[kevinvincent]

Why dont you just change the angle of the shooter and keep the velocity constant? Also, the higher the velocity the more linear the frisbee's path. This makes the predicted values much more accurate.

See, the problem with changing velocities to shoot is that when you lower the velocity, you also lower the amount of spin (if you are using a U shaped shooter or a linear one). This causes instability of the frisbee and your equations wont help you there.

If you plan on using a fixed velocity, you can graph the values output from the program and use excel to find a best fit curve (logarithmic). This will simplify your code a lot and will make it more efficient than testing every single angle.