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> Muzzle Velocity And Bb Weight, The science behind .20 and .25 revealed.
Guest_BattlePriest_*
post Mar 4 2005, 01:58 AM
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The following is an article at Airsoft Retreat regarding the science of BB weight (relating to .20 and .25 gram BBs) and its effect on range and accuracy.

I was very surprised. I had to rethink my own BB weight choices in certain game situations after reading this. Its VERY scientific and mathematical in nature, so if that kind of stuff confuses or doesn't interest you, you may want to just scroll down to the bottom for the results.

This article takes into account a couple of things that the Article/calculator at Arnies doesnt, this is new stuff baby.

http://www.airsoftretreat.com/features/articles/fpsweight/

Please do not re-post the text of this article anywhere.. it is the property of Airsoft Retreat and the author.
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TheViperPit
post Mar 11 2006, 03:10 AM
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Great write up, thanks for the link.
Only thing I would have like to have seen is .23 BBs added into the equations.
I wonder if they "provide the best of both worlds" or if they would recommend sticking with either .20 or .25 based on your situation.

This post has been edited by TheViperPit: Mar 11 2006, 03:10 AM
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KageOokami
post Mar 11 2006, 03:27 AM
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Thank you BP for that vitalizing bit of information. Not sure what else to say but, I think I feel more better about using .25's, they're worth every bit of my money. I do agree TheViperPit, I'd like to see one done on .23's, although, I've never used them personally.


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rentien
post May 8 2006, 08:34 AM
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so is the moral of the story "use 0.25g with an AEG since its range would be more, and use 0.20 with a pistol since a pistol is used for cqb (kinda)"
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~MoD~
post May 13 2006, 09:49 PM
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QUOTE (rentien @ May 8 2006, 06:34 AM) *
so is the moral of the story "use 0.25g with an AEG since its range would be more, and use 0.20 with a pistol since a pistol is used for cqb (kinda)"


Hehe, you just did exactly what BP said not to =P

That is a great document. It shows me that I need to be using .20's because we play in an indoor CQB. There are no shots longer than 60 feet or so.


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rentien
post May 14 2006, 04:26 AM
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QUOTE (~MoD~ @ May 13 2006, 07:49 PM) *
Hehe, you just did exactly what BP said not to =P

That is a great document. It shows me that I need to be using .20's because we play in an indoor CQB. There are no shots longer than 60 feet or so.


how did I do exactly what BP said not to?
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Alpha Elite
post May 17 2006, 08:36 PM
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Woah I looked at the graph and it was confusing...


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~MoD~
post May 22 2006, 10:57 PM
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QUOTE (rentien @ May 14 2006, 02:26 AM) *
how did I do exactly what BP said not to?

QUOTE (BattlePriest @ Mar 3 2005, 11:58 PM) *
Please do not re-post the text of this article anywhere.. it is the property of Airsoft Retreat and the author.

QUOTE (rentien @ May 8 2006, 06:34 AM) *
"use 0.25g with an AEG since its range would be more, and use 0.20 with a pistol since a pistol is used for cqb (kinda)"

You quoted the article. That's what I meant.
However, I do not believe that this argument is constructive to the topic at hand; Which is to help you choose what weight of bbs to use.


The only problem I have with this article is that it assumes that a projectile weighing .20 grams absorbs the same amount of energy as a projectile of the same size weighing .25 grams.

Consider this. You can throw a bb at roughly 90 mph. You can also throw a baseball at roughly 80 mph.
A baseball weighs much more than a bb. And it is in your hand longer. It has more time to absorb energy. A bb is very light in comparison and has less time to absorb energy.
My point is that there is a limit to how fast you can move your arm; and it is vurtually the same speed as you can throw a bb. But a baseball is heavy enough that it actually slows down your arm. So it absorbs much more energy.

Of course, there is a huge difference in weight from a bb to a baseball. But the same should apply to 2 bbs of the same size but different mass, just to a lesser extent.

How fast does a spring move (one that fires at 85m/s) when dry-fired? How much slower does it move when loaded with a .20g bb? How much slower still does it move when loaded with a .25g bb? If you fired 2 bbs at 1 time would it half the fps?

These are important questions to consider as they can greatly alter the calculations.

This post has been edited by ~MoD~: May 22 2006, 11:17 PM


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Guest_TriChrome_*
post May 23 2006, 09:59 AM
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Real world tests have already been done with .2 and .25 gram BB's (not just physics equations and many charts like this artical has, and no real-world tests). I would check out this link to the test: http://www.arniesairsoft.co.uk/forums/inde...opic=38192&st=0

What he found out, with real-world tests is at range the heavier BB is traveling faster than the lighter BB (and gets to target faster), which proves the outcome of the Airsoft Retreat article.
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theothercolin
post Jun 6 2006, 05:47 AM
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This is some interesting stuff here. At the very least makes you think, and I can definately see an application for this in game use and other times, very helpful.


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captain_sniper
post Jun 9 2006, 02:20 AM
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QUOTE (~MoD~ @ May 22 2006, 08:57 PM) *
If you fired 2 bbs at 1 time would it half the fps?


I have a chronograph. I am going to try that...

I'll try to post here soon.


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TEN36VX
post Sep 29 2006, 02:47 AM
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QUOTE (TriChrome @ May 23 2006, 10:59 AM) *
Real world tests have already been done with .2 and .25 gram BB's (not just physics equations and many charts like this artical has, and no real-world tests).
The science is the foundation, which is proved by 'real world' tests


QUOTE (TriChrome @ May 23 2006, 10:59 AM) *
What he found out, with real-world tests is at range the heavier BB is traveling faster than the lighter BB (and gets to target faster), which proves the outcome of the Airsoft Retreat article.
Yes, and...
The lighter BB has a higher FPS at muzzle since its lighter weight means that energy from the propelent (compressed air) can move it faster. However, the lighter BB will burn off it's energy quicker whereas the heavier BB may start off slower but retains it's energy far longer (eg. longer range). I thought that was all explained in the article....

This post has been edited by TEN36VX: Sep 29 2006, 02:55 AM


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DM Hackle
post Mar 15 2008, 08:51 PM
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Thats great to know I have always been a fan of 25s but now I am really a fan
I have one thing to add tho having adjustable hop up can affect your decision on what bbs to buy


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airsoftsniperm4
post Mar 24 2008, 07:03 PM
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Does anybody know where I can find some Airsoft Elite .28 gram bb's? With my KWA M4A1 (not CQB), would it be better to use .25's rather than .28's?


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Lite Fighter
post May 31 2008, 05:09 PM
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think of it this way trying to stop a honda civic vs. a semi. there is much more effort that is needed to slow down the truck than the car. the truck has much more momentum than that of the car which will allow it to travel much greater distances.
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TAMU_John
post May 31 2008, 06:03 PM
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For those that don't have or want to mess with making new forum accounts:
This chart has higher velocities than what I saw in the article after a quick skim, the chart is on the Texas AirSoft Organization website under rules.


Match the JOULE readings and you can easily get an idea of how BB mass affects muzzle velocity.
The "flow" of the chart is diagonal, like the colored boxes show.
Ex: 400 FPS w/ .20's is about 375 FPS with .25's

This post has been edited by TAMU_John: May 31 2008, 06:05 PM


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Spyder93090
post Apr 26 2011, 02:59 PM
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Sorry if this has been addressed before but the link doesn't seem to work.
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ConConMcBadBad
post Jun 17 2011, 02:11 PM
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I did a calculation and judging by this chart almost exactly the same amount of energy is absorbed no matter what BB. Just do a BB weight/joules ratio and find out.


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