So, I guess I am a bit off on my guess of power, although I think 4 hp will push an insight well past 20 mph on flat ground. Perhaps you might need to step up to a 10KW gennie. Too bad there aren't affordable microturbine gennies out there yet. I think they are the future of vehicle hybrid propulsion. Another interesting one i read about is someone, audi, i think, doing a 250cc rotary powered gennie in this application. rotaries are not very good ICEs from an efficiency point of view, but, they are crazy good from a lbs/hp one. And, unlike microturbines, they already have a long history as vehicle propulsion.
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