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Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: SpudBlaster15 » Fri Apr 06, 2007 12:23 am

crsaz wrote:no it was through a doyble layer


In that case, I blame the failure on the fact that the pipe used was cellular core, and was most likely previously weakened. Solid core DWV ABS would never fail in that manner.
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Unread postAuthor: risto » Fri Apr 06, 2007 11:30 am

was this new pipe you used, or did you find this ABS sitting around and decided to make it into a cannon?

from the looks of it, it was old pipe than had its structural integrity tested before and couldn't cope with the sudden pressure rise. Be glad you weren't holding it under your arm like most people do.
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Unread postAuthor: crsaz » Fri Apr 06, 2007 8:18 pm

no it was new pipe.
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Unread postAuthor: Bubba05 » Fri Apr 06, 2007 8:47 pm

New Pipe did that? WOW!! It must have been flawd or dammaged ither during casting or in transit to shop? Did you drop it by any chance. i know that type of pipe can damage easly.
A cunundrum has presented itself? you could always put it down to the hand of god. @&(*ed if i know why it just happened. Try again and see how you go if it is the materials your using or just a random act?
Good luck and try to have fun but be careful.

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Unread postAuthor: WOW!! » Fri Apr 06, 2007 9:28 pm

It looks like the chamber is rather long, possible the mix could have been to concentrated towards the back and then DDT happened?
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Unread postAuthor: SpudBlaster15 » Fri Apr 06, 2007 9:52 pm

Doesn't anyone else realize that the reason the pipe failed was due to the fact that it was cellular core pipe (as determined by observing the fracture points)? This type of ABS pipe can fail if used as a combustion launcher chamber. For all other theories...

-ABS does not weaken if dropped
-Solid wall ABS needs to be SEVERELY damaged in order to fail in this application.
-The chamber would have to be MUCH longer for an air/propane mixture to DDT.

Cellular core pipe + Pressure = Explosion.
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Unread postAuthor: frankrede » Fri Apr 06, 2007 10:09 pm

I refuse to accept that theory.
I have never heard or seen cell core abs fracture under normal circumstances.
His pipe must have been defective or had some irregularity.
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Unread postAuthor: SpudBlaster15 » Fri Apr 06, 2007 10:21 pm

Refuse all you want, but I can guarantee that you won't find an alternative reason.
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Unread postAuthor: fom » Fri Apr 06, 2007 10:26 pm

frankrede wrote:I refuse to accept that theory.
I have never heard or seen cell core abs fracture under normal circumstances.
His pipe must have been defective or had some irregularity.


How many people use cellular core ABS in combustions? Barely any from what I have seen. And its almost impossible to have a defect in a pipe, in the factory they check the pipe with really high tech stuff. And ABS is very durable, it would not crack or anything when dropped.
Cellular core is fine for a barrel but not chamber.
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Unread postAuthor: sjog » Fri Apr 06, 2007 10:28 pm

No one will accept the obvious,the barrel was jamed with wax.
CRSAZ did the load come out of the barrel????

I'm not sure if the projectile exited the gun
Have I missed that? No, I just looked again.
CRSAZ come on dude did the projectile exit the barrel?????????
That is question #1
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Unread postAuthor: super spuder » Fri Apr 06, 2007 10:38 pm

ok. i understand that cellular core is bad for potato guns. how do you tell cellular core from solid wall abs pipe.i have a pneumatic cannon and i have it upwards of 100 psi and it is made of old pipe i found laying around, and i want to know if it is cellular core, cause if it is i am going to take it apart it right away.but i don't know how to tell ?
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Unread postAuthor: sjog » Fri Apr 06, 2007 10:41 pm

Cell core is very light
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Unread postAuthor: WOW!! » Fri Apr 06, 2007 11:22 pm

SpudBlaster15 wrote:Refuse all you want, but I can guarantee that you won't find an alternative reason.


What about the time when Lucky13's Sch80 union blew up at 80psi? Things can be defective.
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Unread postAuthor: SpudBlaster15 » Fri Apr 06, 2007 11:33 pm

The union was most likely weakened/old. This pipe was new, and in good condition.
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Unread postAuthor: Bubba05 » Fri Apr 06, 2007 11:49 pm

Ive seen people stand on it and its shattered. and it was new pipe just from the shop. I know some one who is a irragation specalist he says the stuffs really not ment to have anything above 15psi of water presure.
the solid stuff can handle a little more.
Its no really recomended to push that much pressure thru them
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