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Station Crew Docks Dragon Capsule to ISS

nasa.gov

21–30 of 82 posts

Re: Station Crew Docks Dragon Capsule to ISS

#21
post #3

Whenever I see ISS dockings I wonder why the arm isn't computer controlled. There's no specific information on this page but I'm assuming it was a manual docking. Can anyone explain why the process is still manual?

Best described as a scaling problem with manual or prototype, vs automated.

Lets say you need a prototype ability tool and die maker machinist on staff to handle "things" during development. And you need a simple piece of threaded rod. You could blow a lot of extra time and money on getting a CNC programmer and the software and a numerically controlled lathe or machining center dropped in to make that boring simple little piece of threaded rod. Or you could say, "dude, I know this is beneath your skill, but you're just sitting there burning oxygen and it'll only take ten minutes for you to machine a piece of threaded rod, so ..."

If you have a tool that's designed to do anything, and the tool and op are just sitting there, even if you could automate a one-off, the overall system cost and productivity is higher if the op just does it by hand.

If you have a VERY active schedule, and maybe 3 simultaneously operating 24x7 arms all over the station with only one dude available to run all the arms and everything at 150% of designed thruput capacity etc, then it would make economic sense to automate this task so the arm op can work on something more human oriented, but ...

Re: Station Crew Docks Dragon Capsule to ISS

#22
post #16

Is it common to use metric system when launching rockets to space or is it a peculiarity of SpaceX? I heard the speaker on SpaceX channel always referring to kilometers and kilometers per second when talking about height and speed.

The metric system contains the SI units. It is extremely commonly used in the scientific setting, due to its capacity for precision and clarity.

Re: Station Crew Docks Dragon Capsule to ISS

#24
post #16

Is it common to use metric system when launching rockets to space or is it a peculiarity of SpaceX? I heard the speaker on SpaceX channel always referring to kilometers and kilometers per second when talking about height and speed.

Consider too that a lot of aerospace stuff is done in collaboration with other countries. No one wants to be converting vyorsts to hogsheads all the time.

Re: Station Crew Docks Dragon Capsule to ISS

#25

Earlier quoted context omitted.

MATES UNDER THE POWER OF THE CANADARM

Out of context, this sounds like a line from a very bad book. Have an upvote.

To both parent and GP:

Please don't comment on HN like you would on Reddit. If you don't have questions or information to add to the thread, you should probably use that as a cue to refrain from posting.

Joke posts might not seem bad, but in aggregate they lower the signal to noise ratio we have come to appreciate about HN. Additionally, once these kinds of jocular posts start, it becomes infectious.

I'm not trying to be mean; I'm guilty of making posts like this too. Many of us simply do not want to see HN devolve into the equivalent of a spammy subreddit. It's important that we all remind each other of the value of this community so that we can protect it from spiraling into a bad state.

Re: Station Crew Docks Dragon Capsule to ISS

#26
post #16

Is it common to use metric system when launching rockets to space or is it a peculiarity of SpaceX? I heard the speaker on SpaceX channel always referring to kilometers and kilometers per second when talking about height and speed.

Is there any sort of engineering anywhere that is not done in SI units nowadays?

Re: Station Crew Docks Dragon Capsule to ISS

#27

Earlier quoted context omitted.

Out of context, this sounds like a line from a very bad book. Have an upvote.

To both parent and GP: Please don't comment on HN like you would on Reddit. If you don't have questions or information to add to the thread, you should probably use that as a cue to refrain from posting. Joke posts might not seem bad, but in aggregate they lower the signal to noise ratio we have come to appreciate about HN. Additionally, once these kinds of jocular posts start, it becomes infectious. I'm not trying t…

Please don't tell others how to post. It's patronizing. There's a voting system you can use to express your concern.

Re: Station Crew Docks Dragon Capsule to ISS

#28
post #16

Is it common to use metric system when launching rockets to space or is it a peculiarity of SpaceX? I heard the speaker on SpaceX channel always referring to kilometers and kilometers per second when talking about height and speed.

It's common for pretty much all of engineering really. It's ludicrous to make calculations a bit more complicated by using weird non-SI units. The fact that NASA managed to crash a probe into Mars because they hadn't yet learned the lesson says it all really. Just use SI units and stop worrying about it.

If anyone is curious, it looks like it was the fault of Lockheed. NASA's contract specified SI units: http://en.wikipedia.org/wiki/Mars_Climate_Orbiter

Re: Station Crew Docks Dragon Capsule to ISS

#29
post #16

Is it common to use metric system when launching rockets to space or is it a peculiarity of SpaceX? I heard the speaker on SpaceX channel always referring to kilometers and kilometers per second when talking about height and speed.

Is there any sort of engineering anywhere that is not done in SI units nowadays?

US government contracts.

Re: Station Crew Docks Dragon Capsule to ISS

#30
post #7

Does anyone know what happens to the pod after a shuttle-craft docks and delivers cargo? Do they push it back to earth? Into space, leave it in orbit?

The ISS crew load it up with cargo to be returned to Earth. It makes a controlled re-entry, splashes down in the Pacific and is recovered.
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