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Chamber Size

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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Chamber Size

Unread postAuthor: Thursto » Sat Oct 18, 2008 5:35 am

Hey guys,

i know i havent been around in a long time, i've just been so busy.

I've finaly decided to add those finishing touches to my marble gun.

Now my barrel is curently copper sleeved in 3/4" PVC and fits marbles perfect, but its 90cm Long.

My chamber is 2" Pressure PVC (its an under over config, ill dig up a link with a pic later) and its 30cm long.

I want to shorter the barrel and get more power but keep accuracy.

More power = Bigger air chamer (Cant exceed 120PSI)
Accuracy = Longer barrel (Ill have to sacrafice accuracy)

So what im asking is, what would you do if you wanted it to be more close combat like?

Ill edit a link in soon.
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Last edited by Thursto on Sat Oct 18, 2008 5:52 am, edited 1 time in total.
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Unread postAuthor: psycix » Sat Oct 18, 2008 5:43 am

A longer barrel does not mean accuracy.
Its the quality of the barrel and consistency of the shots that makes the accuracy.
If you want more power, use a metal chamber and more pressure.
What kind of valve are you using?

When decreasing barrel length, increasing chamber volume to make up for the power loss is not very efficient.
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Unread postAuthor: Thursto » Sat Oct 18, 2008 5:47 am

Hey,

I cant upgrade to metal, it will remain Pressure PVC.

Im using a sprinkler valve, actuated by a blow gun.

I'd say my barel is excellent, marbles fit with about 1mm gap.

Ok pics are up.

I Think im going to keep the chamber the same size but maybe decrease barrel length to... hmmm lets say 50-60cm

what do you all think?




Btw this is jst a rebuild. I'm attaching a new scope, going to go for the open holographic red dot sight, a gun sling, proper spring loaded bipod and a paint job.
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Unread postAuthor: psycix » Sun Oct 19, 2008 10:03 am

Ah the pics...
The paint would certainly look better in combination with that scope.
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