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Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Should I Paint It?

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Unread postAuthor: joannaardway » Tue Mar 13, 2007 9:55 am

I'm envious. Nice work.
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Unread postAuthor: airpress » Tue Mar 13, 2007 1:11 pm

Cool looking gun, i love steel cannons!!
What is the chamber diameter?
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Unread postAuthor: imablackskater » Tue Mar 13, 2007 2:03 pm

that is one of the sickest guns ever

i also have a question. Im working on a gun that has a reg on it like yours but I'm not shure if it is a reg since i looked inside it and it looks like a ball valve with a gauge on it to me.
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Unread postAuthor: chaos » Tue Mar 13, 2007 3:09 pm

that pipe is fine with 200psi, hell that pipe would be fine up 300, well maybe not the sprinkler valve, but the pipe could hold that pressure without a doubt.

peace
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Unread postAuthor: joannaardway » Tue Mar 13, 2007 3:55 pm

I think sprinkler valves have been hydro-tested to 400 psi. I wouldn't go anywhere near that though. Flaws and defects do occur quite often.
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Unread postAuthor: Bluetooth » Tue Mar 13, 2007 4:05 pm

Awesome. Very nice job. One question though: Why the hell would you paint the tip of the barrel orange??!! That means it is either airsoft or nothing comes out of the barrel.
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Unread postAuthor: risto » Tue Mar 13, 2007 4:09 pm

safety reasons. so no one mistakes it for a real gun. i would assume
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Unread postAuthor: loganphyve » Tue Mar 13, 2007 5:46 pm

Thanks for the notes on the pressure, do know that It will never get charged higher than 125-150 PSI. I Manage a truck garage and am very familiar with what happens with excess, uncontrolled power. Bearing that in mind, you should never reach more than 85% load capacity for fear of invisible stess damage - it adds up fast.

The flow corrector works on the theory of air dispersion, the same thing that keeps a hovercraft afloat a blanket of air. The pressure of the air underneath these vehicles is spread over a great surface area, giving even dispersion of lifting power. The flow corrector does the same - take a look at these diagrams I sketched up - you will see that that it is very similar in nature to the dispersion method of a hovercraft, rather this design focuses on making the flow uniform and unidirectional, thus rendering more initial power. Disney uses this same design in their water fountains that shoot perfectly tubular streams of water through the air without loosing surface tension and maintaining a floating "tube" of water. This is because the fluid (liquid or gas) is travelling uniformly as it is expelled.

BTW- That orange tip was just the thread protector that came with the tube stock. It is a 1" diam. Barrel. I have plans to rifle either a steel or ABS barrel at a local machine shop or perhaps remington arms factor, which is about 3 miles away from where I work.

Side note : My friend, a mechanical engineeer, stakes that this steel tubing would take in upwards of 800 - 1000 PSI of pressure, making it ideal for either pneumatic or combustion purposes. This Is the third cannon that I havfe built. The first two were constructred with my engineering friend, Ryan, LordDarPhyve. Both were steel, one pneumatic and one propane/flint combustiuon. The thought of rupturing plastic makes me shudder. I absolutely refuse to use a material that stresses with heat, cold, chemicals, sunlight, etc...


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Flow Correction Diagram and Theory
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Unread postAuthor: Hotwired » Tue Mar 13, 2007 6:12 pm

The flow corrector sounds plausible.

Whats it made from?

I have this sudden urge to stuff a cut down bundle of drinking straws in just after the valve in my cannon to see if it makes a noticeable difference :)
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Unread postAuthor: loganphyve » Tue Mar 13, 2007 6:15 pm

You guessed it - drinking straws crammed into a small 1" dia pipe with a retaining screen to keep them arranged properly. You would notice a slight twist in the arrangement if looking on from the front.

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Unread postAuthor: FeLeX » Thu Mar 15, 2007 7:54 am

Hey dude sweet cannon!! Where did you get a compressor like that and do you think it would be possible to make it fully portable?
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Unread postAuthor: loganphyve » Thu Mar 15, 2007 8:32 pm

The compressor was purchased at harbor freight tools. I actually used components from two different compressors, but the the motor and pump assembly came from same unit. The guage in the compressor housing came from another small compressor. One would have been enough but I thought the fit was better with the other guage. There were several to choose from, and unfortunatly, they only had the twenty dollar version, so I bought that. A week after dismantling it, I found another at work... Figures. :!: You can get one of these for 5 bucks on sale at harbor freight or order one offline at this link:

Image
CLICK FOR INFO
I was entertaining the thought of using the other compressor as well, to cut the "charging" time in half. Likewise, that would also cut battery time in half if I did decide to add an onboard power source.


imablackskater wrote:Im working on a gun that has a reg on it like yours but I'm not shure if it is a reg since i looked inside it and it looks like a ball valve with a gauge on it to me.


You should check the packagine it came with, or test it for functionality, The reg I used can also be purchased at harbor freight tools, at a relatively low cost. You will have to modify it, however. The air couplings on my reg were incompatible withe the barbs and hose i was using, and since I had to adapt it, I had to use a tap and die set to turn several adapter pieces. Take the time to shop for the right components... it pays off. It took me almost four months in my spare time to finish this beast.



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Last edited by loganphyve on Thu Mar 15, 2007 8:51 pm, edited 1 time in total.
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Unread postAuthor: Flying_Salt » Thu Mar 15, 2007 8:47 pm

Very, very, nice! I like metal guns, especially the ones with an onboard compressor. I've tried one similar to that, about 9 volts, and it couldn't really pump up my pneumatic (2 chambers joined by a tee) past 30 psi

Have you thought of modding the blowgun valve? It helps it dump the air a lot faster.
I really like the flow corrector thing, I will definitely have to try it, I may even put it in my current pneumatic.
I think you should paint it black with red fittings :D
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Unread postAuthor: loganphyve » Thu Mar 15, 2007 9:06 pm

Flying_Salt wrote:Have you thought of modding the blowgun valve? It helps it dump the air a lot faster.


I do not believe a modification would be absolutely necessary... The trigger used here is not a blowgun, rather a remote tire filler for big trucks. It is specifically designed to A) have a higher airflow due to less restriction (it has no blowgun style venturi), and B) hold pressure in both directions.

If you look in the phioto album link in my first post, you can see several other ports that are capped off which had extraneous pieces and/or parts threaded in.
<a href="http://picasaweb.google.com/bradford.gorea/SpudCannon/photo#5037935044293830482"><img src="http://lh6.google.com/image/bradford.gorea/RepXOwygJ1I/AAAAAAAAAEU/hxgTYOdH6I0/s144/03-03-07_2005.jpg"></a>
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Unread postAuthor: c19o » Thu Mar 15, 2007 9:09 pm

you should put a homemade piston valve on that thing, then it'll be way more powerful, and be able to handle higher pressure than a sprinkler valve. Nice gun.
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