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BBMG operating pressure?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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BBMG operating pressure?

Unread postAuthor: spudnutbutthut » Fri Oct 16, 2009 8:56 pm

I want to make a 3/4in cap bbmg. I want to run it with propane that expands in a 4inch 3 ft tank. Id be firing at around 60 psi at max, and 90 if i let it sit for a LONG time. Is 50-60 enough to fire bbs with substantial force? I will have a 450 mm barrel.
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Unread postAuthor: spudnutbutthut » Sat Oct 17, 2009 1:52 pm

Does no one know? What pressure do you operate YOUR cap bbmg at?
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Unread postAuthor: cannon monkey » Sat Oct 17, 2009 1:57 pm

i guess not i would say 60-75 psi?
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Re: BBMG operating pressure?

Unread postAuthor: Ragnarok » Sat Oct 17, 2009 3:17 pm

spudnutbutthut wrote:Is 50-60 enough to fire bbs with substantial force?

You'll need to give a numerical measure for "substantial force", because "substantial force" is very subjective. What I consider to be substantial force is unlikely to be the same as you consider to be substantial force.

And let's not even get started the definition of "substantial force" some of our more... radical members would use. Suffice to say, it probably has a two block safe distance.
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Re: BBMG operating pressure?

Unread postAuthor: jimmy101 » Sat Oct 17, 2009 4:31 pm

I suspect that even with an input pressure of 60 PSI the gun will actually be running at less than 20 PSI.

With a 120 PSI compressor most BBMGs have chamber pressures of less than 20 PSI.
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Re: BBMG operating pressure?

Unread postAuthor: jackssmirkingrevenge » Sat Oct 17, 2009 6:12 pm

jimmy101 wrote:I suspect that even with an input pressure of 60 PSI the gun will actually be running at less than 20 PSI.

With a 120 PSI compressor most BBMGs have chamber pressures of less than 20 PSI.


One could always follow the man's advice to boost that easily.

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... or put the BBs in your chamber and behind the valve like I did here:

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Unread postAuthor: irisher » Sat Oct 17, 2009 8:14 pm

I would not recommend using propane. The odor additive will linger and you will be standing in a cloud of flammable gases. Btw I run my vortex cap at ~200 psi.
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Unread postAuthor: spudnutbutthut » Sat Oct 17, 2009 11:27 pm

Im thinking id be using .12 or .2 grams, itd have to be around 350fps and fire around 80 ft?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 18, 2009 12:51 am

spudnutbutthut wrote:Im thinking id be using .12 or .2 grams, itd have to be around 350fps and fire around 80 ft?


It shouldn't be a problem, with 0.12g BBs and 80-90 psi in this ghetto device I was getting this sort of performance:

[youtube]http://www.youtube.com/watch?v=IgX0A3XM2N0[/youtube]
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Unread postAuthor: Marffy » Fri Nov 06, 2009 9:23 am

50-60 will do but i run mine all the way to 150
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Unread postAuthor: Brian the brain » Fri Nov 06, 2009 5:22 pm

900 psi.
Okay..not a cap vortex..just modded elbow vortex thingy
later turned into regular cloud design..

But I sold it...

So I'm just bragging.. :D
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jimmy101 » Sun Nov 08, 2009 11:27 am

Another reason not to use propane in a bbmg, at least if you are using copper/steel BBs and not airsoft.

BBs will throw sparks when they hit things. Concrete at short range will spark. I wouldn't be surprised if there wasn't' an occasional spark from a steel barrel.

Be very bad if the occasional BB threw a spark after a couple mnutes of firing in calm air.
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