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Just so you guys know, this is the math I've been working out, I'll just throw my scratch paper verbatim up here for reference.
HP = v/375 [.00256 x Cd x A x (v^2)] -- that's what I have been working off of.
Assuming a drag coefficient of <= .3 for the trike and the frontal area of the trike I made is 5.04'^2 (6'^2 x .84 as per what it says in the aerodynamics seminar posts) and with a target speed of 45mph, this is the equation.
HP = 45/375[.00256 x .3 x 5.04'^2 x (2025)] -- HP = 4.741 (3538W!!)
Again just for reference in case anyone wishes to see what I did.
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