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Corn 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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Unread postAuthor: Technician1002 » Thu Sep 05, 2013 3:46 pm

In regards to this image,

Image

I've not found a regulator that could provide the high volume of air needed directly for a cannon shot. Lose the regulator and relegate it to the supply compressor. Simply run your local supply tank at the max pressure the cannon is designed to use.

If you are using the hose for an accumulator, be sure it's volume and ID are sufficient for the flow needed. Large diameter hose is expensive and hard to find. It may also cause problems with cannon mobility. It's no fun fighting the force of a large hose trying to make itself straight. Best to run a proper chamber on the cannon and use a smaller 1/2 inch or so supply line to the cannon.
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Unread postAuthor: dart guy » Thu Sep 05, 2013 3:55 pm

that was just a rough idea because i didnt spend a week thinking about it
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fake sig,now what crap now i got to edit the rest
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Unread postAuthor: BigDeutcher » Fri Sep 06, 2013 6:03 am

Technician1002 wrote:In regards to this image,

Image

I've not found a regulator that could provide the high volume of air needed directly for a cannon shot. Lose the regulator and relegate it to the supply compressor. Simply run your local supply tank at the max pressure the cannon is designed to use.

If you are using the hose for an accumulator, be sure it's volume and ID are sufficient for the flow needed. Large diameter hose is expensive and hard to find. It may also cause problems with cannon mobility. It's no fun fighting the force of a large hose trying to make itself straight. Best to run a proper chamber on the cannon and use a smaller 1/2 inch or so supply line to the cannon.


I kinda wondered whether the regulator would be restrictive, hadn't planned on the regulator, i saw this as an unnesscessary expense. Thanks for the ideas and suggestions. Going to start my project this weekend and will post pics as I go allong. Will dry fit it all solicit feedback and give it a whirl.

Thanks again to all the contributors.

PS Image isn't mine but one i found on the net and it seemed to explain / demonstrate the theory behind a pneumatic spudder
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Re:

Unread postAuthor: matti » Thu May 15, 2014 12:43 pm

Technician1002 wrote:I've not found a regulator that could provide the high volume of air needed directly for a cannon shot.


I actually have one :D it's has 2" ports ! I'm not saying it would be good idea.. or cheap !

It's like this one: http://store.norgren.com/us/en/detail/r ... -relieving
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Re: Corn Cannon

Unread postAuthor: Fnord » Fri May 16, 2014 5:31 pm

I really have to advise against using plastic as any chamber material.
This is because plastic has a structural half-life of about 3 hours when kids are anywhere near it.
And I'm assuming most of us would feel bad if it blew up in billy's face. most of us.

Also you might consider slapping some fiberglass on the barrel. $10 fix that'll increase the safety factor considerably.

Easiest valve setup I can think of:
Bulk chamber -> accumulator chamber -> sprinkle valve -> restrictor valve -> barrel.
If your small chamber fills slowly you might not need to separate it from the bulk one.
The restictor valve can just be a 1" ball valve. Set it where you want then remove the handle.
If more power is required, omit it and mod the sprinkler to open pneumatically.
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