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> if you are going to build these atmospheric pipes why not put the carriages inside them Because when the vacuum breaks then people die if they are inside. Th

by chx 9y ago

> if you are going to build these atmospheric pipes why not put the carriages inside them Because when the vacuum breaks then people die if they are inside. This happens to be one of the biggest weaknesses of Hyperloop. It's not a good system when a failure _anywhere_ in the pipes causes a massive loss of life. If this guy's propulsion fails then, well, the train stops gradually, not a biggie. If air enters into a vacuum tube where the Hyperloop carriage is, the shockwave will do something to the carriage people ride in and it won't be pretty.

averagewall 9y ago
Really? How? Couldn't the train stop if the pressure starts to go up too high? It sounds a bit like saying, a broken rail _anywhere_ in a train network causes a derailment and massive loss of life. Train drivers can't see broken tracks until it's too late to stop.
- dredmorbius 9y ago
  1. Pressure. 2. Speed. 1600 km/s is pretty snappy. Thunderf00t tends to wibble on a bit and repeat repeat himself, but he does make his point. Relevant bits start about 6m22s. https://m.youtube.com/watch?v=Z48pSwiDLIM https://m.youtube.com/watch?v=Z48pSwiDLIM Or at 10m28s in this video: https://m.youtube.com/watch?v=RNFesa01llk https://m.youtube.com/watch?v=RNFesa01llk
  - SolarNet 9y ago
    I'm sorry isn't this the guy that has a creepy obsession with Anita Sarkessian and that associates with ~Nazis~ anti-semitic misogynistic racists.
    - dredmorbius 9y ago
      He definitely has commented on Sarkeesian, and critiques some elements of feminism, a few of whom richly deserve it. That's not an area I'm particularly interested in, and I've not followed his videos there. His critiques of poorly-conceived technological concepts, in particular the "Solar Freakin' Roadways" scam, and Hyperloop, strike me as largely on-mark (if repetitious and self-rightous). I'm not familiar with any Nazi or other associations, though that would be most unfortunate. RationalWiki addresses some of this: http://rationalwiki.org/wiki/Thunderf00t http://rationalwiki.org/wiki/Thunderf00t It has no bearing on the technical criticisms addressed above, however.
      - SolarNet 9y ago
        His comments on Anita Sarkeesian are creepy and obsessive. Let alone the fact he blatantly and deceptively edits her videos to make his point. https://www.youtube.com/watch?v=7bVqfQvXP2o https://www.youtube.com/watch?v=7bVqfQvXP2o . If he's dishonest (not that he's wrong, but that he's dishonest) about basic social studies why should I trust his science? Let alone his experimental results? To be fair he recently disassociated himself from the alt-right ("not") nazis. So there is that at least.
  - rdtsc 9y ago
    > 2. Speed. 1600 km/s is pretty snappy Way too snappy. Surely you meant /h not /s
    - dredmorbius 9y ago
      Wups, yes. My error.
schiffern 9y ago
>If air enters into a vacuum tube where the Hyperloop carriage is, the shockwave will do something to the carriage people ride in This is Thunderf00t's "shock wave" argument, and it has survived frequent debunkings. Are we really so easily misled that slapping sciencey branding behind any poorly thought out claim will cause people to repeat it as truth? The huge thing he forgot is... pipes are not lossless! A tube break would initially cause the air to rush in at the speed of sound, but after a few kilometers the backpressure from friction with the tube walls will slow the air to highway speed and spread out the pressure rise. The way it works out, if you're close enough to the breach to be killed by the pressure wave, you're close enough that you can't stop in time before derailing.
- chx 9y ago
  > The way it works out, if you're close enough to the breach to be killed by the pressure wave, you're close enough that you can't stop in time before derailing. Huh? Who's derailing here? The problem is, again, that if just a seal breaks close enough to a carriage, you are dead. This is not comparable to a derailing which requires quite a bit of things go wrong on a normal train or the propulsion dying in this elderly chap's magnetic train.
  - SolarNet 9y ago
    I think he meant in comparison to a train track breaking up with a high-speed train on it. Read the sentence more carefully as a comparison against existing train technology.

by chx 9y ago

averagewall 9y ago

Really? How? Couldn't the train stop if the pressure starts to go up too high? It sounds a bit like saying, a broken rail _anywhere_ in a train network causes a derailment and massive loss of life. Train drivers can't see broken tracks until it's too late to stop.

dredmorbius 9y ago
1. Pressure. 2. Speed. 1600 km/s is pretty snappy. Thunderf00t tends to wibble on a bit and repeat repeat himself, but he does make his point. Relevant bits start about 6m22s. https://m.youtube.com/watch?v=Z48pSwiDLIM https://m.youtube.com/watch?v=Z48pSwiDLIM Or at 10m28s in this video: https://m.youtube.com/watch?v=RNFesa01llk https://m.youtube.com/watch?v=RNFesa01llk
- SolarNet 9y ago
  I'm sorry isn't this the guy that has a creepy obsession with Anita Sarkessian and that associates with ~Nazis~ anti-semitic misogynistic racists.
  - dredmorbius 9y ago
    He definitely has commented on Sarkeesian, and critiques some elements of feminism, a few of whom richly deserve it. That's not an area I'm particularly interested in, and I've not followed his videos there. His critiques of poorly-conceived technological concepts, in particular the "Solar Freakin' Roadways" scam, and Hyperloop, strike me as largely on-mark (if repetitious and self-rightous). I'm not familiar with any Nazi or other associations, though that would be most unfortunate. RationalWiki addresses some of this: http://rationalwiki.org/wiki/Thunderf00t http://rationalwiki.org/wiki/Thunderf00t It has no bearing on the technical criticisms addressed above, however.
    - SolarNet 9y ago
      His comments on Anita Sarkeesian are creepy and obsessive. Let alone the fact he blatantly and deceptively edits her videos to make his point. https://www.youtube.com/watch?v=7bVqfQvXP2o https://www.youtube.com/watch?v=7bVqfQvXP2o . If he's dishonest (not that he's wrong, but that he's dishonest) about basic social studies why should I trust his science? Let alone his experimental results? To be fair he recently disassociated himself from the alt-right ("not") nazis. So there is that at least.
- rdtsc 9y ago
  > 2. Speed. 1600 km/s is pretty snappy Way too snappy. Surely you meant /h not /s
  - dredmorbius 9y ago
    Wups, yes. My error.

schiffern 9y ago

>If air enters into a vacuum tube where the Hyperloop carriage is, the shockwave will do something to the carriage people ride in This is Thunderf00t's "shock wave" argument, and it has survived frequent debunkings. Are we really so easily misled that slapping sciencey branding behind any poorly thought out claim will cause people to repeat it as truth? The huge thing he forgot is... pipes are not lossless! A tube break would initially cause the air to rush in at the speed of sound, but after a few kilometers the backpressure from friction with the tube walls will slow the air to highway speed and spread out the pressure rise. The way it works out, if you're close enough to the breach to be killed by the pressure wave, you're close enough that you can't stop in time before derailing.

chx 9y ago
> The way it works out, if you're close enough to the breach to be killed by the pressure wave, you're close enough that you can't stop in time before derailing. Huh? Who's derailing here? The problem is, again, that if just a seal breaks close enough to a carriage, you are dead. This is not comparable to a derailing which requires quite a bit of things go wrong on a normal train or the propulsion dying in this elderly chap's magnetic train.
- SolarNet 9y ago
  I think he meant in comparison to a train track breaking up with a high-speed train on it. Read the sentence more carefully as a comparison against existing train technology.