Live data from Hacker News

Hyperloop

spacex.com

121–130 of 983 posts

Re: Hyperloop

#121

I think it's interesting to devote so much space in the introduction to hypothetical supersonic air travel. Might this be what Musk actually intends to do next?

In an interview last we he stated that his next company would be vertical take off supersonic electric jet, if he decided to start another company. He said he's not likely to start another company any time soon.

Re: Hyperloop

#122
post #109
post #99

I'm impressed, but I'm afraid Hyperloop's operation is modeled after airplanes, while the actual use of the system would be closer to a city bus. >All capsules would have direct radio contact with station operators in case of emergencies, allowing passengers to report any incident, to request help and to receive assistance. In addition, all capsules would be fitted with first aid equipment >Typical times between an e…

[deleted]

Forks for runaway pods at regular intervals ? Like the ramps they build for runaway trucks with brake failure.

Re: Hyperloop

#123

So, it's a two-lane highway where the cars are 5 miles apart? How many people will be able to use this thing?

From the report: "...with capsules departing as often as every 30 seconds from each terminal and carrying 28 people each. This gives a total of 7.4 million people each way that can be transported each year on Hyperloop."

That seems like a pretty optimistic estimate, but I suppose its a guessing game for such a hypothetical system anyways. Also, for comparison BART ridership tops up at over 100 million a year[1], and 6 million fly between LA and SanFran annually[2].

[1] http://www.bart.gov/docs/barttimes/BTimes0707.pdf

[2] http://cahsr.blogspot.com/2009/10/la-sf-nations-second-busie...

Re: Hyperloop

#124
post #64

Earlier quoted context omitted.

Does it support multiple pods in the tube at once?

Yes, but no discussion of how you'd bring the system down if one broke down mid-trip or how you'd bring it back up. The individual cars only carry power to maintain speed, no to accelerate, so if they have to stop because something goes wrong, a whole bunch of people are stuck in the middle of nowhere without a toilet (or air?)

There's some discussion on pages 52-54 of the PDF.

Re: Hyperloop

#126
post #66
post #32

"In the case of the Hyperloop, Musk started focusing on public transportation after he grew disenchanted with the plans for California’s high-speed rail system." And who says that big government stifles entrepreneurial innovation? If ALL Musk does with the Hyperloop announcement is shed more light on the potential debacle that is to be our $70b+ high-speed rail in California, we owe him a debt of gratitude. PS - Dire…

[deleted]

You misread, I think. He was stating that it is a common claim that government can stifle innovation, particularly in the transit sector (look at the trouble that Uber has to go through in every large market to fend off government-backed taxi monopolies). In this case, it appears that government failure may help spur innovation in a very costly sector.

Re: Hyperloop

#128
post #66
post #32

"In the case of the Hyperloop, Musk started focusing on public transportation after he grew disenchanted with the plans for California’s high-speed rail system." And who says that big government stifles entrepreneurial innovation? If ALL Musk does with the Hyperloop announcement is shed more light on the potential debacle that is to be our $70b+ high-speed rail in California, we owe him a debt of gratitude. PS - Dire…

[deleted]

> Market is wide open

For a major infrastructure product? No, even if they could secure all the requisite permits and funding, which I can only imagine would be a nightmare to all but the wealthiest entrants, urban development would make actually putting the thing in the ground its own immense obstacle. The government uses the long-established practice of eminent domain to ensure that its projects may proceed unimpeded. Private industry doesn't have that, and we shouldn't consider giving it to them.

Re: Hyperloop

#129
post #80

The aerodynamic power requirements at 700 mph (1,130 kph) is around only 134 hp (100 kW) with a drag force of only 72 lbf (320 N) Mind blown.

But that's at a pressure of 100Pa (1/1000 atm). How much power does it take to maintain a vacuum of 1/1000atm in a tube hundreds of miles long? It seems this point is skipped over in the whitepaper, so perhaps its negligible. Edit: yes I was referring to the power to sustain a vacuum in a leaky system, of course no power is required to maintain a vacuum in a perfectly sealed system :)

I think that's handled by the rooftop solar cells.

Re: Hyperloop

#130

Earlier quoted context omitted.

How is that any worse than standard commercial air travel? Plus, really, you are talking about a thirty-minute journey.

The journeys currently envisioned by the hyperloop are more appropriate for trains, and Acela (for example) is actually pretty roomy

I don't think Acela journeys are 30 minutes long, though.
Post reply on HN