In simple terms, joule
In simple terms, joule creep causes your gun to fire with more force when you load heavier ammo. No other changes are necessary.
So it's important to be aware of it, as if you chrono safe for your field on one weight, and then switch to a heavier one to play, you could put yourself over your field limit by a pretty substantial amount and cause someone serious harm.
Airsoft is a game based on skill and honesty, it's not about causing people pain, so make sure you obey your field/site's power restrictions.
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great vid, i use an aeg but its good to know more about the sport
very nicely explained
Thank you! Now they will not say I'm a liar!!
So, sorry if I missed this in the video but, what would be the best way to combat this issue? I know you mentioned reducing the inner barrel length but are there any other ways, and if not how might I find how short I should cut the inner barrel or would I have to resort to guess and check working my way down?
Edit: Specifically for a gas gun I mean.
Is there a 1J limit in the uk like in ireland aswell?
Garrett brings out the
Garrett brings out the white board once again to demonstrate the phenomenon that is Joule Creep!
Excellent Explanation. I sent the link to this video to several people I know and even posted it on my Facebook page. I think more fields need to start using Joules to chrono.
So if my scorpion evo can lift the 0.46 bb’s it would should further? Confusing but chrono is always with 0.20bb from field even bolt snipers and such.. using 0.28 right now at half hop or so
how did u calculate the jouls
That's why you need to wear protection.
Don't play if you don't want to get hit.
Cheaters will be cheaters. Even if you do it by joules if the players will not follow engagement distance somebody will still get hurt.
I am dividing to pick up a 2.8 joules spring or a 5 joules spring from novritsch.do the 5 joules spring harder to pull back the bolt or 2.8
This video was meant to
This video was meant to educate airsofters about joules and FPS, the differences between the two and joule creeping. It also explains why gas guns and HPA powered guns (such as polarstars) joule creep as well as the need to joule creep in DSG builds.
I realized I never covered how to measure joules while chronographing (although deductive reasoning will give you the answer). After chronographing someone's FPS with your standard round (normally 0.20g), chronographing the joules with their preferred (field) round will give you the amount of energy being passed through the BB. With this joule and a joule chart (or calculator), you can then convert over to FPS as needed.
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Mate.. energy is constant because this is how physics says. The amount of energy that goes into a system will have to leave the system, as is or transformed.
In this case the energy is the correlation between velocity and mass(probably there is a small amount of energy that bleeds out as heat... but let's keep it simple).
Theoretically a gun that shoots 400fps with .2g bbs will have aprox 1.5j. If you put 0.3g bbs in the same gun you will get around 328fps so the energy remains constant, at around 1.5j.
There are many problems with gas guns and HPA because :
- No one can control perfectly the amount of energy that goes into those systems. The gas regulators will let some gas to escape into the barrel in order to propel the bb but those are not very accurate systems.
- On top of that the propane for example will have probably 100psi at 40f and 145 at 90f.
- When you measure the speed of a gas or HPA system with 0.2 there is a big chance you'll get only part of the picture. You will certainly have a lot of unspent energy because that very light projectile will leave the barrel way too fast in order to capture everything. So you'll probably have 1.5j gun when you measure it with 0.2g and a 2.2J one when you measure with 0.4g bbs .
On the other hand an electric airsoft gun will have 60cc of air no matter what because the volume of the cylinder is fixed.
Great video Khang!
Very informative video. However, what you say at 3:11 is incorrect. The amount of energy in the BB is not constant throughout flight - In fact it varies more than FPS does throughout flight. Kinetic energy is defined at K=(1/2)(m)(V^2). So a 5% decrease in velocity actually results in a 10.25% decrease in kinetic energy.
Other than that point, great video!
Nice. Sharing this. Erik's polarstar at the start lulz.