High Pressure Copper Coaxial .22 Pellet Gun

[sagthegreat]

how did you calculate that?

[Gun Freak]

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.

[bravootome]

'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.

[mark.f]

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

Also, nice Schrader valve.

scrot-20140104-1388885747.jpg (33.13 KiB) Viewed 3782 times

EDIT: laughing now because my image shows next to the thread in the index. :blackeye:

[jackssmirkingrevenge]

HAHAHAHAHAHAHA!

I just saw the schrader valve in the thumbnail

Well played young man.

edit: ah mark if was you, there I was thinking Gun Freak had risen in the ranks

[Gun Freak]

@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...

[mark.f]

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

Did you modify the blowgun internals?

[Gun Freak]

I like the thumbnail as it is xP

The blowgun is not modified at all!

[Dig_Gil]

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.

[Gippeto]

"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".

[sagthegreat]

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

[Gun Freak]

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

That was every class for me

[bravootome]

"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......

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..

[Gun Freak]

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.