Originally Posted by nathandance1996
either the air drive train or petrol electric using an alternator due to legal reasons
But UK e-bike regulations limit you to 250W, right? That's not really worth the trouble if you ask me. Do you think you could use a "250W" rated motor to deliver larger amounts of power as needed with an alternator as a power source? I don't really understand your angle here. But I admire your spirit of ingenuity.
Using the leaf blower as a pure reaction motor (jet engine) is likely to develop more thrust at cruising speed, and less noise overall, than puffing at paddles on the spokes.