I'm trying to establish the speed of a small jet craft as it accelerates down the runway. What I know is that the jet engine generates 2,300 lbs of thrust, and that the total weight of the craft at take-off is 22,000 lbs. I don't have the coefficient of drag but it's a pretty advanced design. How difficult is it calculate the speed for any given distance and the length of time it took to get there? Does anyone have a formula?