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Old 02-02-2016, 01:34 PM   #21
JeffDowntown
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Re: Hyperloop to Boston?

Nothing in the battery world comes close to the energy storage density needed to make battery powered flight practical.

You would basically consume your full payload weight in batteries. Not a very useful vehicle.

Liquid fuel like Jet A is a very high energy density material.
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Old 05-02-2019, 07:33 PM   #22
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Re: Hyperloop to Boston?

Out of curiosity, what has hyperloop Said is the ideal medium for its tunneling?

Nobody likes sand. The soft silt & gravel soil of Boston made the Big Dig hard.

Being in a chalk layer was supposed to make the Chunnel easy to build. Soft rock seems ideal until it collapses under its own weight without a liner or reinforcement.

The NATM through granitic base rock has the virtue of not needing a support liner but it's still an incredibly "manual" process and ends up needing just as much water management if water is present.

Are the Boring Company's machines (which are really just rebranded European machines) so awesome that they don't care about the local geology?
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Old 05-03-2019, 11:54 AM   #23
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Re: Hyperloop to Boston?

I may be a bit in the dark about this, but what is Hyperloop? Some new method of getting around that would embrace Boston with its presence ?
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Old 05-03-2019, 11:59 AM   #24
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Re: Hyperloop to Boston?

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Originally Posted by Jahvon09 View Post
I may be a bit in the dark about this, but what is Hyperloop? Some new method of getting around that would embrace Boston with its presence ?
http://lmgtfy.com/?q=hyperloop
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Old 05-03-2019, 05:45 PM   #25
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Re: Hyperloop to Boston?

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Originally Posted by Arlington View Post
Out of curiosity, what has hyperloop Said is the ideal medium for its tunneling?

Nobody likes sand. The soft silt & gravel soil of Boston made the Big Dig hard.

Being in a chalk layer was supposed to make the Chunnel easy to build. Soft rock seems ideal until it collapses under its own weight without a liner or reinforcement.

The NATM through granitic base rock has the virtue of not needing a support liner but it's still an incredibly "manual" process and ends up needing just as much water management if water is present.

Are the Boring Company's machines (which are really just rebranded European machines) so awesome that they don't care about the local geology?
What's the soil like in Southern NE? It seems like an option would be to run the tunnel to Providence or some other major city and then run express rail to Boston.
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Old 05-04-2019, 02:48 PM   #26
JeffDowntown
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Re: Hyperloop to Boston?

Quote:
Originally Posted by Arlington View Post
Out of curiosity, what has hyperloop Said is the ideal medium for its tunneling?

Nobody likes sand. The soft silt & gravel soil of Boston made the Big Dig hard.

Being in a chalk layer was supposed to make the Chunnel easy to build. Soft rock seems ideal until it collapses under its own weight without a liner or reinforcement.

The NATM through granitic base rock has the virtue of not needing a support liner but it's still an incredibly "manual" process and ends up needing just as much water management if water is present.

Are the Boring Company's machines (which are really just rebranded European machines) so awesome that they don't care about the local geology?
Modern TBM don't have a lot of trouble with lose glacial till, Boston blue clay, etc. The good boring companies (almost all European) can tune them for most substrates.

People always forget the MWRA contracted TBM for the huge storm water reservoir under Day Blvd. on the South Boston shoreline. 2.1 miles of TBM tunneling, 17 ft diameter, all through loose Boston substrate. Well under schedule and budget for completion. We are way too afraid of TBM in the US because the local contractors don't get the work (because they don't have the skills), so they badmouth the capabilities.

Now equivalent tunneling for Hyperloop distances -- not sure that makes sense. But for new subway connections in Boston -- sure, why not. Cut and cover is way more disruptive to the surface environment.
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Old 05-04-2019, 06:51 PM   #27
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Re: Hyperloop to Boston?

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Thanks, Satler!!

Looks almost like the Maglev!
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