| Here is an Excell spread sheet that I made to graph the trajectory of a projectile, taking into account air resistance. It asks for, Muzzle velocity, (which you could calculate with a spread sheet like Ed has, or measure with a cronograph), Drag coefficient (which i just use a figure like .5 to start with, but you could figure it out by using different values and accually firing you're cannon with the same figures in the program and take the one that best matches the distance fired), Air density (with which you can calculate on the sheet knowing barometric pressure, temp, and relative humidity) Barrel diameter, and firing angle. If you're confused, feel free to E-Mail me, and i would be happy to answear any questions. I plan on adding more Software that I make, I'm working on making this program into an application that doesn't need Excell. I've also got other Software that Geocities won't let me upload, if you're interested, just let me know and i'll let you know what I have. |