

Post reply on HN