Physics...

[Airsoft-Ed]

I was talking to my mate just now about a game we went to recently and we got onto a debate about fps.

Lets say for arguments sake, a gun shoots at 500 fps using .20g BBs. If I were a sniper I wouldn't want to use .20g BBs, I'd probably use something like a .36, or for the sake of easier maths, let's say a .40.

Surely, if you double the BB weight, it ought to half the fps? So a .40g BB fired from the same gun, should leave the muzzle at 250fps or there abouts.

But, the AF-UK app says it'll be doing 350ish fps.

How does that work?

 

[Deva]

This is when I'm going to wish I had commented my code. It's basically the kinetic equations for motion and energy etc. It is definitely right

I'm pretty sure it is because f=m/a and if you have more mass, you have a higher force, so you have more energy hence a *higher* FPS than just halving.

 

[Airsoft-Ed]

Makes sense I guess.

It did seem weird to think that a high power sniper would be shooting slower than a regular pistol when using heavy ammo.

 

[M_P]

Also a 0.4g bb at 350 fps still has almost double the kinetic energy of a 0.2g at 500fps so despite the mass, itll still go surprisingly fast (wont put figures as its not interesting )

 

[joshcowin]

The thing i do know is that a 0.40g hurts more than a 0.20g shooting at 500fps