- #1
CopperHead4750
- 4
- 0
Hopefully you smart guys can understand this post
I recently have bought an airsoft pistol that shoots 302fps and I thought it would be fun to calculate the max distance & stuff for the bb including air resistance. The problem is including air resistance into the equation.
Here's the stats:
mass of bb= .12g
diameter of bb= 6mm (.006m)
muzzle velocity for .12g bb = 302fps (92.0496m/s)
After reading stuff on the net, I aparently need the equation D=(pCA)/2, where p is the density of air (about 1.2101 kg/m3), C is drag coefficient (around .47 probably?), and A is the area of the bb looking at front (pi*r2 = pi*(.003m)2 = 2.8274*10-5 m2)
When I plug the numbers in, D= 8.04046*10-6
I'm sort of lost after this step, aparently Acceleration=-DV2 --> Ax=-DV(Vx) and Ay=-DV(Vy)
I tried plugging the numbers in but the answer was only somewhere around .04 which I'm pretty sure isn't right at all.
My main goal is to put it into a parametric function so I can see it visually with distance and time:
SO, what I'm sure is right (without air resistance):
X1T=92.0496cos(35)
Y1T=92.0496sin(35)-(1/2)9.8T2
What is the air resistance acceleration and how do I plug it into that equation?
I recently have bought an airsoft pistol that shoots 302fps and I thought it would be fun to calculate the max distance & stuff for the bb including air resistance. The problem is including air resistance into the equation.
Here's the stats:
mass of bb= .12g
diameter of bb= 6mm (.006m)
muzzle velocity for .12g bb = 302fps (92.0496m/s)
After reading stuff on the net, I aparently need the equation D=(pCA)/2, where p is the density of air (about 1.2101 kg/m3), C is drag coefficient (around .47 probably?), and A is the area of the bb looking at front (pi*r2 = pi*(.003m)2 = 2.8274*10-5 m2)
When I plug the numbers in, D= 8.04046*10-6
I'm sort of lost after this step, aparently Acceleration=-DV2 --> Ax=-DV(Vx) and Ay=-DV(Vy)
I tried plugging the numbers in but the answer was only somewhere around .04 which I'm pretty sure isn't right at all.
My main goal is to put it into a parametric function so I can see it visually with distance and time:
SO, what I'm sure is right (without air resistance):
X1T=92.0496cos(35)
Y1T=92.0496sin(35)-(1/2)9.8T2
What is the air resistance acceleration and how do I plug it into that equation?