"Excellent! Now all we need is an affordable, high-capacity battery for cars."
Hey, install a mini-version on top of the car, or in back of the electric powered pickup - perpetual motion in the making - and you have a built in governor - reach 70 mph, the thing goes to free-wheeling, and no power until the thing slows down!
Was thinking the same thing for my sail boat. Not enough wind, I'll just put a fan at the back and blow the sails. I can use a windmill at the front to generate the power to drive the fan at the back.