Air-powered dirt bikes close to reality?

What if the very air we breathe could power dirt bikes? Could air possibly dethrone gasoline as our primary energy source for motor-powered machinery? It’s not likely as energy density, efficiency, storage safety, and refueling would be major obstacles on the path to sustainability.

But one brave design student from Australia, Dean Benstead, thought it was worth a try. Given a blank canvas from Yamaha Australia, in the form of a Yamaha WR250R dirt bike, and a DiPietro air engine from Engineair, the student developed his concept using a