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Originally Posted by Old Mechanic
If 4.5 hp can propell my 200 pounds at 40 MPH and 150 MPG, why would you need more than the 25 HP I will have in my 3 wheeler at 1100 pounds...
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For climbing hills, and accelerating. As others have pointed out, with decent aero it doesn't take much power to cruise on level roads. IIRC 65 mph takes less than 17 hp in my Insight.
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...versus the 50 cc super cub at 350 pounds, me included in both even including another passenger (not on the super cub).
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50 cc? Maybe if you have a big RC model of one. The (stock) Super Cub has an O-235 engine or larger.