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PVC safety qes

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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PVC safety qes

Unread postAuthor: wyz2285 » Mon Mar 14, 2011 4:05 pm

Hi to everyone
As i have build my pvc spudgun, after few shots, i was worry about the safety of my gun.
So can anybody tell me a more or less precise pressure of a combustion gun is able to produce. most of people told me a pressure between 6 to 8 bar.
If that´s true, is that safe to make a gun with a coke bottle? because I´d like to make a clear combustion, they looks very cool but I can´t get any clear PVC.
And by the way here are some most common designs, can anybody tell me their weak points? witch of them is safer?
Thanks
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My gun is the 2 type, co-axial.
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Unread postAuthor: Gun Freak » Mon Mar 14, 2011 4:08 pm

A coke bottle should be fine for a 1x combustion.

I don't know about 2 and 3 but for the first one here is stress on the elbows if you dont have good barrel support.
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Unread postAuthor: wyz2285 » Mon Mar 14, 2011 6:08 pm

A coke bottle should be fine? That's great news for me :) about the 1 design i thought the same thing. Any idea about the rest and the pressure a combustion can produce? Thx
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Unread postAuthor: Gun Freak » Mon Mar 14, 2011 6:45 pm

The max pressure a metered combustion can make I think is around 120 psi. With a properly connected coke bottle, such as in this one, you will probably be fine.
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Unread postAuthor: Lockednloaded » Mon Mar 14, 2011 6:46 pm

I wouldn't recommend drilling any holes through the soda bottle, unless its through the neck. Also, I don't know where you live, but some European countries have bottles that are meant to be reused; those bottles are much stronger, so depending on where you are, you should try to get one
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Unread postAuthor: Gun Freak » Mon Mar 14, 2011 6:50 pm

Yeah, drilling through it is never good; use a tee or something to attach a fill valve.
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Unread postAuthor: Crna Legija » Mon Mar 14, 2011 8:01 pm

theres a combution cannon somewhere on spudfiles, were someone used normal white pvc. Cut a window in one side and covered it in clear plastic. Held it down will lots of screws around it.
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Unread postAuthor: wyz2285 » Tue Mar 15, 2011 11:34 am

First thank you all :)
I won't drill any holes on the bottle, and actually i found a type of bottle (from a drink) that's feels much stronger than normal coke bottles, probably i will use it. I thout the idea of cut a window on pvc tube, but i was worried that will weak the chamber. Thanks for help :)
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