FPS Formular

[sniper34d]

Hi guys,

I want to calculate my aegs fps on a .2 bb

It shoots 270 fps on a .28 guarder bb.

Anyone know what that equates to? I'm sure it's about 330 but would like a sure figure

[chris_taylor]

Re: FPS Formular

thats about 335-340 as mine was firing 265-270 on .28s and on .2s it was 335-340. i dont think the make will make much difference and the weight will be the same along the board.

[psirus101]

Re: FPS Formular

Theres an article on arnies about this, using it I got;

0.28g+270fps=0.94joule

0.94joule+0.2g=318.01fps

[Kingwell]

Re: FPS Formular

it will never work out accurately... air displacement, barrel length, barrel diameter all come into play..

[Abbadon101]

Re: FPS Formular

Yes but you should be able to tell if you will be alot under or over.

[cracking day]

Re: FPS Formular

319 fps with a .2
286 fos with a .25

There is an iphone app for that.

[mgaraveb]

Re: FPS Formular

319 fps with a .2
286 fos with a .25

There is an iphone app for that.

What's it called

[HuntR]

Re: FPS Formular

it's £0.59 just type in airsoft and it comes up

[mgaraveb]

Re: FPS Formular

Got it

[Wingmann]

Re: FPS Formular

http://www.pegatiros.com/airsoft/CalculadoraFPS.htm

First value is BB weight, second FPS.

It'll give you:
Velocity in m/s, Energy in joules and pressure in feet per inch.

Once you've got the energy in joules, change the weight to 0.2 and the FPS until you get the same energy.

[Rommel]

Re: FPS Formular

Force = Mass/2 x Velocity squared

Where Force = Joules, Mass = Kg, Velocity = M/S

Convert fps to ms then stick in your numbers.

If your using .28 bbs and it is shooting at 270 fps:

270 fps = 82.3 ms
(0.00028/2) x (82.3*82.3)
0.00014 x 6773.29 = 0.95 Joules

Rearranging the equation using a bb weight of .2g will give you:

0.95J = (0.0002/2) x (MS^2)
MS^2 = 0.95 / 0.0001
MS^2 = 9500
MS = 97.47
FPS = 319.78

So using .2g will give you 320 FPS.

Obviously not taking into account any other factors.

[The Keeper of Secrets]

Re: FPS Formular

Force = Mass/2 x Velocity squared

Where Force = Joules, Mass = Kg, Velocity = M/S

Convert fps to ms then stick in your numbers.

If your using .28 bbs and it is shooting at 270 fps:

270 fps = 82.3 ms
(0.00028/2) x (82.3*82.3)
0.00014 x 6773.29 = 0.95 Joules

Rearranging the equation using a bb weight of .2g will give you:

0.95J = (0.0002/2) x (MS squared)
MS squared = 0.95 / 0.0001
MS squared = 9500
MS = 97.47
FPS = 319.78

So using .2g will give you 320 FPS.

Obviously not taking into account any other factors.

I take it by 'Force' you mean 'Energy'. Force is in Newtons.

[Rommel]

Re: FPS Formular

Yep, thats the one.

[sniper34d]

Re: FPS Formular

Thanks guys. Great help