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My first Pneumatic Cannon Showcase... but will it blow

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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My first Pneumatic Cannon Showcase... but will it blow

Unread postAuthor: sumisukyo » Thu Nov 18, 2010 3:56 pm

Hi guys I'm new to the site but have been a big fan of the spud cannons since I started tinkering with smoke bombs and electronics.
When I found this site it was a god send, I always hated the fact that u could only get a single shot out of them, but know with all your expertise and Knowledge on modified sprinkler valves my first gun will be
A Pneumatic Cannon DRAGONNORV !!!

so here are my prototype pictures
PS just ruff build to test if the system works then ill make it look realistic

<a href="http://www.flickr.com/photos/24974530@N03/5188107218/" title="IMG_20101118_222218 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4124/5188107218_80193eec58.jpg" width="500" height="376" alt="IMG_20101118_222218"></a>

OK MY BIG QUESTION !!!! will this work ???
I mean all the plastic bits worry me.

<a href="http://www.flickr.com/photos/24974530@N03/5188108000/" title="IMG_20101118_222228 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4084/5188108000_352b5c1007.jpg" width="500" height="376" alt="IMG_20101118_222228"></a>

Close up of bend to canister

<a href="http://www.flickr.com/photos/24974530@N03/5188108654/" title="IMG_20101118_222238 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4126/5188108654_beb496c6e0.jpg" width="500" height="376" alt="IMG_20101118_222238"></a>

12 Bar (300 psi) pressure gauge

<a href="http://www.flickr.com/photos/24974530@N03/5187508911/" title="IMG_20101118_222248 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4145/5187508911_5972b3fdf8.jpg" width="500" height="376" alt="IMG_20101118_222248"></a>

This is the part that worries me its plastic and is secured by PTFE thread seal tape

<a href="http://www.flickr.com/photos/24974530@N03/5188110232/" title="IMG_20101118_222255 by crks_wolf, on Flickr"><img src="http://farm2.static.flickr.com/1296/5188110232_9d31a989a8.jpg" width="500" height="376" alt="IMG_20101118_222255"></a>

The blow gun I'm using the nozzle bit is busy drying its PVC glued to the original screw top and I'm going to re-screw it into the top and drilled through the top cap so it fits snugly.(ill post more on that tomorrow night)

<a href="http://www.flickr.com/photos/24974530@N03/5187510501/" title="IMG_20101118_222733 by crks_wolf, on Flickr"><img src="http://farm2.static.flickr.com/1290/5187510501_f05bd05fa1.jpg" width="500" height="376" alt="IMG_20101118_222733"></a>

started on the Stock of the gun used pencil to shade the wood to give u a better idea of what it will look like in the end.


Any advice would be most helpful !!!! Thanks and Congratz on an amazing site
:update*
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Last edited by sumisukyo on Fri Nov 26, 2010 2:14 pm, edited 1 time in total.

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Unread postAuthor: Technician1002 » Thu Nov 18, 2010 5:26 pm

Check the pressure rating on the blowgun. It will be fine as a trigger up to the pressure rating. At higher pressure you are in possible fail mode.
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Unread postAuthor: Gippeto » Thu Nov 18, 2010 5:36 pm

What concerns me in the most immediate way...is that you've got a co2 tank hooked up with the plastic bits. :shock:

Tell me you don't intend to pressurize that contraption with co2....Please?

If you dare answer "yes", you get one of these...

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Unread postAuthor: jackssmirkingrevenge » Thu Nov 18, 2010 11:31 pm

Agreed with the above, unregulated CO<sub>2</sub> will blow that valve to smithereens. Good for about 150 psi though ;)
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Unread postAuthor: sumisukyo » Thu Nov 18, 2010 11:36 pm

well I'm still going to get the correct tubing connector but that was my main concern what are my options
how do I
A. get it to handle the pressure
or
B. regulate the pressure down to 150
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 18, 2010 11:45 pm

A. use a better rated valve, say a QEV (still not guaranteed to hold the pressure but some peopme have used them) or a spring-loaded ball valve

B. Buy a regulator, eBay paintball supplies would be your most economical bet.
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Unread postAuthor: Gippeto » Fri Nov 19, 2010 12:38 am

I vote regulator....

I have a Palmers pursuit female stabilizer (always brings a smirk :wink: )...pretty good regulator. Threads onto the bottle, and has 1/8"npt outlet. Adjustable from 0 right to 900psi. Lots of room for growth.

Not cheap though.

I'm sure you can find a reg for less that'll work for ya. If you wish to....find one, post it here, and someone can verify that it'll do what you need before you lay down your hard earned...not all regs are equal.

Aside....co2 at room temp is ~850psi. It WILL reach much higher pressures if it's warmer. I'm guessing that since you put a 300psi gauge on there, that you didn't know this....now ya do. :)

You've also hooked your blowgun up backwards. It's alright to try it that way, (maybe you get lucky?) but I wouldn't expect it to seal.

If you want help...it's available for the asking.
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Unread postAuthor: POLAND_SPUD » Fri Nov 19, 2010 12:42 am

female stabilizer
Image??

:D
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 19, 2010 12:50 am

POLAND_SPUD wrote::D


LOLOLOLOL!

Surely that will work as a male stabiliser too :roll:
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Unread postAuthor: sumisukyo » Fri Nov 19, 2010 12:57 am

Gippeto wrote:I vote regulator....

I have a Palmers pursuit female stabilizer (always brings a smirk :wink: )...pretty good regulator. Threads onto the bottle, and has 1/8"npt outlet. Adjustable from 0 right to 900psi. Lots of room for growth.

Not cheap though.

I'm sure you can find a reg for less that'll work for ya. If you wish to....find one, post it here, and someone can verify that it'll do what you need before you lay down your hard earned...not all regs are equal.

Aside....co2 at room temp is ~850psi. It WILL reach much higher pressures if it's warmer. I'm guessing that since you put a 300psi gauge on there, that you didn't know this....now ya do. :)

You've also hooked your blowgun up backwards. It's alright to try it that way, (maybe you get lucky?) but I wouldn't expect it to seal.

If you want help...it's available for the asking.



Thanks allot I'm loving this site.
Thanks for pointing that out I just put everything together for a quick photo.

so a Regulator it is :D PS I live in South Africa currently hobby shops and the same brands u have are hard to come across but ill try my best.
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Unread postAuthor: sumisukyo » Fri Nov 19, 2010 1:01 am

Gippeto wrote:Aside....co2 at room temp is ~850psi. It WILL reach much higher pressures if it's warmer. I'm guessing that since you put a 300psi gauge on there, that you didn't know this....now ya do. :)


ya seeing as how i live in South Africa (very hot) id better ramp it up then :D
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 19, 2010 1:05 am

Instead of a regulator, you can hook the CO<sub>2</sub> tank directly to a pressure washer valve along these lines, and depending on your projectile choice, use a detent to allow pressure buildup and compensate for the low flow, add a magazine and you have a semi-auto easily ;)
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Unread postAuthor: Gippeto » Fri Nov 19, 2010 1:06 am

:lol: Nothing works....and you BOTH know it. :wink:


Edit....ooookayy...that ship sailed. :roll:

Moving on. :)
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Unread postAuthor: sumisukyo » Fri Nov 19, 2010 1:29 am

jackssmirkingrevenge wrote:Instead of a regulator, you can hook the CO<sub>2</sub> tank directly to a pressure washer valve along these lines, and depending on your projectile choice, use a detent to allow pressure buildup and compensate for the low flow, add a magazine and you have a semi-auto easily ;)


that looks a bit complicated for me to do on my first go but i can see the concept if the regulator idea doesn't work ill have to try my hands on that

PS. what do u think of the stock everybody I'm busy finishing it off now as we speak

Here are the pics of it half done, just got to thin the grips out for a more comfortable holding.

<a href="http://www.flickr.com/photos/24974530@N03/5188645155/" title="IMG_20101119_092649 by crks_wolf, on Flickr"><img src="http://farm2.static.flickr.com/1023/5188645155_8349a79b1e.jpg" width="500" height="376" alt="IMG_20101119_092649"></a>


And also will this work its PVC glue set over 12 hours gonna leave it for longer thou.

<a href="http://www.flickr.com/photos/24974530@N03/5188644763/" title="IMG_20101119_083225 by crks_wolf, on Flickr"><img src="http://farm2.static.flickr.com/1004/5188644763_0454341358.jpg" width="376" height="500" alt="IMG_20101119_083225"></a>

it goes between the blow gun and the sprinkler valve.

ow ya and i wish to shoot these

Image

but at a real paintball sniper or close to Level.

So todays question is how much PSI could my sprinkler valve handle the blowgun says 12bar.

and also if i wanted this to be at the max the sprinkler valve can handle which of the plastic parts need to be removed LEFT or RIGHT or BOTH

<a href="http://www.flickr.com/photos/24974530@N03/5189260400/" title="IMG_20101118_222228_2 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4030/5189260400_7bb0e643ee.jpg" width="500" height="376" alt="IMG_20101118_222228_2"></a>
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 19, 2010 3:00 am

PVC glue? I hope you don't mean PVA :shock:

Get yourself some proper epoxy, check out the how-tos here and here - or at least use Araldite/JB weld or similar.

So todays question is how much PSI could my sprinkler valve handle the blowgun says 12bar.


Sprinkler valves are normally rated to 10 bar max, as to the plastic connections the sprinkler valve will blow up long before they do ;)
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