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RE: Finding the Problems for the Existing Solutions - Hyperloop
Funny enough (with the first picture) in order to do the trip in ~30 minutes would require constant acceleration (for part of it the acceleration will have to be negative) and it is just absolutely ridiculous.
Speaking about the acceleration: TGV accelerates very gently, I quote:
Keeping such pace, Hyperloop would need about 15 minutes.
From the car perspective (similar value for the passenger airplane during the takeoff phase), 0-100 km/h in 10 s is reasonably fast, thus the Hyperloop would need to give a strong push at the back for 1.5 minutes and 1.5 minutes to come back to zero.
The fastest de-acceleration one could experience in the car, when you want to kiss the windshield is achieved with about V=sqrt(2as) 1g, or 10 m/s2
Imagine such force applied for 30 s. It's not convenient transportation, it's the amusement park ride :D
Doesn't seem to be fun for an amusement park ride either.
The concept behind this is solid... the practicality? Not very practical. I've looked into it a bit and it seems that the US government is going to be fine with letting Elon and peers throw millions of dollars into this project because of Elon's record (SpaceX, Tesla, Paypal, etc.).
I haven't touched up on the science behind it yet, but will this weekend and make claims for hyperloop.
For me, the distances are the most problematic. If we take a look at the map of Europe we can easily see that even the capital cities are relatively close to each other (Paris-Brussels 300 km) and already well covered with the train networks, highways or the airports - thus there is no clear benefit of building the Hyperloop.
Another question would be how to integrate the Hyperloop with the other systems.
Top 4 airports in Europe: London, Paris, Amsterdam, and Frankfurt.
All the major airline companies have some connections there, they are "collecting the passengers" from all over the World.
One or several Hyperloop lines could not make the change in the system.
And the costs, again.
TGV line per kilometer costs between 5 and 20 Million.
Let's assume that Hyperloop cost only double the amount (impossible, but ok).
1000 km track = 40 billions.
It's more than the double budget for NASA (18.4)
GDP of France or Germany is about 2000 - 3000 billion
Imagine the proposal to spend 1% of the total GDP of Germany and France to connect Paris and Berlin.
In other words, to spend the whole military budget of Germany or France to build a train.
Even if possible, probably nobody would be strong enough to build them
The distance is definitely an issue, but I don't see it being as much of an issue in the US as it would be in Europe as the "major" cities have a bit more distance to them than that.
I'm gathering stuff for a post and going to talk to some of my physics professors tomorrow to work out the science side of it. From what I've read, it should check out if he implements it correctly.