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sniper34d
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Join Date:
Oct 2009
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#1
FPS Formular
30 June, 2010, 22:07
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
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#2
30 June, 2010, 22:10
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.
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psirus101
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#3
30 June, 2010, 22:17
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
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Kingwell
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#4
30 June, 2010, 22:21
Re: FPS Formular
it will never work out accurately... air displacement, barrel length, barrel diameter all come into play..
Systema PTW M4A1 - TM M14 - KSC Glock 17 - WE 1911 MEU - TM Hi Capa race gat
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Abbadon101
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#5
30 June, 2010, 22:25
Re: FPS Formular
Yes but you should be able to tell if you will be alot under or over.
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cracking day
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#6
1 July, 2010, 00:01
Re: FPS Formular
319 fps with a .2
286 fos with a .25
There is an iphone app for that.
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mgaraveb
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#7
1 July, 2010, 01:39
Re: FPS Formular
Originally posted by
cracking day
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319 fps with a .2
286 fos with a .25
There is an iphone app for that.
What's it called
why so serious
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HuntR
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#8
1 July, 2010, 01:46
Re: FPS Formular
it's £0.59 just type in airsoft and it comes up
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mgaraveb
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#9
1 July, 2010, 02:01
Re: FPS Formular
Got it
why so serious
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Wingmann
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#10
1 July, 2010, 08:44
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.
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Rommel
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#11
1 July, 2010, 13:39
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.
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The Keeper of Secrets
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#12
1 July, 2010, 13:42
Re: FPS Formular
Originally posted by
Rommel
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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.
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Rommel
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#13
1 July, 2010, 13:53
Re: FPS Formular
Yep, thats the one.
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sniper34d
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#14
1 July, 2010, 13:59
Re: FPS Formular
Thanks guys. Great help
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