Hyperloop Gets Test Track in California
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Hyperloop Gets Test Track in California
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Re: Hyperloop Gets Test Track in California
#2A 5-mile test track won't be big enough to examine the biggest concerns: thermal and seismic. The alpha brochure linked to in the OP barely touches on the two. Here [1] is a better analysis/take-down of what thermal issues such a long structure will encounter. (TL;DR: A 400-mile long continuous structure will need to accommodate 1000 feet of thermal movement over it's length and lifetime.) Seismic is another beast: it requires a much more thorough examination than the cursory glance it was given in the alpha paper.
[1] http://www.leancrew.com/all-this/2013/08/hyperloop/
Thermal effects on Maglev research: https://www.lib.utexas.edu/etd/d/2007/kimh10315/kimh10315.pd...
EDIT: Apologies for the negativity... I hope this reads as more of thoughtful criticism, rather than as being hypercritical.
Re: Hyperloop Gets Test Track in California
#3A 5-mile test track won't be big enough to examine the biggest concerns: thermal and seismic. The alpha brochure linked to in the OP barely touches on the two. Here [1] is a better analysis/take-down of what thermal issues such a long structure will encounter. (TL;DR: A 400-mile long continuous structure will need to accommodate 1000 feet of thermal movement over it's length and lifetime.) Seismic is another beast: i…
Thermal expansion is not really an issue that gets worse with distance, as the track can simply be made from independent segments connected with expansion joints. The issue is being able to cross from segment A to segment B not the number of such segments. In other words if it works on a test track it scales just fine, but getting that first connector to work is the hard part.
Earthquakes require active dampening which defiantly increases costs, but a larger issue is how to cross fault lines as you need a very large turning radius so very long segments of track need to be able to move. AKA you can't do this: http://pubs.usgs.gov/fs/2003/fs014-03/pipeline.html Unless you’re willing to really slow down.
PS: Also of note, you are going to need safety exits on a fairly regular basis and some way to quickly add air to the pipe as people are not going to be able to walk hundreds of miles in case of an issue.
Re: Hyperloop Gets Test Track in California
#4A 5-mile test track won't be big enough to examine the biggest concerns: thermal and seismic. The alpha brochure linked to in the OP barely touches on the two. Here [1] is a better analysis/take-down of what thermal issues such a long structure will encounter. (TL;DR: A 400-mile long continuous structure will need to accommodate 1000 feet of thermal movement over it's length and lifetime.) Seismic is another beast: i…
I'd imagine that there's a great deal of prior work, research, and implementation detail on Maglev trains in Japan on this very issue. Not to say that you're not right, but that this test track is probably precisely what's needed for an initial test, since the other issues (commonly solved with expansion joints) are being actively tackled/solved by many different industries.
Re: Hyperloop Gets Test Track in California
#5A 5-mile test track won't be big enough to examine the biggest concerns: thermal and seismic. The alpha brochure linked to in the OP barely touches on the two. Here [1] is a better analysis/take-down of what thermal issues such a long structure will encounter. (TL;DR: A 400-mile long continuous structure will need to accommodate 1000 feet of thermal movement over it's length and lifetime.) Seismic is another beast: i…
I'd imagine that there's a great deal of prior work, research, and implementation detail on Maglev trains in Japan on this very issue. Not to say that you're not right, but that this test track is probably precisely what's needed for an initial test, since the other issues (commonly solved with expansion joints) are being actively tackled/solved by many different industries.
According to Wikipedia [1], the only 3 passenger service operational Maglev lines have lengths of 18.95 miles, 5.5 miles, and 3.8 miles, which are in China, Japan and South Korea respectively. That would make it seem like it is far from a "solved" issue.
[1] https://en.wikipedia.org/wiki/Maglev#Operational_systems
Re: Hyperloop Gets Test Track in California
#6"If the position of the wall deviates from straightness by a few thousandths of an inch, you could crash ... if you lose the vacuum in the tube, everybody in the tube will crash ... the vehicle's compressor ... can't fail, or the pods will crash ... The 5-mile test track is estimated to cost about $100 million, which Hyperloop Transportation Technologies hopes to pay for with its initial public offering (IPO) later this year."
This article will one day be featured in a museum exhibit on laughably divorced-from-reality bubblethink.
Re: Hyperloop Gets Test Track in California
#7"If the position of the wall deviates from straightness by a few thousandths of an inch, you could crash ... if you lose the vacuum in the tube, everybody in the tube will crash ... the vehicle's compressor ... can't fail, or the pods will crash ... The 5-mile test track is estimated to cost about $100 million, which Hyperloop Transportation Technologies hopes to pay for with its initial public offering (IPO) later t…
[deleted]
Re: Hyperloop Gets Test Track in California
#8> The problem with traveling in an evacuated tube is, if you lose the vacuum in the tube, everybody in the tube will crash
Wouldn't that be a "crash" into a gradually rising air preassure? Something like a smooth deacceleration.
Re: Hyperloop Gets Test Track in California
#9Sigh
"The 5-mile test track is estimated to cost about $100 million, which Hyperloop Transportation Technologies hopes to pay for with its initial public offering (IPO) later this year, according to Navigant's blog."
Run away, run far far away. They might as well do a kickstarter. Seriously, what sort of "business" is a 5 mile test track?
Lets say you charged $25 for a "5 minute ride on the hyperloop!" and you got 8 people in it, and you had perfect efficiency, and you ran non-stop for 10 hrs a day, 7 days a week then $100M is 414 days. And that isn't including the cost of running the ride in the first place. I guess I'll find out why they think I should think about investing in their S-1 but for right now, I am totally not seeing it.
Re: Hyperloop Gets Test Track in California
#10"If the position of the wall deviates from straightness by a few thousandths of an inch, you could crash ... if you lose the vacuum in the tube, everybody in the tube will crash ... the vehicle's compressor ... can't fail, or the pods will crash ... The 5-mile test track is estimated to cost about $100 million, which Hyperloop Transportation Technologies hopes to pay for with its initial public offering (IPO) later t…
Perhaps as an example of journalistic failures? Reading the actual paper this is just not true.