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Best Design, A or B?

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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Best Design, A or B?

Unread postAuthor: jd120655 » Thu Mar 07, 2013 5:45 pm

So i have built a combustion cannon and a few pneumatic cannons before all have been in the style of Design A. My question, are there any advantages to using the U-shape like in design B? Which provides better performance?

Which is the best for a pneumatic cannon using a sprinkler valve? A or B?

Design A
Image

Design B
Image
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Unread postAuthor: PaperNinja » Thu Mar 07, 2013 5:53 pm

Ball valves (design A) have a very slow opening time, and in general are going to be inferior to basically any other valve (QEV, hammer, piston, diaphram etc)
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Unread postAuthor: jd120655 » Thu Mar 07, 2013 5:58 pm

i'm not using a ball valve, replace the ball valve with a sprinkler valve. It was just an example to demonstrate the different shapes.

The question is whether having the u-shape adds anything or takes away anthing. or if its jsut for looks
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Unread postAuthor: PaperNinja » Thu Mar 07, 2013 6:10 pm

Oh. I believe any bend will add turbulence=decrease flow, so A might have slightly better performance, but I don't think it's much of an issue.
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Unread postAuthor: jd120655 » Thu Mar 07, 2013 6:14 pm

ok that's what i thought. Thank you!
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Unread postAuthor: dewey-1 » Thu Mar 07, 2013 7:25 pm

Here is a better diagram for you to ponder!
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Unread postAuthor: jd120655 » Thu Mar 07, 2013 9:00 pm

where do you make these fancy pictures? lol.

i think i'm going inline 2' 4" pvc chamber down to 1" for the valve then back to 2" then from there have a female adapter for interchangeable barrels. if there's a place where i can make these images it would help a lot
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 08, 2013 1:31 am

jd120655 wrote:if there's a place where i can make these images it would help a lot


he just cut and paste the diagram you originally posted ;)

Also: http://www.spudfiles.com/forums/modding ... -t305.html
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Unread postAuthor: dewey-1 » Fri Mar 08, 2013 10:27 am

Here is 4"x18" Chamber and 2"x36" Barrel for Nerf Pocket Vortex launcher.
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Unread postAuthor: mattyzip77 » Sat Mar 09, 2013 7:37 am

Dewey you still make the best sketches!!!!!!
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Unread postAuthor: jd120655 » Sat Mar 09, 2013 3:00 pm

after some more research i'm definitely modding my sprinkler valve.. i'm hoping to get started on the whole thing today
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