Has anyone really been far even as decided to use even go want to do look more like?

I posted this on numerous physics forums and I never got a response. That was well over 12hours ago.

The following formula is used to calculate actual muzzle velocity of a projectile, given the velocity of the projectile at some distance from the muzzle.

Not that (n - 1)_n should actually be:
(n - 1)
__n

V_m = V_c { 1 + (P / P_a) (A_k / CcosΘ ) (V_c / a)^{(n - 1)_n D_mc}

V_m = muzzle velocity
V_c = instantaneous velocity as measured at some distance from muzzle
P / P_a = weight density of air
A_k, n = Mayevski velocity at specific subrange
C = ballistic coefficient of projectile
Θ = launch angle
a = acceleration due to gravity
D_mc = distance between muzzle and where instantaneous velocity was measured, such as centre of a chronograph

Thank you very much sage, however we did not have the ability to measure an instantaneous velocity at any point.
However, what carn and i are looking for, is more a way to convert the psi of our pressure chamber into a force, and calculate how much force acted upon the projectile. This will give f=ma, and because we have mass, we can find a, and then we use simple formulas of motion to calculate the velocity the instant at which the projectile leaves the barrel, and then the rest is projectile motion which we know.

In that case this will help: http://ffden-2.phys.uaf.edu/211.fall2000.web.projects/J.%20Jones%20and%20T.%20Kenny/Projectile.htm

Read through the whole thing, and pay particular attention to (8) when you get up to it.

WOW, i cant believe its as simple as f=pc, because we knew we needed the cross sectioon, but every was saying calculate the force applied to a 1x1m piece of paper, and we were confused because our psi was based on a volume, hence more force would be applied for different volumes but same pressure.

BUT SERIOUSLY, thank you sage.
Thread answered, you can now lock.

Sage. I will have your babies if you want.

Anytime. Glad my education hasn't gone to waste.

See kids? Stay in school and out of drugs!

u gotta find the horizontal and vertical components from wat i remember. diagram would be so much easier to work off ( if u have a diagram that is )