[matthewdenny]

Some follow-up questions, if I may?

- are you using a linear or quadratic air drag model?

- how did you validate the model? i.e. How did you determine the proper value for the drag coefficient for this year's game piece?


I used a terminal velocity of 36fps, which someone on here had obtained. To double check it I translated it to a Cd of .58, which given the calculated Reynolds number, corresponded to a NASA page relating drag on a sphere to Cd.

Once I had Cd, I used .01sec intervals starting from the launch position, Calculate Vx, Vy, and Drag Force, I use Drag force and gravity to adjust the numbers for the new angle of motion and Velocity, and repeat to trace the arc.

Here is my Spread Sheet. See the sheets for 'Flight Calc' and 'Flight Path' to get all the details. (You can check out the other sheets too if the interest you)