oooh, ooh how about a compressed air motor and drive system, like in the european compressed air cars.
Start with mounting a

, 4500psi carbon fiber air tank
then the fun of designing an ultra small, rotary compressed air motor, that will be small enough to fit in the wheel, but still spin fast enough to be able to, when geared down, drive you with some, perhaps fairly significant speed (at 4500psi, you dont need a hell of a lot of air to drive it) by the way (
www.engineair.com.au for motor design ideas)
this way you fill the tank with compressed air, it makes no electro-magnetic pollution, it makes no noise, until you push the throttle, which will open up a pressure valve it up and propell you forward
juust another thought and since the motor will have to be mounted on the forks, you really dont have to worry about air line getting twisted, as long as it runs with the forks and has some play in it, it should not effect your steering
Juust another idea

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