recalling :)...

Drag = 1/2 A * Cd * rho *vsquared

A = frontal area (any one know this for Vanagon/Westy?)
Cd = drag coeffficient, I have seen 0.44 stated for Vanagon
rho = density of air

Density of air at sea level = 1.226 kg/cubic meter.

We should be able to estimate

something! from above equation if we ignore rolling/mech resistance. Usually
we can say that those factors are constant over limited speed range.

At least one can get the minimum power required to go a given speed.

Alistair
--
'82 Westy -> diesel converted to gas in '94
albell@uvic.ca
http://members.shaw.ca/albell