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PAC 120 Bar - 1700 PSI

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 » Fri Sep 16, 2011 6:15 am

For a ball of 40 grams and 120 bar:

Speed: 231m/s
Energy : 1070 J

results obtained with GGDT
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Unread postAuthor: MrCrowley » Fri Sep 16, 2011 6:22 am

jackssmirkingrevenge wrote:...says the guy with the hand-held hybrid that generates higher pressures of hot gas :roll:

If only it were half as nice looking, I'd get all the french girls :D
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Unread postAuthor: Petitlu » Fri Sep 16, 2011 9:10 am

I'm glad you like my PAC, it's good
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Unread postAuthor: POLAND_SPUD » Fri Sep 16, 2011 1:08 pm

Another proof that europe rocks
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Unread postAuthor: Petitlu » Fri Sep 16, 2011 1:29 pm

Yes in France we make of the powerful!
I am making a BBMG under 200 bar !
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Unread postAuthor: Moonbogg » Fri Sep 16, 2011 2:33 pm

Thats a nice piece of kit, as the europeans say.
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Unread postAuthor: Petitlu » Fri Sep 16, 2011 2:41 pm

Thank you your realizations are really magnificent!
I am impressed, bravo

EDIT: kit? The conception and the plans are of me...
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Unread postAuthor: Zeus » Fri Sep 16, 2011 7:39 pm

Petitlu wrote:Thank you your realizations are really magnificent!
I am impressed, bravo

EDIT: kit? The conception and the plans are of me...


"A nice piece of kit" is a proverbial statement. Like "a nice piece of equipment".

Excellent work too, I like seeing high pressures used.
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/sarcasm, /hyperbole
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Unread postAuthor: warhead052 » Fri Sep 16, 2011 7:46 pm

Nice job! Any chance of a diagram? I don't understand the burst disk part, but other wise everything else looks great!
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Unread postAuthor: Technician1002 » Sat Sep 17, 2011 1:34 am

Am I the only one who thinks adding the projectile after the air is a bad idea?

Safety for my launchers is to add the projectile when it can't possibly fire, then add air and shoot.
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 17, 2011 1:48 am

Technician1002 wrote:Am I the only one who thinks adding the projectile after the air is a bad idea?


Both options have their risks, what if you have a misfire while filling? In this case the burst disk is backed up by a ball valve so it's not so critical in my opinion.

Saw the videos in the meantime, that thing kicks like a shotgun! Good stuff :)
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Unread postAuthor: Petitlu » Sat Sep 17, 2011 2:53 am

The day of the shooting I was incited enough and I badly reloaded I recognize it.
Now I am like that going to make: to put the disk of break then the bullet and the pressure. I thank you for your encouragements
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Unread postAuthor: POLAND_SPUD » Sat Sep 17, 2011 4:43 am

For a ball of 40 grams and 120 bar:

Speed: 231m/s
Energy : 1070 J

results obtained with GGDT

I think that the real performance is slightly lower than this as the burst disk bursts before the ball valve completelly opens


Not that I think it isn't a cool gun - It's great
I am just trying to make a point why there aren't too many high pressure guns (1000+ psi)

The performance of this gun could be achieved with a 7-9X hybrid and ~800-1000 psi max chamber pressure

It simply is not practical to build high pressure pneumatic guns - the increase in the price of materials & difficulty to get them is a lot higher than the performace increase you get
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 17, 2011 5:27 am

POLAND_SPUD wrote:Not that I think it isn't a cool gun - It's great
I am just trying to make a point why there aren't too many high pressure guns (1000+ psi)


I couldn't agree more, this is a great creation but if you want a high performance single shot launcher hybrids are definitely the way to go.
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Unread postAuthor: Petitlu » Sat Sep 17, 2011 7:01 am

I think that you should not mix everything and that it is necessary to compare the weapons of the same category: PAC with PAC, hybrid with hybrid
If I change the reservoir I can fire in 300 bar (4500psi) but at the moment I am going to put in it a standard lined in calibre 45
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