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chamber volume

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 volume

Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 6:33 am

would a chamber volume double the volume of the barrel be good or do i need more?
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 26, 2007 6:36 am

It should suffice for a large-ish calibre project, what pressures are you planning on running at and what's your barrel diameter?
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pipe diametre

Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 6:44 am

i am going to use 1" abs for the barrel and chambers tbarrel will be 1m long and chambers also 1m long
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 26, 2007 6:47 am

That will give you good power given a good enough valve, one problem though is the use of ABS for the chambers. It's fine for the barrel, but unless you're going to stick to pressures below 50 psi it's highly recommended you go for pressure rated PVC.
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Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 7:42 am

jackssmirkingrevenge wrote:That will give you good power given a good enough valve, one problem though is the use of ABS for the chambers. It's fine for the barrel, but unless you're going to stick to pressures below 50 psi it's highly recommended you go for pressure rated PVC.

the abs is pressure rated to 9 bars which is about 130psi i think
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 26, 2007 7:45 am

132.3 psi if we're going to be pedantic :D hehe but as long as it's pressure rated, go for it ;)
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Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 7:48 am

jackssmirkingrevenge wrote:132.3 psi if we're going to be pedantic :D hehe but as long as it's pressure rated, go for it ;)

it was just an estimate i couldn't remeber the exact figure from the website i am planning to buy the pipe from
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Unread postAuthor: DYI » Sun Aug 26, 2007 9:54 am

Pressure rated ABS is one of the best spudgun materials there is. Congratulations on finding a place to get it.

You will need a fast valve with such a short barrel though.
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 26, 2007 9:56 am

DYI wrote:You will need a fast valve with such a short barrel though.


A modded 1" sprinkler valve will suffice.
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Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 11:59 am

jackssmirkingrevenge wrote:
DYI wrote:You will need a fast valve with such a short barrel though.


A modded 1" sprinkler valve will suffice.
will an un-modded one work because i want a electronic safety.
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Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 12:00 pm

DYI wrote:Pressure rated ABS is one of the best spudgun materials there is. Congratulations on finding a place to get it.

You will need a fast valve with such a short barrel though.

what length would you recommend for an unmodded 1" sprinkler valve.
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Unread postAuthor: DYI » Sun Aug 26, 2007 12:04 pm

Well, if it is practical, and you are running it at normal pressures, I would extend the barrel until it has about 4x the volume of the chamber, to make the most of the available power.
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Unread postAuthor: boilingleadbath » Sun Aug 26, 2007 12:51 pm

Download the <a href="http://www.thehalls-in-bfe.com/GGDT/main.html">GGDT</a>.

Read the user's manual.

Use the GGDT.

...decide for yourself.
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ggdt

Unread postAuthor: ALIHISGREAT » Sun Aug 26, 2007 1:02 pm

yes but i don't want to use up disk space.
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Unread postAuthor: DYI » Sun Aug 26, 2007 1:48 pm

The entire thing is only 1.86 MB. That's hardly anything.
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