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10' Pneumatic Spudgun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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10' Pneumatic Spudgun

Unread postAuthor: Tidbit77 » Sun Dec 27, 2009 10:08 am

I built this cannon nearly a year ago and I just got around to posting it.

It has a chamber consisting of 10' of 4" PVC pipe and a 4" tee, giving it a total chamber Volume of approximately 1527.6 cubic inches.

It uses interchangeable barrels, either a 10' of 2.5" PVC or 10' of 1.5" PVC

The valve is a chamber sealing, sprinkler valve piloted piston valve from spudtech.

All of the pipe in the cannon is pressure rated PVC painted black (NOT ABS)
Heres a video of it firing, damage pic are in the vid.


[youtube]http://www.youtube.com/watch?v=aVyo9IeNmbk[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 27, 2009 10:12 am

Nice, I especially liked the barrelless paper shot :)

What pressure are you running at?
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Unread postAuthor: Tidbit77 » Sun Dec 27, 2009 10:34 am

I'm running between 100-120 psi, although I think the paper shot is at 50 psi...I don't quite remember.
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Unread postAuthor: psycix » Sun Dec 27, 2009 4:24 pm

Big...
Powerful...
Carnage...

Nice cannon!
Beautiful damage shots.

You've got quite some barrel flexing, but that's nearly unavoidable with 10' of 2,5".
Chamber volume is overkill-ish. You could use a larger diameter barrel for even more power.
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Unread postAuthor: Tidbit77 » Sun Dec 27, 2009 6:53 pm

To increase power I may just use a longer barrel (20' 1.5 or 15' 2.5") along with a barrel support system instead of a larger bore barrel. That way I could continue using the projectiles I use (arrows, tennis balls) and I could save some money.

Also, would it be feasible to connect two 10' sections of pipe (for the barrel) with a union, or would it be better to go with a cemented coupler?
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Unread postAuthor: McCoytheGreater » Sun Dec 27, 2009 7:01 pm

Your chamber and barrel are pretty much the same size as the big combustion style we're building. Of course, Pneumatics are more powerful and on average shoot about 33% farther than most average combustion guns. How many fps are you achieving, and how does it do on distance?
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Unread postAuthor: SpudBlaster15 » Sun Dec 27, 2009 7:25 pm

McCoytheGreater wrote:Of course, Pneumatics are more powerful and on average shoot about 33% farther than most average combustion guns.


How exactly did you come up with that number?
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Unread postAuthor: McCoytheGreater » Sun Dec 27, 2009 7:34 pm

Experimentation with our own combustion and pneumatic guns. Side by side tests. 5 shots from each gun at an angle of 35 degrees. 4.2% metered propane in the combustion gun, and 110 p.s.i. in the pneumatic gun. On average, our pneumatic gun shot potatoes about 33% farther than our combustion gun. Both chambers were roughly the same volume. There was nothing special about either gun. Sprinkler valve on the pneumatic, and a grill igniter on the combustion. Both had 2" barrels at 3' long.
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Unread postAuthor: Tidbit77 » Sun Dec 27, 2009 7:47 pm

GGDT predicts 796 fps for the arrow.
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Unread postAuthor: SpudBlaster15 » Sun Dec 27, 2009 8:12 pm

McCoytheGreater wrote:Experimentation with our own combustion and pneumatic guns. Side by side tests. 5 shots from each gun at an angle of 35 degrees. 4.2% metered propane in the combustion gun, and 110 p.s.i. in the pneumatic gun. On average, our pneumatic gun shot potatoes about 33% farther than our combustion gun. Both chambers were roughly the same volume. There was nothing special about either gun. Sprinkler valve on the pneumatic, and a grill igniter on the combustion. Both had 2" barrels at 3' long.


So what you mean to say is that your pneumatic launcher shoots 33% further than your combustion launcher. There are far too many variables involved in spudding to make blanket statements regarding all launchers of a certain type.
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Unread postAuthor: Brian the brain » Mon Dec 28, 2009 4:59 am

Too lazy to cut the pipes to size huh?
:D

Nice to see another Supahvalve pop up.
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Willdebeers » Mon Dec 28, 2009 5:53 am

I am very fond of those Supah Valves. How well do they work at low pressure?
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Unread postAuthor: Brian the brain » Mon Dec 28, 2009 6:34 am

Being a chambersealer with a big exposed surface I'm confident they will perform very well.,
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: psycix » Mon Dec 28, 2009 7:11 am

Barrelsealers may open later and faster though...
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