Hyperloop

Author
Discussion

xRIEx

8,180 posts

147 months

Wednesday 12th October 2016
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pherlopolus said:
It is just a YouTube video, not a textbook.
Yes, that's correct. What's your point?

pherlopolus

2,087 posts

157 months

Wednesday 12th October 2016
quotequote all
xRIEx said:
Yes, that's correct. What's your point?
This comment sums it up..

"Wright Brothers: We have an idea for heavier-than-air flying machine.
Thunderf00t: Clearly you are snake-oil merchants. Ball-park numbers, your engine is going to be highly inefficient as to be impractical over any great distance. Not to mention that this 'aerofoil' is fine for birds, but structurally deficient on the scale that you are going to need it.
Wright Brothers: We'll try it anyway.?"

You are using the youtube video as your only proof that you think it wont work...

Edit: https://www.youtube.com/watch?v=BJa9tQyMXDc Hyperloop Busted : Busted....


Edited by pherlopolus on Wednesday 12th October 10:14

xRIEx

8,180 posts

147 months

Wednesday 12th October 2016
quotequote all
pherlopolus said:
xRIEx said:
Yes, that's correct. What's your point?
This comment sums it up..

"Wright Brothers: We have an idea for heavier-than-air flying machine.
Thunderf00t: Clearly you are snake-oil merchants. Ball-park numbers, your engine is going to be highly inefficient as to be impractical over any great distance. Not to mention that this 'aerofoil' is fine for birds, but structurally deficient on the scale that you are going to need it.
Wright Brothers: We'll try it anyway.?"

You are using the youtube video as your only proof that you think it wont work...
Who said anything about proof? I posted it as presenting an alternative point of view.

Edited by xRIEx on Wednesday 12th October 10:17

Speed addicted

5,561 posts

226 months

Sunday 23rd October 2016
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xRIEx said:
I don't know for sure, but I'd guess that oil, water and steam have heat management systems by the very nature of transporting oil, water and steam. Almost like car engines (and other things that generate heat) are cooled by water or oil.
They use expansion loops, sections of the line at right angles to allow the long straight bits to expand without buckling the pipework and knocking it off the supports. I imagine that it would make for an interesting ride at 900kph.




FarmyardPants

4,099 posts

217 months

Wednesday 26th October 2016
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hehe

maffski

1,866 posts

158 months

Friday 28th October 2016
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Axial expansion joint? If it can't cope with the pressure you could wrap one joint inside another and step the pressure.

Considering the amount of energy you would be using anyway perhaps insulation and active temperature control could allow expansion at the terminus only.

hidetheelephants

23,776 posts

192 months

Friday 28th October 2016
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Indeed, that was the point I was making earlier in the thread; bellows joints capable of sustaining partial or total vacuum are available off the shelf, this is existing tech not vapourware.

pherlopolus

2,087 posts

157 months

Friday 28th October 2016
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Hey, lets not let facts get in the way of a good discussion smile

Speed addicted

5,561 posts

226 months

Friday 28th October 2016
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maffski said:


Axial expansion joint? If it can't cope with the pressure you could wrap one joint inside another and step the pressure.

Considering the amount of energy you would be using anyway perhaps insulation and active temperature control could allow expansion at the terminus only.
Very rarely see them in the oil industry (in my experience) possibly because of the possibility of fatigue cracking in difficult to examine places.

I think the main problem would be one that was mentioned earlier. What if the capsule leaks or breaks down somewhere away from an exit?
Also think of the terrorism possibilities. You would have large areas to protect where a small hole or damage to the line could cause serious problems.

jammy-git

29,776 posts

211 months

Friday 28th October 2016
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Speed addicted said:
Also think of the terrorism possibilities. You would have large areas to protect where a small hole or damage to the line could cause serious problems.
Isn't that a problem with many existing modes of transport?

Einion Yrth

19,575 posts

243 months

Friday 28th October 2016
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Speed addicted said:
xRIEx said:
I don't know for sure, but I'd guess that oil, water and steam have heat management systems by the very nature of transporting oil, water and steam. Almost like car engines (and other things that generate heat) are cooled by water or oil.
They use expansion loops, sections of the line at right angles to allow the long straight bits to expand without buckling the pipework and knocking it off the supports. I imagine that it would make for an interesting ride at 900kph.



I would imagine there are other potential fixes for the issue, but it gave me a chuckle, thank you.

Beati Dogu

Original Poster:

8,864 posts

138 months

Friday 27th January 2017
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They're running the Hyperloop pod race event this weekend at SpaceX HQ in LA. They've built a mile long circuit to play with.

Flooble

5,565 posts

99 months

Friday 27th January 2017
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Is there a little 7-year old entered in the race by a couple of weird blokes in pyjamas?

Beati Dogu

Original Poster:

8,864 posts

138 months

Friday 27th January 2017
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I hear his midichlorian count is off the chart.


Here's details of the various teams:

http://uk.businessinsider.com/spacex-hyperloop-com...

Edited by Beati Dogu on Saturday 28th January 00:28

Flooble

5,565 posts

99 months

Saturday 28th January 2017
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Interesting range of pods there, from near soap-box racer to almost fantastical designs that don't appear to be possible.


Beati Dogu

Original Poster:

8,864 posts

138 months

Sunday 29th January 2017
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Yes, the Japanese university one, the Keio Alpha, looks suitably futuristic. Definitely some bullet train influences there.

https://www.youtube.com/watch?v=dMmpZrI5Lo4

AstonZagato

12,652 posts

209 months

Sunday 29th January 2017
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Monty Python said:
I wouldn't - if the "vacuum" system fails then you're dead, and putting something like that out in the open in a county filled with people with guns is asking for it.
Is that right? I thought the vacuum was to enable it to get to great speed without needing huge energy to propell it. If the vacuum failed, the tube fills with air and the pod slows due to air resistance. Or am I missing something?

Speed addicted

5,561 posts

226 months

Sunday 29th January 2017
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AstonZagato said:
Monty Python said:
I wouldn't - if the "vacuum" system fails then you're dead, and putting something like that out in the open in a county filled with people with guns is asking for it.
Is that right? I thought the vacuum was to enable it to get to great speed without needing huge energy to propell it. If the vacuum failed, the tube fills with air and the pod slows due to air resistance. Or am I missing something?
Well, I was thinking about this too.

If you have a small leak the capsule would slow down gradually, but if there is a big leak and you're going 900kph I imagine it would be a very sudden deceleration.

Also the seals on the capsule would have to be very good, again if something failed in a big way you don't have the option to do much about it really. If an aircraft has pressurisation issues they can at least fly lower.

What if the capsule breaks down or catches fire, you would be stuck between stations in an environment you couldn't survive. It's not just airless, it's a vacuum so things like scuba masks wouldn't work, you would need a space suit.
It would be like being in a submarine that couldn't surface. I think the biggest problem with this wouldn't be the technical side, it would be selling it to people as a safe way of traveling.


Edited by Speed addicted on Sunday 29th January 10:12

davepoth

29,395 posts

198 months

Sunday 29th January 2017
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Speed addicted said:
What if the capsule breaks down or catches fire, you would be stuck between stations in an environment you couldn't survive. It's not just airless, it's a vacuum so things like scuba masks wouldn't work, you would need a space suit.
Edited by Speed addicted on Sunday 29th January 10:12
Maintenance would demand that the pipe can be repressurised in small sections anyway, so that same process would work for emergencies - block the pipe, blow a valve, and air will rush in in seconds, equalising pressure and stopping the vehicle quickly. Compared to an on-board plane fire it would be much safer.


annodomini2

6,860 posts

250 months

Sunday 29th January 2017
quotequote all
Speed addicted said:
AstonZagato said:
Monty Python said:
I wouldn't - if the "vacuum" system fails then you're dead, and putting something like that out in the open in a county filled with people with guns is asking for it.
Is that right? I thought the vacuum was to enable it to get to great speed without needing huge energy to propell it. If the vacuum failed, the tube fills with air and the pod slows due to air resistance. Or am I missing something?
Well, I was thinking about this too.

If you have a small leak the capsule would slow down gradually, but if there is a big leak and you're going 900kph I imagine it would be a very sudden deceleration.

Also the seals on the capsule would have to be very good, again if something failed in a big way you don't have the option to do much about it really. If an aircraft has pressurisation issues they can at least fly lower.

What if the capsule breaks down or catches fire, you would be stuck between stations in an environment you couldn't survive. It's not just airless, it's a vacuum so things like scuba masks wouldn't work, you would need a space suit.
It would be like being in a submarine that couldn't surface. I think the biggest problem with this wouldn't be the technical side, it would be selling it to people as a safe way of traveling.


Edited by Speed addicted on Sunday 29th January 10:12
They're not intended to be vacuum, just low pressure, think 60-70k ft, propulsion is intended to be electric, with effectively an electric 'jet' engine. No air = no propulsion.

Some of the airflow over the pod is intended to stabilise the pod in the tube.