He talked about it a little bit in the video mentioned in the post. He thinks about "open sourcing"(his words) or patenting the idea and giving the patent to someone who has the financial resources to build it. I guess because of that he hasn't gone into much detail but here is a list of things about the Hyperloop I remembered:
-from downtown LA to downtown SF in 30 Minutes
-cheaper than airplane ticket
-solar panels on the top to make it self sustaining
-energy would be saved without batteries to run at night
-under no influence of the weather
-safe
(-Sarah Lacy made a reference to a TV show/movie with a tube as transportation system, and Elon said it was kind of like that [can't remember the title])
Because it's not subject to the rocket equation, it would basically have the same effect on space access costs as a space elevator.
It is possible in principle for such a device to bring a vehicle up to hypersonic speeds, then regeneratively brake the same vehicle to a stop and recover a fraction of the energy.
Good reading there, but the part about the difficulties notes that it holds nuke-scale energies and states "Therefore for safety and astrodynamic reasons, launch loops are intended to be installed over an ocean near the equator, well away from habitation."
That would exclude the downtown-to-downtown feature.
the part about the difficulties notes that it holds nuke-scale energies
Nuke scale energies get dissipated in the atmosphere on a regular basis by thunderstorms. I suspect it may be possible to ensure that most of the mass burns up in the atmosphere and is dispersed.
That would exclude the downtown-to-downtown feature.
A rocketplane could "rendevous" with the electromagnetic loop at high altitude and then be accelerated and decelerated for the bulk of the cross-ocean trip, then land at an airport.
For what it's worth I think the energy related claims are pretty weak. Technically you can store energy in the kinetic energy of the mass moving at speed, and with diamagnetic ('quantum') levitation the losses are very low... however the costs, overall efficiencies, and dynamics make it barely interesting as a theoretical exercise, and totally worthless as a practical one.
Powering with PV on top of the tube, on the other hand, should be entirely realistic (at least on an average consumption vs average generation basis), and the incremental PV cost will be really low since you'd install it as part and parcel of the tube.
-from downtown LA to downtown SF in 30 Minutes
-cheaper than airplane ticket
-solar panels on the top to make it self sustaining
-energy would be saved without batteries to run at night
-under no influence of the weather
-safe
(-Sarah Lacy made a reference to a TV show/movie with a tube as transportation system, and Elon said it was kind of like that [can't remember the title])
-Sarah Lacy: "Is it possible?" Elon Musk: "Yes!"