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Relationship between range and fps

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Old November 19th, 2009, 03:09   #31
FOX_111
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Originally Posted by Dekan Frost View Post
Thanks Fox that makes perfect sense, but i'm a little unclear as to what you mean by the Hob, is the height of bore the distance between the barrel and the sight?

Also what do you mean by little to no wind? In the clip or the whine in the motor?
HoB is the distance between the bore and sight. At close range, your sight won't point to the point of impact, since they are set for longer range. Thus requiring you to aim with HoB distance in mind, or simply line your shot paintball style. Paintball style is quite imprecise though.

If you have wind when ajusting your hopup, it's harder to tell if you are ajusting correcly. Especially if you are shooting with the wind in front of you or in your back.

When ajusting, you want to see your BBs fly in a straight line. When you see them climb, you ajust a little so they don't and voila.
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Old November 19th, 2009, 03:37   #32
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Originally Posted by Amos View Post
Actually;

Heavy weight, high quality BB's + CONSISTENT Fps + FPS Matched hop-up rubber + Tight, consistent air seal = good range
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Originally Posted by Skladfin View Post
sorry guys, didn't care enough to put "BB" in the formula
I was going to post that the weight and quality of the BB is incredibly important. what would you rather be firing? .12 crossman BBs going haywire 2 inches out of your barrel because they are breaking the sound barrier, or some metaltech or BBbastard .25s going almost dead on upwards of 100 feet because they are going at a nice 320 - 330 FPS?

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ah so if actual measured cock size = 0 then range = 0. makes sense
so that is why girls don't play airsoft, it all makes sense now
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Old November 19th, 2009, 08:45   #33
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You can't set your hop up in less than 100ft distance. You need a LOT of distance to be able to set it. And you should check it before each game starts, and tweak it as needed. This is because air density varies from day to day, therefore your hop up effect will differ slightly from day to day. Obviously it's a bit of an exageration, but temperature has an effect, colder air is denser making you use a bit less hop up setting than on a really hot day.
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Old November 19th, 2009, 09:59   #34
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I was watching Myth Busters the other day and they did the golf ball car to see if it would reduces the drag on the car making the mile per gallon better and I thought.... Why don't we have BB's that are bumply like a golf ball yet.... They would travel with a lot more reduced drag on the bb.

Just a thought
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Old November 19th, 2009, 10:08   #35
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I was watching Myth Busters the other day and they did the golf ball car to see if it would reduces the drag on the car making the mile per gallon better and I thought.... Why don't we have BB's that are bumply like a golf ball yet.... They would travel with a lot more reduced drag on the bb.

Just a thought
Ive seen it suggested a few times, but not implemented yet.
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Old November 19th, 2009, 10:15   #36
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There are very small dimples on BBs anyways, I mean, if air molecules can fit into them........ Lol
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Old November 19th, 2009, 11:30   #37
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Dimples would just increase lift and reduce some drag. Lift may even be uncontrolable with dimples, and bbs would just up shoot all the time. It is the spin that mainly stabilizes flight, not the dimples.
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Old November 19th, 2009, 15:01   #38
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Originally Posted by Bissa View Post
I was going to post that the weight and quality of the BB is incredibly important. what would you rather be firing? .12 crossman BBs going haywire 2 inches out of your barrel because they are breaking the sound barrier, or some metaltech or BBbastard .25s going almost dead on upwards of 100 feet because they are going at a nice 320 - 330 FPS?
chilax man, all I did was just forgot to put two letters in and now you guys are flippin out.
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Old November 19th, 2009, 15:08   #39
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I was not freaking out, I was just making a good description of why BBs are a big factor in range and accuracy.
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Old November 19th, 2009, 16:44   #40
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if you have a gbbr m4 with 450 fps. If you use a .36g of bbs will it lower the fps into around 350fps?
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Old November 19th, 2009, 16:52   #41
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if you have a gbbr m4 with 450 fps. If you use a .36g of bbs will it lower the fps into around 350fps?
My experience with the WE AWSS M4 is that the fps will only lower by 10-30 fps from .20s to .30s.

The energy is very high on those. careful.

EDIT: Don't you dare use a 450fps GBBR with .36's indoors for CQB.
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Old November 19th, 2009, 16:57   #42
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if you have a gbbr m4 with 450 fps. If you use a .36g of bbs will it lower the fps into around 350fps?
If your rifle shoot 450fps on the chrony using 0.20g bb, and then you change to a .36g bb and chrony it again, you will notice a drop in fps. But the joules will be the same at the muzle. Your gun won't be field legal.

Set your rifle at 400fps using 0.20g then put whatever BB you want in it. (for outdoor use...)

In GBBR, heavyer BB will also give a little more fps, because of the gas expention, compared to a piston rifle, where the gas is unpressuried and just pushed by the silinder. So I'd chrony it again with the new ammo and check with a table convertion to verify that the joules output is still field legal.
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