Elon Musk's Hyperloop: 30 Minutes In Windowless 800-MPH Pod?

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Tesla CEO Elon Musk is a man of many and advanced interests, and his latest notion--the Hyperloop rapid transit system revealed as a concept yesterday--fits into his vision of a very different future.

In a nutshell, the Hyperloop is a system in which people board pods inside an elevated metal tube on pillars that carry them from San Francisco to Los Angeles in about half an hour, at speeds up to 800 miles per hour.

It was Musk's reaction to the proposed California High-Speed Rail project that is to connect the same two cities, and ultimately run from San Diego to Sacramento, that got him thinking about a Hyperloop concept.

Expensive, slow 'high-speed' rail

That high-speed rail is a ground-based system that uses conventional fast-train technology. It's projected to cost $70 billion to complete by 2029, with the first section slated to begin construction within the year.

If the history of large infrastructure projects holds true, the final cost might exceed $100 billion.

Musk called the proposed California high-speed rail system "both one of the most expensive per mile and one of the slowest in the world."

His Hyperloop system, he says, could be built for a tiny fraction of that cost--$6 billion to $10 billion, he suggests.

In his preface, Musk wonders whether such a system could become "a fifth mode after planes, trains, cars and boats," cheaper than airplane travel for city pairs up to 900 miles (1500 km) 500 miles apart.

'Revenge of the Electric Car' premiere: Tesla Motors CEO Elon Musk on red carpet

'Revenge of the Electric Car' premiere: Tesla Motors CEO Elon Musk on red carpet

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Freeway rights-of-way

For one thing, riding in a dedicated tube on pylons 50 to 100 yards apart, it could run along the right-of-way of existing freeways, both speeding construction and avoiding land acquisition.

That model has already been used, successfully, to build New York City's AirTrain from the Jamaica train station in Queens to John F. Kennedy International Airport.

Its track runs in a trough constructed out of pre-cast concrete sections on concrete columns running down the narrow median of the crowded Van Wyck Expressway along the same route.

No plans to pursue

Much discussion of and debate over on the Hyperloop concept will now ensue, but Musk has no plans to pursue it at the moment.

He's putting the concept (designed the "Alpha" version) out there for others to critique, though if nothing's happened with it in several years, he said, he might return to it after he's a bit less busy.

“I wish I had not mentioned it,” he noted yesterday in a Business Week interview. “I still have to run SpaceX and Tesla, and it’s f*cking hard.”

Concept drawings for Elon Musk’s 800-mph Hyperloop

Concept drawings for Elon Musk’s 800-mph Hyperloop

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What's it like to ride in?

But one concern that arose for us yesterday is something we haven't yet seen addressed: What would the user experience be?

In the concept drawings and descriptions, two variants are proposed at two different scales.

The smaller of the two would have pods containing single seats within a narrow car something like a very narrow rail car.

The side of that flips up, very much like the "falcon doors" on the concept for the 2015 Tesla Model X electric crossover utilty vehicle.

Its entire nose is a large electric fan that would take in air at high speed to propel the vehicle-think of it roughly as a sort of large jet engine--as well as suspending it just above the surface of the tube on a cushion of air.

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