The traditional wind drift formula is the delay formula. The amount the bullet is slowed is mulitplied by the wind velocity at a lineal rate. Thus the amount of drift is X at 10 mph and 2X at 20 mph as I understand it.

My question is that the force or energy of wind increases with the square of the difference. Thus the energy of wind at 20 mph is four times as great as wind at 10 mph. Then why are the formulas lineal? I would think a stronger wind would have a effect relevant to it's energy and not lineal velocity!

The link is just a discussion of wind drift www.rifleshootermag.com/shooting_tips/determining_wind_values.htm

At that site under "Shooters Tips" there is a good discussion of wind drift showing the lineal values.