Hyperloop
The Hyperloop is a proposed "fifth mode of transport" (the other four being planes, trains, cars and boats)[notes 1] that was unveiled by Elon Musk in 2013. It involves a tube evacuated to very low pressure in which pods are propelled forward, using magnets, at speeds in excess of 1000 km/h. In essence it is a pneumatic tube on steroids or a magnetically levitated train inside a vacuum tube. Whether or not the Hyperloop proposal will come into fruition remains in doubt.
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So how is this supposed to work?
“”Any intelligent fool can make things bigger and more complex, it takes a touch of genius and lot of courage to move in the opposite direction. |
—E. F. Schumacher[1] |
Most of an Earth-bound vehicle's energy is used to counteract the forces of friction, gravity and atmospheric drag. Without these, anything moving keeps moving indefinitely. So the idea is you remove the atmosphere, and use some system to levitate the vehicle slightly above the ground. Existing maglev
Musk's proposal calls for relatively small capsules seating less than 30 people, but headways[notes 3] as short as thirty seconds. A 30-second headway is something even modern subways don't do, mostly because loading and unloading passengers takes longer than that and also due to safety considerations (30 seconds is just not enough to safely stop if the vehicle in front of you stops). Of course the loading and unloading problem could be solved by having several parallel loading areas (i.e. platforms) that somehow merge to the main tube, but Musk does not really answer the question of how exactly merging and branching would work either.
So does this actually work?
In short: it wouldn't. While some of the inherent design problems might be fixable, their combined magnitude would make it an economic impossibility to build. And that's before you take land costs and other minor details into account. [2] And that's not even getting into the political difficulties behind getting large scale infrastructure built, especially in the U.S. Then there are the engineering problems like dealing with the capsules heating up from air compression (as the tube will not be a total vacuum), or the tube needing sub-millimeter tolerances. Sub-millimeter tolerances are not that difficult to achieve, but doing so is expensive and maintaining it over hundreds of miles is a major headache. Oh, and then you have to deal with earthquakes, or even just simple thermal expansion of the tube and capsules. And it's unclear how the proposed thirty-second headway is supposed to work with the proposed 0.5g braking deceleration, given that at the proposed top speed of 1220 km/h there is not enough space or time for a capsule to brake before it slams into a capsule that experienced catastrophic failure in front of it. Not to mention that even at the blatantly unrealistic headways Musk proposes, Hyperloop would have a capacity less than a third that of high speed rail.
Also Musk's proposal envisions building a system not directly between downtown LA and downtown San Francisco, but instead from Sylmar to somewhere in the East Bay, which means you still have pretty much the same problems as with air travel. The ride itself is supposed to take only half an hour (at Musk's fantasy estimates), but unless that precise suburb is your final destination you will spend an hour or more getting to your actual destination. There is a reason why HSR (high-speed rail) kills competing air service even at two hours' travel time. You see, land downtown is expensive. And more people who could have stilts in their front yard means more NIMBYs trying to derail your project. California HSR costs as much as it does in part because it goes downtown instead of considering getting people to their final destination "someone else's problem". To add insult to injury, Musk plans to include TSA-style nut-grab brigade security theater, so taking the Hyperloop instead of Southwest won't even spare you that.
What was Musk's intention in promoting this?
First of all, the proposed route links—by sheer accident of course—the place in LA closest to Musk's home to the place in the Bay Area closest to Musk's workplace. And given the way Musk bashed California high speed rail when he announced his project, it is not unreasonable to assume that part of his intention was to keep the latter from getting built.[3] Unsurprisingly, a favorite line of attack by anti-HSR people in California has become "bla bla bla Hyperloop is cheaper bla bla Hyperloop is better bla bla Elon Musk is a genius".[notes 4] Of course the fact that Elon Musk is currently selling cars
In March, 2018, the city of Cleveland, Ohio, inked a $1.2-million feasibility study of the construction of a 340-mile Hyperloop line between it and Chicago, Illinois. Not surprisingly, critics voiced their concern that the technology does not even exist yet, which Hyperloop Transporation Technologies admits. On the bright side, if investigators conclusively show the proposal to be unrealistic, it could potentially pave the way for the construction of a high-speed rail network in the Midwest,[notes 5] currently in need of an economic stimulus.[5]
Similar things
As you may know, similar proposals have been made in the past and some have actually gotten built, be it a subway line
Progress
Prototype Capsule
In October 2018, Hyperloop Transportation Technologies (Hyperloop TT) unveiled its first full-scale Hyperloop capsule in Spain. The capsule is made out of a composite material called Vibranium (after the fictional Marvel supermetal, because of course), 82 carbon fiber panels, 72 sensors, 75,000 rivets and 7,200 square meters of fiber. Hyperloop TT will next send it to France for additional testing and optimization before letting it run on commercial tracks.[6]
DC/Baltimore Loop
On April 17, 2019, a U.S. federal agency released a roughly 400-page report detailing its in-depth investigation into the extent of Russian influence in U.S. Politics human and natural environmental impacts of Musk's proposed 35-mile loop between Washington, DC and Baltimore, MD.[7] Its contents reveal a much more scaled-back, not-so-"hyper" version of the Hyperloop originally envisioned. Rather than speeding commuters between the two cities along at 1200 kph in a vacuum-sealed Vibranium pod, the proposal outlined in the draft Environmental Assessment describes driverless, battery-powered vehicles being lowered into one of two ventilated tunnels, and travelling down them at 240 kph for a ~15 minute journey. Due to station capacity limitations, usage would be initially capped at approximately 1,000/day, roughly the equivalent of a single double-decker MARC train (which, in comparison, takes about 55 minutes to make the same journey with five additional stops, and is one of several train and intercity bus routes already between the two cities). There is no official cost estimate as of writing, and approvals are still required from a half dozen agencies and state DOTs, so prospects are still shaky for the project.
While some, like Maryland governor Larry Hogan, are gung-ho about the project, others are not so on board. Virginia Chief of Rail Transport Michael McLaughlin, after being taken on a demonstration ride in the California test track, noted that it was basically just "a car in a very small tunnel."[8]
External links
- Economists don't believe the Hyperloop | Al Jazeera America:
- The Flawed Plan For Hyperloop Construction | Business Insider
- Loopy Ideas Are Fine, If You’re an Entrepreneur | Pedestrian Observations - This excellent article explains why Musk's numbers don't pass a smell test.
- This comment is well worth reading
- The Future of Travel — the Hyperloop. DW Documentary.
See also
Notes
- He's left out bicycles, helicopters, airships, motorcycles, hovercraft, horses, or human legs. And that's an incomplete list.
- You could also employ a tube that is mostly airtight, but that would drive up the energy use for the vacuum pumps to a ridiculous degree.
- a technical term for the time between the departure of two vehicles
- Additional Randroid talking points about the evils of government or the genius of Saint Elon is not mandatory but highly likely.
- Please see the Chicago Hub Network
File:Wikipedia's W.svg .
References
- E. F. Schumacher, Wikiquote.
- http://bits.blogs.nytimes.com/2013/08/15/could-the-hyperloop-really-cost-6-billion-critics-say-no/?_r=0
- http://stopandmove.blogspot.de/2013/08/hyperloop-proposal-bad-joke-or-attempt.html
- Even this fencesitting or mildly supportive piece fears for the effect Hyperloop might have on HSR.
- The Hyperloop: The future of travel or a fanciful space-age hamster tube? Chicago Reader. March 5, 2018.
- HyperloopTT’s first full-scale passenger hyperloop capsule aims for 2019 operation. Global Railway Review. October 2, 2018.
- "DOT Completes Review of Draft Environmental Assessment for the Proposed “Loop” Tunnel Project Between Baltimore and Washington, D.C.," U.S. Department of Transportation.
- "Actual Transportation Professionals Unimpressed With Musk's Boring Company," Gizmodo