PAC WithOutLoss

[Petitlu]

cut out the part that slides?

I would not have sealing ...

[Brian the brain]

Oh I see now.
You did not do it like in Al-xg's drawing.

[Petitlu]

not as Al-xg!
For cons I'll change the breech so that it does not back
I add as a side breech gasket / projectile for safety

I plan to make a shot at 60bar, 870psi

[al-xg]

Edit: too slow to psot it seems.

Petitlu's bolt is solid, the whole thing knocks the projectile forward. The bolt isn't sealed as such, but the ID of 14mm copper is about 12.6mm so you still wouldn't want a big leak.

There is however a redundant O-ring on each side of the projectile which helps the odds. But then again the most likely source of damage would be a projectile with a sharp but that would probably affect both O-rings.


To be on the safe side one could just put a ball valve on the barrel, that should be pretty effective...




Ah trop lent. Je ne fais que me repeter, mais en anglais

[Petitlu]

Al-xg thank you!
a ball valve on the gun, why not, it's a very good idea


EDIT :

a seal more:

[jackssmirkingrevenge]

Valveless FTW!

Great job, really glad to see this fleshed out

Also, I love the way you took the expression "hammer valve" so literally

[Petitlu]

thank you very much
for the "hammer valve!" I had not thought of!

I feed the PAC account with a bottle of paintball (preset to 435 or 870psi) and under the gun to the gun disassembled for transport.

[Petitlu]

I made a bolt for the CAP, so that it locks in case of fall of the hammer is blocked

Loading:



Ready to fire:



After the fire:



The PAC :

[Brian the brain]

Good idea!

Looks like this would work very well.

[Petitlu]

thank you
the breech is not very well done because I used a lime-iron ...

[Petitlu]

Well tomorrow I'm shooting a radio controlled with the PAC!

For 40 or 60bar pressure in the PAC

[Petitlu]

I had a shot this afternoon, but little shooting 10bar remote!

I changed the cylinder head gaskets side, I put 3 instead of 2 and it is not good because I had a leak, that's why I could not get up to 40bar shoot.

As against this leak clearly shows that there is a problem sealing side bolt shooting can not leave it alone!

[youtube][/youtube]

[Petitlu]

Here is the new configuration of the CAP WithOutLoss (no loss):

it is finally almost finished shooting system, I get the pressure of the room and I inject it in the ass of the projectile as it no problem to move forward (the hammer end) until the seal is broken and he rushes into the barrel. Again no loss of air.

For safety I have a small valve when filling if there is a leak next to the cylinder head is removed via the open valve preventing the rise of pressure and the projectile

[Brian the brain]

What a wonderful concept!

If you could replace the blowgun and the ballvalve for a single valve...it would be perfect!

[Petitlu]

thank you!

there should be a pneumatic valve 3 / 2 ...
But I'm happy with my concept, it allows effortless shooting whatever the pressure.

I intend to do a shot at 870psi

You will be a PAC on this system ?