Hacker News new | ask | show | jobs
by Retric 3688 days ago
Vacuums get much more costly as you get ever lower pressure. Hyperloop is an interesting cost / benefit between fast travel and lower construction and maintenance costs which is why the speeds are relatively low. The vehicle is also closer to an electric aircraft than an electric train. Note the big fan on the front: https://en.wikipedia.org/wiki/Hyperloop#/media/File:Hyperloo...

Another consideration is the faster you travel the straighter your path needs to be. 4,000+MPH paths require incredibly strait designs.
1 comments
kuschku 3688 days ago
You realize that the fan concept, and the hovercraft concept both were cancelled?

The new hyperloop concept is just a fan-less capsule hovering on a MagLev track.

It’s just VacTrain over again, but more expensive and with lower capacities.

link
Retric 3688 days ago
I don't think that qualifies as 'HyperLoop' even if they keep the name. It's like building an airplane except you use it underwater, sorry that's a sub.

That said, it suggests that the HyperLoop concept is not viable which is not that surprising IMO. However, it might also just be a case of lower R&D costs.

link
kuschku 3688 days ago
Well, obviously they want to keep the hype alive. So it’s understandable that they’d refuse to change the name.

Sadly, this also means we have a lot of people think this is something revolutionary, although I guess that’s intentional.

It’s really annoying when you consider how the US refused a proposal from japanese companies a few years ago to build a MagLev system between Boston, NY, Washington, with capacities around 10k people per hour.

link
nickparker 3688 days ago
"Cancelled" by who?

Hyperloop One is by far the most credible project, with HTT somewhere behind them in second. They haven't revealed anything about their compression systems or lack thereof. HTT has backed off air levitation, but they're still using Inductrack which is radically cheaper than conventional MagLev and hasn't been applied commercially yet.

Several of the competition teams (like the one in this article) have built MagLev sleds with nice brakes, but they're just trying to win a speed record competition. That has no bearing on the real Hyperloop. Other teams are focusing more on scalable tech and doing some pretty innovative work.

The lower per-vehicle capacities also aren't a negative if launch cadences can be kept high enough to maintain throughput. Smaller vehicles let the network operate in a more point-to-point manner instead of the stop-and-go crap that trains have done since day one.

link