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High Pressure Copper Coaxial .22 Pellet Gun

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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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: sagthegreat » Sat Jan 04, 2014 3:31 pm

how did you calculate that?
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gun Freak » Sat Jan 04, 2014 3:51 pm

sagthegreat wrote:how did you calculate that?


Calculated the volume of my chamber and researched for the volume of a 5 lb co2 tank, then used the P1V1=P2V2 formula.
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: bravootome » Sat Jan 04, 2014 4:03 pm

Gun Freak wrote:'Tis always warm in sunny south Florida ;) I would not notice a difference between 80F and 70F


@Hawktalk- I used a neoprene washer that I bought at the hardware store.

Nanyway what is this neoprene ? i google it but it looks like rubber.
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Last edited by bravootome on Sat Mar 08, 2014 9:56 am, edited 2 times in total.
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: mark.f » Sat Jan 04, 2014 8:47 pm

Looks good, and I like the sturdy looking bent tube stock... makes it look WW-II resistance-weapon-ish.

Also, nice Schrader valve. :wink:
scrot-20140104-1388885747.jpg
scrot-20140104-1388885747.jpg (33.13 KiB) Viewed 550 times


EDIT: laughing now because my image shows next to the thread in the index. :blackeye:
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: jackssmirkingrevenge » Sun Jan 05, 2014 6:02 am

HAHAHAHAHAHAHA!

I just saw the schrader valve in the thumbnail :D

Well played young man.

edit: ah mark if was you, there I was thinking Gun Freak had risen in the ranks :roll: :D
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gun Freak » Sun Jan 05, 2014 8:59 am

@bravootome- it is rubber, but I use neoprene that is pre-formed into a washer shape.

@mark f- This is more along the lines of what I was thinking...
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: mark.f » Sun Jan 05, 2014 10:34 am

Nice try, when you edit the original post with pictures it'll get rid of the index image. :D

Did you modify the blowgun internals?
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Re: High Pressure Copper Coaxial .22 Pellet Gun

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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gun Freak » Sun Jan 05, 2014 5:53 pm

I like the thumbnail as it is xP

The blowgun is not modified at all!
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Dig_Gil » Thu Jan 30, 2014 4:32 pm

jackssmirkingrevenge wrote:
bravootome wrote:I noticed a large loose of power with my gun when the cold weather arrived.


Lower temperature equals lower pressure, simple as that - some gasses are more affected than others though.


I've read that compressed air guns aren't as much affected by temperature as other stored gasses. It seems to me that is an outside Vs Inside pressure issue.
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gippeto » Thu Jan 30, 2014 7:43 pm

"Gases" stored as liquids (butane, propane and CO2 being the most popular) are greatly affected (+/- pressure) by temperature...google vapor pressure for more info.

Gases stored AS gases are less affected. See "Boyles law of ideal gases".
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: sagthegreat » Thu Jan 30, 2014 9:27 pm

Gippeto wrote:Gases stored AS gases are less affected. See "Boyles law of ideal gases".




ahhhh... good old AP chemistry, the class where I sat there and drew designs for spudguns. Only if I listened, it would have actually helped me
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gun Freak » Tue Feb 04, 2014 8:29 am

sagthegreat wrote:good old AP chemistry, the class where I sat there and drew designs for spudguns


That was every class for me :D
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: bravootome » Tue Feb 04, 2014 2:23 pm

Gippeto wrote:"Gases" stored as liquids (butane, propane and CO2 being the most popular) are greatly affected (+/- pressure) by temperature...google vapor pressure for more info.

Gases stored AS gases are less affected. See "Boyles law of ideal gases".


Also air is very affected. I noticed on my qev. I got same nr. of shoots but the power is much much lower. Not sure if it's the mechanism involved but the cold temperature definitely makes the air not to expand so well......

jackssmirkingrevenge wrote:
bravootome wrote:I noticed a large loose of power with my gun when the cold weather arrived.


Lower temperature equals lower pressure, simple as that - some gasses are more affected than others though.


If the temperature is lower it doesnt mean the pressure is lower. i fill my gun with same 25 bar pressure in low temp. conditions. i guess they expand different. The effect appears is i fill the gun with 25 bar in a hot place and i put it out to a cold place. But i think the piston is affected by the cold temp. and it just freezes when i shoot..
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Last edited by jrrdw on Tue Feb 04, 2014 3:09 pm, edited 1 time in total.
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Re: High Pressure Copper Coaxial .22 Pellet Gun

Unread postAuthor: Gun Freak » Wed Feb 05, 2014 9:23 pm

But i think the piston is affected by the cold temp. and it just freezes when i shoot..


That seems much more probable than pressure differential.
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