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Help with my Pnuematic cannon

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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Help with my Pnuematic cannon

Unread postAuthor: SCrid2000 » Tue Aug 08, 2006 5:03 pm

Hey guys, I'm fairly new at this. I built a launcher with a 1 foot long 3inch chamber, a 3/4inch ball valve, and a 1foot long 2 inch barrel. I can only get about 100-150 feet with this at 120 psi.
Does this sound about right?
Would switching to a sprinkler valve increase that distance much?
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Re: Help with my Pnuematic cannon

Unread postAuthor: zvallance1 » Tue Aug 08, 2006 5:31 pm

1. the valve is choking the flow, A LOT, so a modded 1" sprinkler valve would def do the trick to get a 100+ yards

2. a 2" barrel is pretty large...go down to a 1 or 1.5" barrel and with the modded valve, your distance's will be EASILY doubled, even tripled
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Unread postAuthor: MrCrowley » Tue Aug 08, 2006 11:21 pm

if you change your barrel to be 3 or 4 feet and chamber 2 or 3 feet and with the upgrades in the previous post you should easily get 120 yards.
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Unread postAuthor: BC Pneumatics » Wed Aug 09, 2006 3:05 am

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Unread postAuthor: MrCrowley » Wed Aug 09, 2006 4:45 am

And if you wanna build a barrel sealing piston valve this is a video by BC himself on how to make one.

Video:http://www.bcvids.com/dload.php?action=file&file_id=4

Animation:http://forums.spudtech.com/topic.asp?TOPIC_ID=13265&whichpage=1

P.S BC, Im not trying to make him build a piston valve instead of buying a sprinkler valve of you, Im just helping him out. :D

edit:spelling :oops:
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Unread postAuthor: mdangle » Thu Aug 10, 2006 10:17 am

Longer barrel= 10.00
Sprinkle valve=20.00
+150yrs=Priceless
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Unread postAuthor: SCrid2000 » Thu Aug 10, 2006 11:30 am

Cool, thanks a lot guys.
I'm going by home depot today to build a launcher for tennis balls.
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Unread postAuthor: BC Pneumatics » Thu Aug 10, 2006 12:32 pm

mdangle wrote:Longer barrel= 10.00
Sprinkle valve=20.00
+150yrs=Priceless


How does pipe and valving make you live longer?

;)
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