Launch Loop to Space: Questions & Answers

[I3VI5]

Hello guys, this is my first post here so sorry if I put it in the wrong section.

I heard the idea of a launch loop to space and thought it was really cool so I wonder why they haven't build it yet.

Now since I'm no physics expert I need some clarifications on the physics in building it.

Before starting let's make the assumption that we can "easily" achieve the necessary speed to send it to LEO.

OK? So here are the questions:

1. If we build a launch loop on sea level, what is the speed it must achieve to get to LEO?

2. If it is propelled in a vacuum tube, then after reaching the needed speed (my guess is 10km/s), can it withstand the impact with air at sea level? If no, at what altitude will it be able to withstand it with the current technology?

3.What is the sonic boom at those speeds?

5. Where is the best place on Earth to build it? (I have 10bn$ ready to invest! :-D )

6. If you were to design one, and money was not an issue (I can provide more than 10 billion if you want! lol), what would it be like?

7. Why haven't they build it yet? I'm tired of going to Bora Bora for vacation, I need something new! lol

Before dismissing the idea or calling me names reflect a bit on it, it won't hurt anyone.

Thanks in advance for all your responses!

 

[AJ Bentley]

Why do you assume, before anyone answers, that they are going to be dismissive?

It's a perfectly valid idea, but hopelessly speculative.

Now, have you got anything you want to say that's actually worth talking about?

 

[Archosaur]

Why do you assume, before anyone answers, that they are going to be dismissive?... Now, have you got anything you want to say that's actually worth talking about?

Uh, Do you realize how inconsistent this reply is?

Also, the tech is speculative, but some of his questions (launch velocity, etc.) are perfectly good. If I weren't at work right now I'd do the math. I will when I get home, if no one else has by then.

 

[AJ Bentley]

Of course I do - that was the point of the joke.

As I said, it's hopelessly speculative - that's why I won't be bothering to think about it.

 

[pallidin]

2. If it is propelled in a vacuum tube, then after reaching the needed speed (my guess is 10km/s), can it withstand the impact with air at sea level?

Yeah, I don't think that would be a good idea.

 

[delt0r]

I assume you mean this type of launch loop http://en.wikipedia.org/wiki/Launch_loop.

In which case all your questions are more or less answered with the "original article" here (also in the refs in the wiki article): http://launchloop.com/LaunchLoop?action=AttachFile&do=get&target=launchloop.pdf

Other links on the wiki page are also good.

Personally I think the design would work better with pellets rather than a ribbon.