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sweet pneumatic video

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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that is sweet
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not too bad
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Total votes : 6
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sweet pneumatic video

Unread postAuthor: super spuder » Sat May 19, 2007 10:01 pm

For any one that was on this http://www.spudfiles.com/forums/new-pis ... t8102.html page. there was allot of people that did not belive that my cannon actually fired, so this is my proof that you are wrong, don't bother wasting your time telling me not to use ABS in a pneumatic, i have heard enough of that already. So for any one who doubted me, here is is, this video was taken at about 100 pis, the target is 1/2 inch press board, ammunition is the inside of a golf ball, out come is a 1 1/2 inch hole in the wood, and a dent in the post.
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Unread postAuthor: homedepotpro » Sat May 19, 2007 10:55 pm

thats proof enough to me
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Unread postAuthor: Velocity » Sat May 19, 2007 11:18 pm

Nice... but did GGDT really predict that it would fire at over 800 FPS?
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Unread postAuthor: clide » Sat May 19, 2007 11:40 pm

I don't doubt that it will fire, but I doubt that it will fire well (compared to a more traditional piston valve).

I also doubt that the duct tape makes an effective seal. It sounds to me in the video that air is still flowing in as it is being fired. You might be able to get duct tape to seal decently for a few shots if you really jammed the piston in there, but I think it would have to be repaired every few shots if not every shot.

rmich...nope not unless he did the GGDT horribly wrong. I ran the numbers in there and the highest speed I could get with the gun was 440 fps... with a 6 gram projectile.
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Unread postAuthor: Velocity » Sat May 19, 2007 11:45 pm

I didn't think so either... I was just reading the numbers put out at the top of his other thread.
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Unread postAuthor: SpudBlaster15 » Sat May 19, 2007 11:59 pm

Yeah! You're my hero! Proof that an ABS pneumatic is indeed not a death trap.
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Unread postAuthor: super spuder » Sun May 20, 2007 12:06 am

umm.well first off, a golf ball is not 6 grams, and 2, the reason there is still air rushing out of the barrel is because the air compressor is still hooked up to the chamber. and last but not least, yes i did do GGDT wrong the first time, i did it right and got around 750 fps. By the way, duck tape works great as a seal and i have not replaced it yet over 30 shots.
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Unread postAuthor: origin unknown » Sun May 20, 2007 12:08 am

Hardly anyone has ever used ABS in a pneumatic before. I guess it doesn't hurt to try new things.
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Unread postAuthor: clide » Sun May 20, 2007 12:14 am

SpudBlaster15 wrote:Yeah! You're my hero! Proof that an ABS pneumatic is indeed not a death trap.


Hardly "proof". It proves that <b>his</b> gun in <b>those conditions</b> isn't a death trap, but the lack of standards for DWV pipe makes it extremely unwise to use one example as proof of anything. Besides, whose to say that 1 psi more, 1 degree raise in temperature, or the small amount of fatigue caused by each shot doesn't push the gun over the edge on the next shot.

super spuder wrote:umm.well first off, a golf ball is not 6 grams, and 2, the reason there is still air rushing out of the barrel is because the air compressor is still hooked up to the chamber. and last but not least, yes i did do GGDT wrong the first time, i did it right and got around 750 fps. By the way, duck tape works great as a seal and i have not replaced it yet over 30 shots.


I am talking about the sound of air still filling before the gun is fired, not after.

I know well that a golf ball is not 6 grams, it is 45, but I was using the 6 grams example because that gave the highest speed I could obtain with the gun. 45 grams gives me 335 fps.
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Last edited by clide on Sun May 20, 2007 12:18 am, edited 1 time in total.

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Unread postAuthor: super spuder » Sun May 20, 2007 12:18 am

ok seriusly, i will tell you, dont try this, unless you are like me and incredibly stupid lol is that good enough for you?
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Unread postAuthor: clide » Sun May 20, 2007 12:23 am

That little rant on ABS wasn't directed at you super, I know you know our stance on it and you never proclaimed it to be safe. I just can't stand people declaring that something is safe after one or two people do it without killing themselves.
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Unread postAuthor: super spuder » Sun May 20, 2007 12:28 am

and the sound of air still coming in the chamber before it is fired is because i fired it prematurely. i can get it to stop making any noise at all, but i was trying to keep the video short cause my computer takes forever to upload videos. i am not trying to say that it is OK to use ABS in a pneumatic, all i am saying is that is all i have, and that is what i am going to use.
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Unread postAuthor: rna_duelers » Sun May 20, 2007 12:30 am

I would prefer all my limbs and use pressure rated pipe,as ABS pipe isn't pressure rated for a reason(unless you get the special kind).As for 800fps,unlikely.
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Re: sweet pneumatic video

Unread postAuthor: super spuder » Sun May 20, 2007 12:30 am

"don't bother wasting your time telling me not to use ABS in a pneumatic, i have heard enough of that already." my selfe

Merged:
rna_duelers wrote:
I would prefer all my limbs and use pressure rated pipe,as ABS pipe isn't pressure rated for a reason(unless you get the special kind).As for 800fps,unlikely.


for one- i presure test my own pipe
two- can you not read- i said " i did it wrong, it is closer to 750fps"
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Unread postAuthor: SpudBlaster15 » Sun May 20, 2007 12:33 am

I am severely annoyed by individuals who automatically believe that because ABS is unrated, it is unsafe to use. I have pressurized 3" DWV ABS to 120psi at -25*C, and left it for 12 hours with no failure. I have ignited a stoichiometric propane/oxygen mixture inside a closed ABS chamber, once without failure, the 2nd time it split lengthwise with no shrapnel production. Stoichiometric propane/air has no effect on a closed ABS chamber. It is safe to use.
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