> with the formula HP=(CD*Q*A*(V^3)*6.8)/10^6

> The amount of power climbs quickly
> from 45 on up as the air pressure builds as the cube of the speed.

Actually it's the square of the speed.
The power builds as the cube (as you note in your formula).
Energy = force x distance.
And power = Energy per time
So, power = Velocity x Force.
So, the pressure has a velocity^2 term and the extra V is to convert 
the pressure to power.

It is interesting to compare that formula to my recently noted

            Drag = 0.5 x Cd x Rho x A x V^2



            RM

Also - density is in slugs/ft^3 fwiw.
We must have far smaller slugs here down under, as we could fit far 
more than 0.0024 of one in a cubic foot. 

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