Concorde. Rail Gun. Air Hockey.
Under low pressure, inside the Hyperloop tubes,
pods mounted on thin skis made of "Inconel" a super
alloy of SpaceX that can withstand high pressure and heat.
At front of the pod is a pair of air jet inlets at the nose.
Electric turbo compressor pumps the air from the
nose through the skis to make an air cushion.
Magnets on the skis, plus an electromagnetic pulse, to
give the pod its initial thrust; reboosting motors
along the route to keep the pod moving.
Warm air inside the tubes, high tailwinds, no sonic boom.
“The pod can go just below the speed of sound relative to the air.”
Elon Musk, Chairman, Architect & CEO
Hyperloop Blog : http://www.teslamotors.com/blog/hyperloop