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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: crsaz » Wed Apr 04, 2007 9:56 pm

its just covering up the screws for ignition points
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Unread postAuthor: PCGUY » Wed Apr 04, 2007 9:58 pm

Ah, well that is real weird, I guess it turns out that ABS doesn't really tear!

It must have been somehow weakened/damaged however, since plenty of people use ABS just fine all of the time.
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Unread postAuthor: BC Pneumatics » Wed Apr 04, 2007 10:06 pm

<s>The electrodes, I assume.</s>

Sorry, didn't realize there was another page.
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Unread postAuthor: pyromanic13 » Wed Apr 04, 2007 10:18 pm

shens revoked
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Unread postAuthor: frankrede » Thu Apr 05, 2007 12:02 am

sjog wrote:If you jam a plug in almost any combustion gun it will blow up.
Key word: Combustion -- Not as in fire ,as in bang!

That is not true.
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Unread postAuthor: clide » Thu Apr 05, 2007 12:20 am

I've seen pics of ABS shatter into pieces before, but that was a propane and oxygen injected shot, never would have expected it with just propane. Was it cold outside when you were shooting?

The extent of the failure is still far less than what a similar failure in PVC would have done. Notice that the cracks were able to stop themselves from propagating and let the gun remain mostly intact. You would never see that on PVC.

I would never use a cell core gun, but if I was held at gunpoint to fire either a cell core PVC gun or a cell core ABS, I would fire the ABS.

Thanks for the pics and glad you are OK
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Unread postAuthor: SpudBlaster15 » Thu Apr 05, 2007 12:22 am

I never did like the idea of using cellular core ABS as a combustion gun building material. If you can't find solid wall ABS, stick to pressure rated PVC. Cellular core ABS WILL fragment like that if it fails, unlike solid wall ABS. I didn't think such an event would occur under the pressure circumstances found in a standard combustion gun, however.
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Unread postAuthor: joannaardway » Thu Apr 05, 2007 12:25 pm

Yup - in that case, my BS-meter seems to be fine.

Given this incident, perhaps we need to reconsider construction materials. Inevitably, this will come up in the next ABS vs PVC debate.
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Unread postAuthor: Matheusilla » Thu Apr 05, 2007 1:14 pm

Is/was the pipe old? aged? left in the sun? exposed to ozone? and, yes, was it cold out? have you ever used anything other than propane in it, like a solvent based fuel?
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Unread postAuthor: crazyfreak0075 » Thu Apr 05, 2007 1:58 pm

Man that gun is looking weird what was the design for it, is there a barrel attatchment. Lol. looks more like a pipe bomb to me.
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Unread postAuthor: crsaz » Thu Apr 05, 2007 5:10 pm

the barrel screws on thats a 2 inch male threaded adapter on the end.

no it wasn't cold out it was like 80 degrees out
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Unread postAuthor: SpudBlaster15 » Thu Apr 05, 2007 7:59 pm

Did you install your electrodes through a single layer of ABS pipe, rather than an area where a fitting overlaps the pipe?
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Unread postAuthor: crsaz » Thu Apr 05, 2007 8:04 pm

no it was through a doyble layer
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Unread postAuthor: Bubba05 » Thu Apr 05, 2007 9:40 pm

Dude!!! wheres my hand? wow well its good to here ur ok!!
Just by looking at it there may have been stress fractures in the plastic the way it cracked then split? dono!
Ur ok thats the main thing. Dont give up on it yet mate ive had 3 shapnel on me and im still building!!

Bubba
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Unread postAuthor: Redcoat » Thu Apr 05, 2007 10:08 pm

Glad to hear you're ok.What do your parnts think about the whole spud gun thing now?
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