How to Calculate FPE in Air Guns
Posted: Wed Jun 29, 2011 11:53 am
Hi Guys,
> Here's some more Gyan!
How to Calculate the Power of Your Air-gun
>When it comes to air-guns, many people regard it as a TOY. However, the air-gun is a very viable tool for hunting and pest control. And one of the things that concern most the air-gunner is the power available from their air-gun.
>There is a simple mathematical equation that you can use to determine the power that your air-gun develops. Here is the equation:
>Mass (wt of the pellet in grains) X velocity (in feet-per-second) squared, divided by 450240 (gravitational constant)
>Now what does that mean? Simply put, you multiply the square of the velocity of your pellet, with the weight of your pellet. Then divide by 450240, and you have your FPE (foot pounds energy).
>Example:
• Velocity of your pellet say is 750fps
• Weight of the pellet say is 14.5gr
• Then FPE = 750 x 750 x 14.5 divided by 450240 = 18fpe
>You need a chronograph in order to determine the accurate speed of your pellet. Many air-guns are tested with the lightest ammo available, and the advertising will state the speed as an impressive marketing tool.
>Don’t be taken-up with these claims. Experienced and knowledgeable GURUS often state that “Don’t go for power” – but go for accuracy.
>0.177 cal pellets have always an edge over 0.22 cal pellets due the lightness in the weight of their pellets – while 0.22 cal pellets due to their comparatively heavier pellet weight travel slower than 0.177 cal pellets. Nevertheless, the FPE is always higher in 0.22 cal pellets.
>The ideal fps for 0.177 cal for good accuracy is between 750 & 800, while for 0.22 cal it is between 650 & 700. These form an ideal combination of velocity & power.
>Believe it or not there is something called ‘Natural Frequency’ that exist both in animate & in-animate objects. So look after your gun – fondle it, caress it and look after it – you’ll be surprised how it will perform – Happy Shooting!
Cheers
Brihacharan
> Here's some more Gyan!
How to Calculate the Power of Your Air-gun
>When it comes to air-guns, many people regard it as a TOY. However, the air-gun is a very viable tool for hunting and pest control. And one of the things that concern most the air-gunner is the power available from their air-gun.
>There is a simple mathematical equation that you can use to determine the power that your air-gun develops. Here is the equation:
>Mass (wt of the pellet in grains) X velocity (in feet-per-second) squared, divided by 450240 (gravitational constant)
>Now what does that mean? Simply put, you multiply the square of the velocity of your pellet, with the weight of your pellet. Then divide by 450240, and you have your FPE (foot pounds energy).
>Example:
• Velocity of your pellet say is 750fps
• Weight of the pellet say is 14.5gr
• Then FPE = 750 x 750 x 14.5 divided by 450240 = 18fpe
>You need a chronograph in order to determine the accurate speed of your pellet. Many air-guns are tested with the lightest ammo available, and the advertising will state the speed as an impressive marketing tool.
>Don’t be taken-up with these claims. Experienced and knowledgeable GURUS often state that “Don’t go for power” – but go for accuracy.
>0.177 cal pellets have always an edge over 0.22 cal pellets due the lightness in the weight of their pellets – while 0.22 cal pellets due to their comparatively heavier pellet weight travel slower than 0.177 cal pellets. Nevertheless, the FPE is always higher in 0.22 cal pellets.
>The ideal fps for 0.177 cal for good accuracy is between 750 & 800, while for 0.22 cal it is between 650 & 700. These form an ideal combination of velocity & power.
>Believe it or not there is something called ‘Natural Frequency’ that exist both in animate & in-animate objects. So look after your gun – fondle it, caress it and look after it – you’ll be surprised how it will perform – Happy Shooting!
Cheers
Brihacharan
