SpudFiles

I saw a copper airgun on the net that was stunning and I would like to find it again.

Description:

The gun used a commercial QEV.

Barrel over chamber design.

The barrel was not permanently attached to the chamber.

He cut the ID of copper T's and slid the barrel through the T's.

The T's were opened up on their sides so you could see the barrel going though them.

The T's fit onto the barrel by sliding them onto tubing affixed to the chamber.

The copper was not soldered, instead he use "just for copper" glue.

Highly polished gun.

A contest winner.

If I remember correctly, I saw it on the UK forum.

Do you know this gun?

I have spent hours looking.

BoyntonStu

i think it hotwired cannon it called copperhead prime
http://www.spudfiles.com/forums/viewtopic.php?t=6013&

no no i knew immediately what he was talking about and this is it http://www.spudfiles.com/forums/copperh ... ter,0.html i hope lol edit: dang you twizi you changed your comment lol

i new it but i had forgot the name it was a very sweet gun

Thanks guys, this forum is great!

What is so interesting is that in just a few words, I could describe and you could recognize a single gun out of many.

Here it is:

http://www.uksgc.co.uk/forums/index.php ... Copperhead

She is a beautiful form an function design.

I wonder what its performance is.

BTW What pressure can a QEV diaphragm survive?

Thanks again,

Boyntonstu

600psi plus piston ones can digrams can survive 400psi maybe

Piston QEV's can hold over 600 PSI, diaPHRAM QEVs might be able to hold 400 PSI.

Twizi, please stop changing your posts like that. Btb used unregged (around 800 psi) in one once.

Wow.

The first two users to reply with the answer hadn't even joined the forum when my cannons thread last saw the light of day


As for performance, well that was slightly secondary to other things it had to do but it still has a predicted range of about 450m at the 240psi I have available (as if anyone is going to see a 14mm projectile come down that far away ^^) and can do terrible things to anything much you put in the way with very respectable sound effects. Big enough to be fun, small enough to live in the wardrobe


Unregulated co2 has been used by one of our French members too, I think his QEV piston blew apart under pressure when it was poked by the barrel. The metal casing was fine but the rubbery piston was under too much stress.


I've just noticed that (yet again) one of the cannon pictures has died, swear it was the same one whose hosting failed last time. I'll have to find the originals and rehost it.

Beautiful guns get remembered mate

boyntonstu wrote:What is so interesting is that in just a few words, I could describe and you could recognize a single gun out of many.

To be honest, it could probably have been worked out from one line amongst those:

He cut the ID of copper T's and slid the barrel through the T's.

It's not a common thing on cannons - so with the JFC comment (also uncommon), it'd be pretty much certain.

Yep 850psi regulated High Pressure Air, and yes that is getting a little close to the limit for a 3/4" rubber QEV piston. After the bit of copper pipe got caught in the seat It leaked a bit of air, so although it shouldnt fail on its own, when using 850psi its probably worth being safe and using a stronger piston.

A metal piston could counter that problem, or one could just go with a smaller QEV.

And I'm not French, but yeah I've lived in France for quite while