71GSSDemon said

I believe the formula for top speed HP goes as:

($ x APR) + 5W = S x .99, where

$=$
APR = variable
5W = lodging
S = speed
.99 = "I'll be back next year" coefficient



And: I think it goes... all the power you can afford dose not go as fast as you want.

Click to expand...

71GSSDemon said

From Carroll Smith's book [Tune to Win] Drag HP= CD X Frontal area X ( Velocity in mph) to the 3rd power divided by
146,600

His example Drag HP = (.65) X ( 17 FT) x (180 mph) to the 3rd power OR 180 X180X 180
--------------------------------
146,600 = 439 HP





It is proportional to the cube of the speed. The force due to drag is proportional to the square. To get power you have to multiply by the rate. Therefore the power is proportional to the cube of the speed.

If it takes 100 hp to go 100 mph then to go 200 it is the ratio of (200/100) cubed times 100 hp or 800 hp.

Click to expand...