Please clarify a few things. From previous posts I assume that D is a constant (not distance) between 0 and 1, and T = time, correct? You have the factor (T-1) in the expression for wind speed - does that mean that from T=0 to T=1 the wind blows in one direction, and after T=1 the wind blows in the other (i.e. the sign of W changes from negative to positive)? Also each of the two expressions you provided are velocities (not power), right? Finally, I trust you ar aware that the W component completely swamps out the V_i component after just a few seconds.