Originally Posted by Bikeguy Joe
Well....we used to use a big leaf blower and just sit on an automotive creeper, and we could get maybe 3-5 mph out of it.
So, with a leaf blower on a bike, you may have a little less rolling resistance, and hit 5-10 mph. Lot's of noise, not much speed, and you would definitely have to pedal on any type of hill.
With a reaction motor, you get more impulse from the motor the faster you go. To put it another way, the closer your vehicle gets to the exhaust velocity, the more HP you net from the same jet of gas.