Jeff, I concede. I just like to see it sometmes in writing. I found these formulas over at
www.cobranet.com
AirDensity=0.0228645 * baro/(0.5555* (temp - 32) + 273.15)
AeroDragFactor = 1.07556 * AirDensity * cd * farea
RollingDragFactor = (C1 + C2 * mph ** (2.5))
C1 = 0.034667 * (tpress - 35.000000)*(tpress - 45.000000) +
-0.063333 * (tpress - 20.000000)*(tpress - 45.000000) +
0.032000 * (tpress - 20.000000)*(tpress - 35.000000);
C2 = 7.704e-07 * (tpress - 35.000000)*(tpress - 45.000000) +
-8.33333e-07 * (tpress - 20.000000)*(tpress - 45.000000) +
3.148e-07 * (tpress - 20.000000)*(tpress - 35.000000);
AeroHP = (AeroDragFactor * mph**3)/375.0
RollHP = RollingDragFactor * (weight/1000.) * (mph/375.0)
Lift = 0.00256 * farea * clift * mph**2
It lists aero hp as a function of the velocity cubed.