FPS

[ThunderCactus]

Not just that, but especially in gas guns, joule creep is caused by the fact a heavier BB takes longer to accelerate, therefore is in the barrel longer, and therefore continues to accelerate as the gas keeps driving it forward.
With a GBBR you are releasing significantly more volume of gas per shot than with an AEG. Although rare, joule creep does happen on AEG's as well.
That's why we tell everyone to chrono with the weight of ammo they will be using in game, and simply convert their measured FPS and BB weight to muzzle energy.
As opposed to the old system, where everyone chrono's with .20s and we just ASSUME the joule curve is linear.

To give you a real world example;
My WE PDW shot 380fps when chrono'd with .20s, that's 1.34j
But on .28s, it shot 345fps, which is actually 1.54j
We had a field limit of 1.48j at the time, so you see how this could be a major problem.


And as for the original poster's question;
I use a systema PTW, it is an AEG on steroids and uses proprietary 120rnd mags.
I only carry 9 of said mags, and only ever fill them 50-60 rounds each.
I use semi only, because it's inherently more accurate, conserves more ammo, and is less likely to give away your position through noise and a steady line of BBs
Those 9 mags usually last me two 'deathmatch' scrims, around 30-45min each
I still get plenty of kills

Unfortunately, not everyone has an accurate laser rifle, many people, especially new people, with AEG's DO tend to favor full auto.
But that's part of the game, and you need to adapt your strategy to counter that.
You don't get good by handicapping other players, you only get better handicapping yourself!

[Rossco66]

That I can believe. I'm no physics major obviously but I would have thought that the energy put out by an AEG would be the constant. If the energy output remains constant an object with less mass should be propelled with more velocity than one with higher mass. The reduction in velocity resulting from the increased amount of energy consumed to overcome the extra weight to start the object moving in the first place. The heavier object will have its own inertia which should be more than the lighter unit due to the additional mass and that is why it hits harder.

Oh hell where are Bill Nye the Science guy and the Mythbusters when you need them.

[chaz]

All I know is that I am getting a chrono now

[ThunderCactus]

Think about it carefully, muzzle energy isn't a variable, but a solution to an equation.
Muzzle energy is a product of a specific volume of compressed air pushing a spheroid of a given weight down a length of tube. You can directly alter any of those variables, but you can't make the gun lower it's muzzle energy without changing any of those variables.

This is an area that crosses over into firearm physics.
The simplest way to increase the muzzle velocity of a bullet, is to make the barrel longer. The bullet spends more time under pressure from expanding gasses, and therefore leaves the barrel faster.
Compare the MC51 to a G3A3, the MC51 has 800J less muzzle energy due to the shorter barrel.

[D2D]

Originally Posted by ThunderCactus

9 mags

Ugh, I'm really regretting not getting an AEG right about now... I only have two mags and am only planning on getting another two, for now at least. I guess I'll need to carry a reloader and propane tank with me, lol

[ThunderCactus]

Don't feel too bad, my mags are also $60 each
Difference is, mine are just glorified AEG mags, they probably only cost $6 to produce lol

Not to be bias, but polarstar users, and those with AEG's that favor high rates of fire, tend to carry more ammo (since they never learned how to aim). Not uncommon to see the odd guy carrying 16 midcaps.
Still only takes 1 BB to take them out, so don't feel outmatched lol

[cav.]

This thread was quite a good read. So how would this apply to fields that test your guns with .20g but you want to use .25g? I'd assume it would be best to adjust NPAS so the .25g would chrono at 320ish?

[lurkingknight]

joule creep is definitely something people should be aware of.

400 fps with a .2 is roughly 1.48J... And with Xcortechs being able to work out the J rating if you properly set the BB weight, there shouldn't be any excuses not to be chronoing the provided .2s and the ammo you wish to run in the gun for the game.

Hell, one of the vendors in the states I order from sent me a bunch of business cards with a basic J conversion chart on it much like the one chaz pointed out.

You won't see much creep on an AEG.. maybe .1 or .2 of a J but you'll see massive swings on anything with expanding gas powered, gbbr, pistols, polar stars and daytona guns.

[ThunderCactus]

instead of messing with the settings on the xcortech, I just write the joule limit converted to fps of the most common weights of ammo on the top of the chrono. And I suggest everyone else do that too!