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Old 01-05-2013, 04:57 PM   #78 (permalink)
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Originally Posted by CarterX27 View Post

I understand how the forces are calculated as explained in footnote 7, but I'm not understanding how to calculate power.

I think total power = power drag + power rolling resistance + parasitic loads.

I've used the equations from Pamvec chapter 3 of P = 0.5*rho*Cd*A*v^3 + (Crr * Mtotal * g * v) but it gave me some ridiculously large numbers

What is the formula used in the online tool to calculate power?

If you have your drag force in pounds,at a given velocity,multiply that by your velocity (MPH) divided by 375 to get your horsepower.
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