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Pneumatic: 3/4or 1/2 inch?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Pneumatic: 3/4or 1/2 inch?

Unread postAuthor: The_Kangsta » Wed Jan 09, 2008 1:22 am

i was thinking of building a pneumatic gun with a small barrel. what would be better a 1/2 inch or 3/4 inch barrel? Please tell me the pros and cons.
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Unread postAuthor: jon_89 » Wed Jan 09, 2008 1:26 am

why not have both?personally i would go with half inch for marbles and batteries.
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 09, 2008 1:33 am

For the same length and assuming you're using a 3/4" valve, the larger barrel will have more power potential.
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Unread postAuthor: tansit234 » Wed Jan 09, 2008 2:56 am

1/2" is good for batteries and 3/4" steel is good for spent 12 gram Co2's. I'm not really a small bore expert but you should easily be able to use either one at long lengths with a high enough volume. If you do the C:B for the 3/4 then you'll only be wasting a little on the 1/2.
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Unread postAuthor: Atlantis » Wed Jan 09, 2008 11:12 am

The thing I love about 1/2" barrels is they fit Nerf Darts perfectly. Apparantly 3/4" CPVC fires paintballs. Just put a 3/4" thread on the exhaust, and make a 1/2" barrel with a 1/2" to 3/4: bushing to a 3/4" threaded fitting, so you can screw either on.
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Unread postAuthor: Model12 » Wed Jan 09, 2008 5:12 pm

My first and second guns were 1/2'' I love it, but my current gun is 3/4'' which shoots empty shotgun shells (fill them with water and freeze them) but I would do interchangeable barrels.
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Unread postAuthor: ALIHISGREAT » Wed Jan 09, 2008 5:38 pm

well i have a 3/4" barrel (uk pipe though not sure if that makes a difference) and its a perfect fit for 12g co2s then i have a barrel with an i.d. of ~18mm which is also fun to use, its just personal preference really, i suggest you check out this thread on ammo and see what you want to shoot the most and choose the barrel to suit.

http://www.spudfiles.com/forums/ammo-ideas-t1724.html
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Unread postAuthor: The_Kangsta » Fri Jan 11, 2008 5:07 pm

k thx for the info guys
I think i will go for the 1/2 inch barrel because it shoots marbles
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Unread postAuthor: OuchProgramme » Sat Jan 12, 2008 7:33 pm

Just have a reducing coupling for your body diameter to your barrel.
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Unread postAuthor: blindbatjosh121 » Sat Jan 12, 2008 8:21 pm

Yes like the others said your best bet is to make an adapter so you can use both barrels rather than just one
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