I am attempting to create an excel worksheet that accurately predicts the trajectory of a projectile. Anyways, I am having some trouble with calculating wind along the Z axis, left or right of the target. Y axis is up in the air X axis is towards the target Z axis is left or right of target Fd = force of drag Fw = force of wind Fb = force applied on golf ball p = Rho, density of air Cd = Drag coefficient V = velocity A = Area, which for a sphere I am using A = PI(Diameter)^2 /4 m= mass of golf ball a = acceleration of ball t = time z = distance off from z-axis Force of wind(Fw) -> <- Force of drag(Fd) I am using, Fd = 1/2*p*Cd*V^2*A So, Fw = 1/2*p*Cd*Vw^2*A Vw = simply wind speed, Fw is constant and Fd = 1/2*p*Cd*Vd^2*A Vd = Fw / mass * time then Fw - Fd = Fb Fb = force applied on ball Fb/mass = acceleration of ball then z = Vot + 1/2at^2 I am getting an acceleration that is roughly constant since I am dealing with low wind speeds and short time of flight. However, I am getting extremely low #'s for the distance the ball strays off on Z axis. I get the same answer if I use a constant acceleration or time stamps. Information with just variables is fine with me, but if you want the data for some reason... mass of golf ball = 0.04593 diameter of golf ball = 0.04267 Wind velocity = .44704 m/s Rho = 1.1735 kg/m^3 Cd = .3878 time of flight = 1 sec I am getting 0.0007221 meters off on z-axis. Not sure where I am going wrong... Any help would be much appreciated.