10' Pneumatic Spudgun

[Tidbit77]

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][/youtube]

[jackssmirkingrevenge]

Nice, I especially liked the barrelless paper shot

What pressure are you running at?

[Tidbit77]

I'm running between 100-120 psi, although I think the paper shot is at 50 psi...I don't quite remember.

[psycix]

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.

[Tidbit77]

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?

[McCoytheGreater]

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?

[SpudBlaster15]

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[McCoytheGreater]

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.

[Tidbit77]

GGDT predicts 796 fps for the arrow.

[SpudBlaster15]

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[Brian the brain]

Too lazy to cut the pipes to size huh?


Nice to see another Supahvalve pop up.

[Willdebeers]

I am very fond of those Supah Valves. How well do they work at low pressure?

[Brian the brain]

Being a chambersealer with a big exposed surface I'm confident they will perform very well.,

[psycix]

Barrelsealers may open later and faster though...