Quote Originally Posted by Born Again View Post
And while you're here, why bother with "flight time in a vacuum", if the pellet is at a constant velocity due to no wind resistance why not just incorporate muzzle velocity into the equation ? I think "flight time in a vacuum" is a red herring myself.
Did you look at the link that I posted? I thought that the physics/dynamics were described rather well.

The flight-time-in-a-vacuum is, in itself, irrelevant. What is important is the ‘delay’ (caused by the ballistic drag) of the pellet reaching the target. In a vacuum (or if the BC were infinite) then there would be no drag (and hence no deflection).

The sums work out like this :

Wind drift [Feet] = (s * sin(a)) * (t - (v/r)) … where:

t [seconds] = time of flight = 24000 * BC * (Exp(r / (8000 * BC)) - 1) / v
s = wind speed [in Ft/s]
a = angle of wind off trajectory path [degrees]
v = muzzle velocity [in Ft/s]
r = range [in Feet]

Note that the (v/r) term is the flight-time-in-a-vacuum so that (t – (v/r)) is equal to the ‘delay’ caused by drag. If the wind were at 90 degrees to the trajectory then (s * sin(a)) reduces to the windspeed since sin(90deg)=1

Dave