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PAC WithOutLoss

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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Unread postAuthor: Petitlu » Sun Jan 15, 2012 3:01 pm

soon the firing system

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Unread postAuthor: Gun Freak » Sun Jan 15, 2012 3:06 pm

I'm liking the stock :)

Much better. I still wouldn't want to have my face near it :lol:
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Unread postAuthor: POLAND_SPUD » Sun Jan 15, 2012 3:08 pm

As he said, a leak on the pilot side of a QEV, or an airtight projectile combined with a leak on the front seal of a QDV can also trigger the shot.
Seriously ?? a leak will just vent to the atmosphere... I don't think this can trigger it... the only question is >> wouldn't it be a better idea to add a piston that does what ammo does right now ? If there was a valve he could use and ammo that fits the barrel
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Unread postAuthor: Petitlu » Sun Jan 15, 2012 3:13 pm

"J'ai encore ne voudrais pas que mon visage près qu'elle "

the breech is screwed so it is good!
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Unread postAuthor: Gun Freak » Sun Jan 15, 2012 3:15 pm

Mais je ne voudrais pas que mon visage près que 600 psi :lol:

As long as you feel safe with the construction, go for it! :P
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Unread postAuthor: Petitlu » Sun Jan 15, 2012 3:19 pm

ok
I understand you :wink:


PAC with my high pressure 3000psi on my face! :D
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Unread postAuthor: al-xg » Sun Jan 15, 2012 3:20 pm

A leak will just vent to the atmosphere,

Not with an airtight projectile... or as was mistakenly stated an airtight bolt on this valveless design.
Not much pressure is needed to move the projectile forward.

I'm pretty sure this has happened before, may have been on one of the french QDV launchers though.



Hehe, but then it wouldn't be valveless :D
He uses the same projectiles in his other copper barrelled canons. and in fact aren't those the ones you were saying would be good simple affordable drag stabilised projectiles ? ;)
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Unread postAuthor: Gun Freak » Sun Jan 15, 2012 3:30 pm

Petitlu wrote:PAC with my high pressure 3000psi on my face! :D

Je ne le ferai jamais :D
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Unread postAuthor: POLAND_SPUD » Sun Jan 15, 2012 11:02 pm

and in fact aren't those the ones you were saying would be good simple affordable drag stabilised projectiles ?
yup and I like them but I can't say I don't understand those who would like to be able to shoot just anything that fits in the barrel

Not with an airtight projectile... or as was mistakenly stated an airtight bolt on this valveless design.
Not much pressure is needed to move the projectile forward.
I still don't get it... air would have to leak out fast enough to create an area behind the projectile where pressure is > 10psi or so
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Unread postAuthor: Gun Freak » Sun Jan 15, 2012 11:05 pm

But if the projectile is airtight and the man's using 600 psi then it's not going to take long at all for 10 psi to collect behind the projectile.
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Unread postAuthor: Petitlu » Mon Jan 16, 2012 1:57 am

"
But if the projectile is airtight and the man's using 600 psi then it's not going to take long at all for 10 psi to collect behind the projectile."


not because behind the projectile is not sealed so the air to the atmosphere from

No pressure rise ...
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Unread postAuthor: Gun Freak » Mon Jan 16, 2012 10:25 am

Don't worry Petitlu, it doesn't apply here since your ammo is your valve.
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Unread postAuthor: Brian the brain » Tue Jan 17, 2012 12:13 pm

But if the bolt leaks you will get some loss.

So...

How about this idea:
Use the firingpin as the safety.

In cocked position it should leak, when released it should be as airtight as possible.

You could do this by having it all fit REALLY snug to avoid unnessecary losses ...then file the portion that travels in the bolt down so when cocked there is an open airchannel.

This could be done without any other changes.
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Petitlu » Tue Jan 17, 2012 12:23 pm

sorry but I do not understand ... :(
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Unread postAuthor: Brian the brain » Tue Jan 17, 2012 12:38 pm

projectiles=good
launcher= very good!




For safety reasons with 100% seal : change the bolt.

Cut out a section, see picture.

Maybe ask Al-xg for translation.
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