General > General Technical Chat

The Hyperloop: BUSTED

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stj:
you do.

David Hess:

--- Quote from: retrolefty on July 30, 2016, 11:51:19 pm ---And all that doesn't even take in the political issues. Do you really think they could build such a system that only served the two end cities without requiring lots of stops at other cities along the route? This idea is a true turkey and a real fiscal boondoggle.

--- End quote ---

That is a feature which makes it politically possible.  Politicians and their friends can buy up the land where future train stops will be added at the other cities along the route just like with the DC to Dulles freeway.

hayatepilot:

--- Quote from: edavid on August 04, 2016, 07:44:09 pm ---I don't think we have the technology to dig a 400 mile tunnel :(

--- End quote ---

Yes, it shouldn't be too difficult, because it wouldn't be that far underground. So after every couple of km one could make a opening to the surface to get the dirt out and bring machinery and people in.
Just many tunnels in series.  ;)

Greetings

Brutte:

--- Quote from: David Hess on August 05, 2016, 12:59:41 am ---Politicians and their friends can buy up the land where future train stops will be added at the other cities along the route just like with the DC to Dulles freeway.
--- End quote ---
Greed. The best part of US.

Mark_Of_Sanity:
UPDATE

So a team of hyperloop engineers had a reddit session and I thought I'd share the link here.

https://www.reddit.com/r/IAmA/comments/4wck43/hi_were_mostly_engineers_here_at_hyperloop_one/

Also, one of them briefly addressed Thunderfoot, which I will quote here.

"I've got this one. I have watched the video, and made copious notes. Thunderf00t is a well known youtube science commentator, best known for debunking religious fundamentalists and understanding the surface-maximization of liquid alkali metals, published in Nature last year.

That aside, both hyperloop videos show a complete reluctance to engage with the real arguments. Sorry, but highlighting some semi-literate comments by your critics does not amount to engaging in a useful discussion. I would like to levitate this video into the sun.

Here are some specific points and rebuttals: -Thunderf00t primarily makes reference to the Hyperloop alpha whitepaper, written by some SpaceX employees in 2013. I saw no evidence of engagement with subsequent press releases by any of the hyperloop companies. In particular, TF doesn't seem to be aware that there is more than one hyperloop company. FYI, we are Hyperloop One, the company that has raised ~$108 and built the world's most powerful linear motor in 5 months. -Thunderf00t talks a good game about aerodynamics, but shows no evidence of even having read the wikipedia article on choked flow, duct flow, the Kantrowitz limit, or knowing any of the other 'first day on the job' level detail for our aero team. -One of Thunderf00t's technical gotchas was 'expansion joints are difficult', despite the fact that hydraulic cylinders exist, most steel rails are thermally pretensioned, and thermal expansion is probably something we thought of already. -Thunderf00t could have easily looked up our people on LinkedIn, checked their google scholar bona fides, whatever, but seemed more keen on a cheap take down than actually engaging with interesting and ongoing engineering challenges. -One symptom of the level of technical effort that went into TF's video is his careless assumption that 1g = 1m/s/s, as though Hyperloop was being built on some tiny moon of Jupiter. As a fellow academic, I was disappointed by TF's lack of intellectual humility in an area in which he is obviously not an expert. One would wonder why TF would put such hastily produced, easily debunked rubbish on his Patreon feed - people actually pay for that!

-Casey"


Thoughts?

p.s.

"$108" in the quote is meant to be $(10 to the power of 8 ).

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