Quote:
Originally Posted by cRiPpLe_rOoStEr
I'd rather not consider anything below 13hp for road use, altough the power-to-weight ratio would still be worse than an average 125cc gasser bike such as the Honda CG 125 which had been the most popular motorcycle back here in Brazil, altough it's currently offered with a 150cc engine. But the torque-to-weight ratio of those 400 to 450cc small Diesels still sound favorable...
BTW one thing I have been lurking about would be planetary hub-gears.
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Which is where a Craig Vetter type fairing comes in. From the drag coefficient of his fairing suggested here
http://ecomodder.com/forum/showthrea...-24166-10.html and using the calculator at the top of this page I calculate a top speed for a 10hp diesel powered bike WITH a Vetter style fairing would give 70mph and 120mpg US..... but as you say, 55 mph without a fairing .