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I fed an approximation of Ironside's Honda specs into the calculator at the top of the page,
180 kg
rolling resistance .018
cd .4
frontal area 5.5 squ ft
engine efficiency .22
Assuming that is correct I get a requirement for 3.56 hp at 55 mph or 2.84 hp at 50 mph.
It sees logical to match the engine output to the aero power requirements.... so what rpm at 50 mph?
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