SpudFiles

everybody says that black pvc is weaker than white whats the difference but i heard that black pvc locks in heat more like on a sunny day and im confused on the fuel to use i use rain and stain repellent its ok i can shoot oranges in the sky till they disapeared out of sight wow its so flammable it says in BIG words on the froont danger fammable can someone thats smart about these tell me the fuels to use and projectiles to use [please respond to this] im new

ARGH!!! USE THE DAMN SEARCH ENGINE!!! IT'S THERE FOR A REASON!!!

1. There is no such thing as 'black pvc'. You are referring to ABS, and while the solid core variety is widely accetpted for use in a combustion cannons (not in pnumatics, you can only use pressure rated pvc for them), the cellcore variety is dangerous and may rupture. If you are using cellcore abs or cellcore pvc, DON'T USE THE GUN! Trash it and make a better one out of solidcore pipe, preferably pressure rated pipe and pressure rated fittings.

2. There are about 2 zillion topics on fuel and ammo, go search for them.

3. READ THIS, IT WILL ANSWER ALL YOUR QUESTIONS!!!

on a medium combustion cannon, abs is perfectly safe, i have used it on all my cannons (combustions) and there is nothing wrong with it. abs is also better in cold weather than pvc. the cannon in your video is fine for abs.

I know solid core ABS is fine, it is even preferred over pvc in combustions. But the pipe in the vid was cell core, like the gun in this thread. Look at the 8th post on the page.

What a long, rambling sentence. Use periods at the end of sentences please.

And if you just built one today you shouldn't be shooting it you should be waiting for the glue to cure .

how big is huge....

how big is huge.... when i think of huge i think of this http://www.spudfiles.com/forums/viewtopic.php?t=7093&
you made one that big?

Edit: oops srry 4 the double post

Insomniac wrote:ARGH!!! USE THE DAMN SEARCH ENGINE!!! IT'S THERE FOR A REASON!!!

1. There is no such thing as 'black pvc'. You are referring to ABS, and while the solid core variety is widely accetpted for use in a combustion cannons (not in pnumatics, you can only use pressure rated pvc for them), the cellcore variety is dangerous and may rupture. If you are using cellcore abs or cellcore pvc, DON'T USE THE GUN! Trash it and make a better one out of solidcore pipe, preferably pressure rated pipe and pressure rated fittings.

2. There are about 2 zillion topics on fuel and ammo, go search for them.

3. READ THIS, IT WILL ANSWER ALL YOUR QUESTIONS!!!

Oh please, be quite.
Cell core ABS is fine for basic combustions.

His pipe did not explode because it was cell core abs.
There were other factors involved.

as killagorilla once said, "did you by any chance come to this country on a floating door"?

Insomniac wrote:I know solid core ABS is fine, it is even preferred over pvc in combustions. But the pipe in the vid was cell core, like the gun in this thread Look at the 8th post on the page.

And what video do you speak of?

Insomniac, that gun had a chunk of wax jammed in the barrel so it couldn't slide out, any gun would have blown in that situation aside from metal.

@ Frankrede: The vid I am talking about is one that gattlinggun posted, it is a how-to on building an abs spudgun.

And LGM, a gun made of pressure rated pvcs would easily survive haveing it's barrel completely blocked.

That is why I don't like cellcore abs, IF the projectile gets stuck there is a chance of it blowing apart.

There must have been something else involved. I have taken cell core abs over 90 with no failure.
But what do I know.

Honestly, people, a propane combustion usually produces about 80 psi, and most fuels produce much less; therefore, why would the cannon blow apart? It's the same thing as pressurizing a pneumatic, just to a lower pressure, and faster.