Posted by: Felix "flu" Lu on July 18, 2003 at 14:37:19

Actually it's not too that sophisticated... let's change all the units to SI units first: 300ft/s = 91.4 m/s 3.2g = 3.2e-3 kg Pressure (P) is just Force per area. Force is = mass * acc. acc. = velocity/time = 91.4 / 1.67 millisecs. (time = 6 inches (what I took as an effective barrel length) divided by 300 ft/sec) so P = (m*v)/(t * area) where area is the pi*(.34 inches)^2 if you plug the numbers in you get about 108 lbs/sq in. Check my math, but I think it is correct. keep in mind that this would be the bare minimum since other factors such as friction are not accounted for. : I am in need of some paintball math help, please keep in mind that my math career stopped at algebra 2. I may be asking the wrong question, but if you under stand what I'm getting at please offer some assistance. : I need to know how many cubic inches at what psi is need to propel a paintball at 300 ftps. Let’s say the average paintball weighs about 3.2 grams. : Thanks for any help you can offer

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