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SpaceX launch webcast: Orbcomm-2 Mission [video]

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Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#231

Are they planning on using this recovered first stage for a reusability test, or are they going to destructively examine it to see how all the components held up?

It might be possible to deconstruct it to examine it, then put it back together and reuse what's reusable.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#232
post #124

Earlier quoted context omitted.

I think you underestimate the degree of difficulty between these two achievements. They are both very impressive but what SpaceX just did is many times more difficult than what Blue Origin did.

OK, explain how the landing of the SpaceX first stage was many times more difficult? They used different mechanisms, yes (suicide burn vs. hover-capable) and the purpose of the overall system was different, but they are both VTOL rockets. Blue Origin was first , and Bezos can quite rightly welcome SpaceX to 'the club' as the second company to achieve this, without being accused of being classless, surely?

Because Falcon9 is a big launcher taking a serious payload into orbit. This means that the first stage has to have very large engines - so large that they can't be throttled down to hover, they have to kill velocity at the point of touchdown.

It's the difference between slowing your car down gently to stop at a red light, and having your car going at max speed and slamming on the brakes as hard as you can at exactly the right moment so that you will eventually stop at the lights. One is easy to do, the other will most likely get you killed.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#233

Are they planning on using this recovered first stage for a reusability test, or are they going to destructively examine it to see how all the components held up?

According to someone who was on a press call, Musk says he's going to keep this one on the ground[1]. They'll disassemble and examine it, but it'll probably go in a museum afterwards.

1. https://twitter.com/NASAWatch/status/679129749105459200

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#234

Are they planning on using this recovered first stage for a reusability test, or are they going to destructively examine it to see how all the components held up?

They have stated that the plan is to take it apart and learn. All previous large rockets boosters that have been recovered, have been recovered after either crashing, or crashing and then being immersed in sea water. Both of these do a lot of damage.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#235
Elon should thank the American people. This achievement was financed by us and wouldn't be possible without the forward looking NASA program.

So before we all thank Elon for taking our money, let's pat our selves on the back.

Really we should thank the amazing spacex engineers, who worked tirelessly. Not just Elon. Sure he worked hard too, but not much more than anyone else at spacex

I'm just tired of the Elon worship. Nobody acknowledges the amazing people who actually made this happen. As an engineer it pisses me off. Sorry if this is an unpopular opinion.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#236
This is so epically awesome that I feel like we orbited a human for the first time or something. Bezos whining aside, its a huge deal to return 9 engines from a workhorse booster back to the pad to be refurbed and re-used. If the $5M each costs are correct, that is $45M in cost savings right there.

But perhaps more importantly its the first "first" for SpaceX which has not been done by NASA or anyone else. Launch a payload in to orbit and recover the booster back to the launch site. The SRBs from the shuttle were essentially shell refurbs, SpaceShip 1 and Blue Origin sub-orbital hops. This was, in my estimation, the real deal. It has to be an amazing feeling being on the team that made this possible. Congratulations, that is one way to write yourself into the history books.

Edit: I was so excited I couldn't even multiply 9 by 5!

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#237

Earlier quoted context omitted.

This video ain't bad, but it skims over the two most important points and skips one completely: - SpaceX rocket goes really fast horizontally; it has to flip around and boost back, and then correct from horizontal to vertical orientation. - Falcon 9 is an actual space launch system; it has different (i.e. much stricter) engineering constraints than a suborbital rocket. In particular, this affects the engine design. -…

Why don't they put a smaller engine in the centre for landings?

It would make the rocket too heavy. To add another engine, they would have to make the rocket larger in diameter, increasing the weight by a fair amount (they currently have the 9th engine in the middle, so it would have to get moved to the ring with the rest). Reducing the power of the center engine would also reduce the amount of payload to orbit.

Rockets that can reach orbit have very bad weight to payload ratios (Falcon 9 is ~2.5% takeoff weight to LEO) so there isn't much room for dead weight.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#238
post #235

Elon should thank the American people. This achievement was financed by us and wouldn't be possible without the forward looking NASA program. So before we all thank Elon for taking our money, let's pat our selves on the back. Really we should thank the amazing spacex engineers, who worked tirelessly. Not just Elon. Sure he worked hard too, but not much more than anyone else at spacex I'm just tired of the Elon worshi…

Elon Musk has already been quoted as saying that the United States is "the greatest country that has ever existed on Earth".

https://en.m.wikipedia.org/wiki/Elon_Musk#Nationalism

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#239

Are they planning on using this recovered first stage for a reusability test, or are they going to destructively examine it to see how all the components held up?

First they get to recover all the video that they didn't get in the other stages :-) This one lands with its cameras and flash chips intact. If I were them I would tear it apart, learn from it, reassemble it, and then display it.

Interest question about safeing it once it is landed. You can't just dump excess liquid oxygen are you'll end up starting fires. Fortunately it isn't like the shuttle which had Hydrazine in the OMS tanks that had to be managed post landing.

I can't wait until they land one in the daylight, and on the west coast so I can watch in person.

Re: SpaceX launch webcast: Orbcomm-2 Mission [video]

#240
post #238
post #235

Elon should thank the American people. This achievement was financed by us and wouldn't be possible without the forward looking NASA program. So before we all thank Elon for taking our money, let's pat our selves on the back. Really we should thank the amazing spacex engineers, who worked tirelessly. Not just Elon. Sure he worked hard too, but not much more than anyone else at spacex I'm just tired of the Elon worshi…

Elon Musk has already been quoted as saying that the United States is "the greatest country that has ever existed on Earth". https://en.m.wikipedia.org/wiki/Elon_Musk#Nationalism

I am not complaining about Elon Musk. I'm complaining about the people worship I am reading all over the internet whenever he makes the news. I am complaining about you and me.
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