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Crew Dragon Docks with ISS

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Re: Crew Dragon Docks with ISS

#41

We are a small step closer inhabiting Mars. When we will, it will be the most important event in the five billion years history of our solar system. In other words, we are witnessing some pretty cool stuff.

Elon Musk will have cities on planets names after him for generations to come. The legacy he leaves will be greater than that of Ghengis Kahn, Ceasar, or Alexander the Great.

Until someone else comes along :)

Re: Crew Dragon Docks with ISS

#42
post #39

So when seeing this I had two questions, one of which I've found the answer to, one of which still remains a mystery. 1. Why only two astronauts? and 2. How much is Crew Dragon costing? For (1), it's stated [1] that Crew Dragon has a capacity of seven astronauts but only 4 for NASA? How does that work? Does that mean the NASA configuration only has 4 seats? I found this [2] saying seats 1 and 4 were empty. Why not 4…

Minimum number of astronauts in case of disaster

Re: Crew Dragon Docks with ISS

#43

We are a small step closer inhabiting Mars. When we will, it will be the most important event in the five billion years history of our solar system. In other words, we are witnessing some pretty cool stuff.

I admire the confidence and romance, I don’t know how you do it.

Re: Crew Dragon Docks with ISS

#44
post #15

SpaceX runs basically as a giant R&D program that also happens to accomplish useful things as byproducts of its approach (with the miracle of insurance to cover costs if things get explody). Every flight is data for incremental improvement. If you think of all SpaceX has ever done was try to get to this point, with somewhere around 80 flights on the Falcon 9, but for a variety of mission buyers (NASA, USAF, Commercia…

> We now have the capability to put up another ISS today, resupply it, and staff it, at a fraction of the cost, all with launch equipment made by a single company that started a decade ago.

This is the part that's exciting for me. Whether it comes in the form of more space stations like the ISS or a much bigger and reinvigorated ISS, either way is a vital step in the right direction toward making humanity less beholden to a single planet.

Lots of challenges still to come, but this is a reminder that those challenges can someday be overcome.

Re: Crew Dragon Docks with ISS

#45
post #34
post #27

Earlier quoted context omitted.

Lower cost to orbit, sure. Increased economic activity in orbit? Where does that part come from? It's not like we haven't sent people to the ISS before. And it's not like SpaceX hasn't managed to reuse hardware before. It's basically just a mix of those two things. Really the most significant things about this were that astronauts were launched to space from the US and it was a private company. And out of those, the…

Well we're not gonna get to Mars with that attitude!

Mars is key ! We must get to Mars!!!

Re: Crew Dragon Docks with ISS

#46
post #34
post #27

Earlier quoted context omitted.

Lower cost to orbit, sure. Increased economic activity in orbit? Where does that part come from? It's not like we haven't sent people to the ISS before. And it's not like SpaceX hasn't managed to reuse hardware before. It's basically just a mix of those two things. Really the most significant things about this were that astronauts were launched to space from the US and it was a private company. And out of those, the…

Well we're not gonna get to Mars with that attitude!

Seems like that’s exactly the attitude you need.

Re: Crew Dragon Docks with ISS

#47
What's with the gradient shadow? The space station shadow crossed the module, and it was blurry. I thought shadows in space were knife-sharp. The nose-cone shadow was.

Its not the stream resolution, is it? Other knife-sharp features were visible.

Maybe the space station is fuzzy? Maybe the module material blurs shadows? What am I missing?

Re: Crew Dragon Docks with ISS

#48
post #39

So when seeing this I had two questions, one of which I've found the answer to, one of which still remains a mystery. 1. Why only two astronauts? and 2. How much is Crew Dragon costing? For (1), it's stated [1] that Crew Dragon has a capacity of seven astronauts but only 4 for NASA? How does that work? Does that mean the NASA configuration only has 4 seats? I found this [2] saying seats 1 and 4 were empty. Why not 4…

>Why not 4 astronauts?

You've been in the teamwork game a long time, right? You know that each new team member added to a team does something like double or quadruple communication overhead. They're trying to work out the kinks - they're going to with a small team of experienced people to stay focused.

There's probably also a limit to how many people they want to keep track of on ISS, like you said. It's also less risky like you said - you need two people in case one gets incapacitated, and also for psychological support, but you don't want to risk any more people on the maiden voyage than you have to.

>Compared to Soyuz [4], which cost NASA $80m/astronaut, that's a saving but not as much as I would've thought.

There's more to it than costs. We now have the agency to launch as many astronauts as we want, when we want, rather than filling in a vacant seat the Russians have. Something not considered in just costs is we can also charge other nations for rides on our rockets, and as long as it's less than $80m, we'll make profits and it'll be a win for those nations who'd normally ride on Soyuz.

Re: Crew Dragon Docks with ISS

#49
post #26

Earlier quoted context omitted.

All true, however, (splitting hairs, yes), the reason FH9 can best the shuttle boosters is because they had to carry the shuttle itself, which was around 50 tons.

I wonder, as a percentage of launch vehicle, how much mass the shuttle program managed to reuse after a mission vs. the F9Heavy? It turns out not having to "shuttle" half a dozen humans up to orbit every time you want to get something up there is a good idea.

Was the full crew necessarily just to put things in orbit? My impression was that most of the crew was doing other sorts of science and such because they might as well do so while the Shuttle's out in space (and later to get as many people into the ISS as possible per trip, which the Crew Falcon should now be able to do - maybe not to the same degree as the Shuttle, but certainly to a better degree than Soyuz).

Re: Crew Dragon Docks with ISS

#50
post #11

How much AI/ML do you think is running on the software associated with this launch and docking? I suspect there’s a great deal of very explicit, well tested code, but very little AI/ML.

Very little in terms of what you would consider AI or ML. It's a lot of trig and control theory. You do a lot of the math beforehand to figure out the script the craft will follow to reach the ISS. Once it gets close, you either use manual controls or let autopilot do the docking. The autopilot is basically looking some dots on a camera and firing the thrusters to make the dots line up right. It's more like a dumb PID controller than an AI. The autopilot isn't learning anything or somehow making connections that weren't already programmed. This is all stuff NASA figured out how to do in the 60s so it's nothing novel except for the mission and the hardware the math is done on.
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