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April 30th, 2014, 22:18 | #1 |
FPS
Hi there. I bought a rifle a very long time ago and am just now looking into going out and playing; I have a question about FPS limits.
In an outdoor field with full gear, would you notice one or two hits from ~400 FPS (.2g BB) and call yourself out? I ask because I have a gas gun with a few 30-round magazines, and I'm assuming (incorrectly?) that AEG players in general play on full-auto. I, on the other hand, need to be very conservative with my shots. Last edited by D2D; April 30th, 2014 at 22:22.. |
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April 30th, 2014, 22:21 | #2 |
very incorrect. Most people I play with run semi and run mid caps.
You will notice the hit depending on where it is and how close you are. If you are shooting 400fps why not put in a better bucking and some heavier BB's? That will get you better shots with a little more umph on the receiving end. My 2 cents anyway.. No change please |
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April 30th, 2014, 22:25 | #3 |
Ah, you misunderstood. I wouldn't be shooting .2g BBs - I was just using that as a reference point. I would be using .25g or heavier.
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April 30th, 2014, 22:30 | #4 |
Unless you are running or are 150 feet away, you will feel it if you are wearing any type of normal clothing. If you are sporting a ghillie suit you may not feel it. A direct hit from 100 feet on an arm with just a level of BDU cloth in between your skin and the BB will leave a welt.
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April 30th, 2014, 22:40 | #5 |
2 Cent Tactical
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If he is already shooting 400FPS with 0.2g (1.5J) on a gas gun, using heavier BBs will place him FAR over the 1.5J limit.
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April 30th, 2014, 23:06 | #6 |
April 30th, 2014, 23:10 | #7 |
FPS is velocity where Joules are kinetic energy.
Increase the weight of the BB and the Kinetic Energy increases. |
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April 30th, 2014, 23:15 | #8 | |
FPS
Quote:
I guess he's referring to what's commonly known as "power creep", where a heavier BB will result in slower initial speed, and longer delay before the BB exits the barrel This result in a bugger gas build up behind the BB and translates to an increase in energy. Technically, if at 1.48J with .2, a gas gun will effectively have an higher energy output with heavier BBs; I wouldn't think that increase would be *that* high though; I'm sure there are charts around the web that people put up after actual tests Edit: Chaz, not exactly Velocity and energy are tightly related; increasing weight doesn't increase kinetic energy, as the velocity also decrease |
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April 30th, 2014, 23:16 | #9 |
Found one!
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April 30th, 2014, 23:25 | #10 |
More discussion on this here
http://www.airsoftsociety.com/forums...73/index2.html Actually, tons everywhere if you google :P |
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April 30th, 2014, 23:27 | #11 | |||
2 Cent Tactical
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Quote:
Gas behind a heavier BB has more time to expand and exert its force onto the BB, this in turn give it more energy than it would receive had this been done in an AEG. Quote:
Quote:
This method is being followed for Nightfall this year. Yes, it is that high. There is a significant increase as seen above.
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Last edited by Cobrajr122; April 30th, 2014 at 23:33.. |
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April 30th, 2014, 23:39 | #12 | |
Quote:
Check out the picture I posted, it puts Joules against FPS |
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April 30th, 2014, 23:42 | #13 |
Good to know. A lot of moving parts. I would have thought the energy output would have been stable and the heavier BB therefore resulted in less velocity.
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April 30th, 2014, 23:44 | #14 |
Less velocity but higher impact.
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April 30th, 2014, 23:53 | #15 |
2 Cent Tactical
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Not only is the energy higher at the muzzle, heavier BBs hold onto that energy for longer, and transfers more of that energy to a surface it collides with.
So a 0.2g shot @ 1.5J will contain less energy at 100 feet then a 0.25 that was shot @ 1.5J will. http://msed.bbbastard.com/ATP/01-c-01.htm
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