New combustion cannon

Boom! The classic potato gun harnesses the combustion of flammable vapor.
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super spuder
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well i have not posted any of my guns on here for a while because no one liked me using ABS for pneumatics, so i was bored today and i had found a bunch of crap laying around and decided to build a combustion gun :P so after all the ABS glue fumes had gone away, this is what i had
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pretty simple design, a monkey could probly build it, and best of all it cost me 7$ to build :wink:
trying to decide on a new project, probably something small.
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HaiThar
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Damage pics woudl be nice :D. And I dont think its that people dont like ABS...its that they dont like non-pressurerated ABS. Also your reducer is DWV... :?
Last edited by HaiThar on Sun Sep 23, 2007 8:37 pm, edited 1 time in total.
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super spuder
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well i have to find something to shoot out of it first. but when i do i will get some up here
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thats my super special ignition system !
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mopherman
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super spuder wrote:well i have to find something to shoot out of it first. but when i do i will get some up here
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thats my super special ignition system !
lighter?
We didnt like your pneumatic because we already get bad press, and some kid losing his hearing to a "dangerous weapon" doesnt help.
anyway, nice cannon. you should make more combustions
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super spuder
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well what ever, i am confident in my " SOLID" walled ABS. I am planing on making more combustions, i hate only being able to shoot where my air compressor is

EDIT: yea, its a BBQ ignitor with the flame still working, and i can use just the spark to, i wanted to see if the flame would give better performance than just a spark
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HaiThar
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Also, I question why you would use ABS over PVC in a pneumatic gun? The only reason I could think of for using ABS would be because it is more chemically resistant, but you dont use chemicals in a pneumatic gun...
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super spuder
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well if i answer that is is going to start an argument... this is the combustion show case :lol:
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HaiThar
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Ermm its the combustion dicussion m8 :wink:
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super spuder
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oh crap... so it is
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psycix
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super spuder wrote:well if i answer that is is going to start an argument... this is the combustion show case :lol:
Answer, please!
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super spuder
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well if you must know, i used ABS because i can not get presure rated PVC around here, the only way i can get it is to drive 1 hour north, and i am not going to wast my time driving down there to get some stuff, then realize that i need other things

PS: could a mod move this to combustion show case pleas
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DYI
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ABS has better chemical and UV resistance, higher impact resistance, and a much cleaner mode of failure than PVC. But yeah, don't use DWV plastic pipe (be it ABS or PVC) in a pneumatic cannon.

Nice simple cannon, looks like fun to shoot. The chamber seems a bit oversized though.

@Haithar: the entire gun is DWV, not only the reducer. As long as it's solid wall, it's fine for a combustion. Cell core may also be OK, but it certainly isn't recommended.
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super spuder
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i was just out shooting it, it is pretty loud :lol:
Last edited by super spuder on Mon Sep 24, 2007 6:44 pm, edited 1 time in total.
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Fnord
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Couldn't you just pm a mod? I'm sure somebody wouldn't mind moving it so you don't lose the comments.
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super spuder
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hmm, could do that, think i will...
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