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A place to ask general spud cannon related questions.
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Unread postAuthor: 91sport_tn » Fri Oct 09, 2009 10:04 pm

I am new here but I have been lurking for a while.
I have been aware of spudguns though I have not considered building until recently.

91sport_tn wrote:I decided not to ramble in my first post, but now looking back, it was pretty pathetic.

pneumatics sparked my interest in building, but I decided to make a simple combustion cannon as my first.

I threw together 2 crappy small combustion guns in the past couple of days, due to all the rain here, but both of them got blown apart. I assume this was because I did not bother to make them airtight at all.

I have all my parts for my full sized spray and pray and am waiting for a dry day to build it. my concern is the bigger gun staying together. I have pressure rated pvc and duct tape, will this be enough with proper sealing?

sorry if this is in the wrong area.


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Unread postAuthor: pizlo » Fri Oct 09, 2009 10:44 pm

Yeah there isn't really an area for that... but learn this fast, never double post, always use the handy little EDIT button to revise your first post.


MORE IMPORTANTLY: anything less than PVC primer AND cement used properly could get you killed! duct tape is a huge no no! get the primer, get the cement, learn how to use it and be safe.

On second thought is you were gonna build a gun with pvc and duct tape, your probably shouldn't make one at all... because there are high chances you will injure you or someone around you/give spudding a bad name. THink with you head please, not your ass.
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Unread postAuthor: jrrdw » Sat Oct 10, 2009 5:49 am

General Spud Cannon Related is the proper section due to mention of two types of cannons. Use the Wiki button up top of the page and search the term "Solvent Welding".

After you dig up all the information your looking for post your lay out in the proper "Discussion Section" and ask any questions you might have for the experienced builders.

Welcome to Spudfiles.
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Unread postAuthor: vardas » Sat Oct 10, 2009 6:44 am

hi, welcome to spud files!! please , please use the proper primer & glue. wash your parts & let them dry. then lightly sand & wipe clean but most importantly give a full 24 hours to dry/cure before you shoot . be safe and have fun! :D p.s. duct tape looks ghetto
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Unread postAuthor: 91sport_tn » Mon Oct 12, 2009 12:14 am

sorry guys, I meant wrapping the gun in duct tape after cementing.
I'm bad about not typing all that i am thinking.

I do have common sense, I just have trouble showing that in text. I was just introducing myself, and I did not want to start a big discussion in the wrong place. sorry guys.
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Unread postAuthor: vardas » Mon Oct 12, 2009 5:45 am

no need to wrap in duct tape if all your making is a simple spray & pray. unless thats the finish you wanted ,the pressures involved wont be a problem as long as you've used the proper primer & glue and waited for it to cure. a good/cool idea is to try to build in a way as to upgrade this cannon into an advanced. fan,meter, spark strip.ect.ect.p.s. dont forget to post pics!!
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Unread postAuthor: jmadden91 » Mon Oct 12, 2009 6:01 am

vardas wrote:no need to wrap in duct tape if all your making is a simple spray & pray


No need to wrap it in duct tape period. Duct tape will do nothing in the case of an explosion. It does not increase the pressure rating at all.

@ 91sport_tn: Welcome to spudfiles
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Unread postAuthor: rcman50166 » Mon Oct 12, 2009 11:39 am

I did it to my first sizable combustion actually. It's really just a safety net to prevent shrapnel from flying in case of structural failure. If the duct tap is in a tight enough pitch, the chamber feels softer. It may help pneumatics survive drops a little better. But it is by no means a better method of protecting your cannon than being smart about it. :wink:

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As for pressure rating, I've always thought pretensioned fishing line wrapped multiple times would increase the rating. If you are careful enough you can wrap fishing line around a cardboard tube and see what I'm talking about. The line adds massive amounts of rigidity and exterior pressure. The theory is that the amount of exterior pressure added to the pressure vessel will add to the overall rating of it. But good luck trying to add something like 300 psi of tension in fishing line...
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Unread postAuthor: 91sport_tn » Mon Oct 12, 2009 1:16 pm

Alright, thanks for all the input. I will keep it in mind.
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Unread postAuthor: psycix » Mon Oct 12, 2009 1:18 pm

Incoming JSR-imitation!

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