Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 46 users online :: 4 registered, 0 hidden and 42 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

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.
Sponsored 
  • Author
    Message

Unread postAuthor: Petitlu » Tue Jan 17, 2012 12:43 pm

cut out the part that slides?

I would not have sealing ...




Image
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Brian the brain » Tue Jan 17, 2012 2:28 pm

Oh I see now.
You did not do it like in Al-xg's drawing.
  • 0

Gun Freak wrote:
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!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: Petitlu » Tue Jan 17, 2012 3:03 pm

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 :D
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: al-xg » Tue Jan 17, 2012 3:09 pm

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 :)
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: Petitlu » Tue Jan 17, 2012 3:16 pm

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


EDIT :

a seal more:

Image

Image
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Jan 18, 2012 1:16 am

Valveless FTW!

Great job, really glad to see this fleshed out :)

Also, I love the way you took the expression "hammer valve" so literally :D
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Petitlu » Wed Jan 18, 2012 1:57 am

thank you very much
:D 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.
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Petitlu » Wed Jan 18, 2012 3:29 pm

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

Loading:

Image

Ready to fire:

Image

After the fire:

Image

The PAC :
Image
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Brian the brain » Wed Jan 18, 2012 3:40 pm

Good idea!

Looks like this would work very well.
  • 0

Gun Freak wrote:
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!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: Petitlu » Wed Jan 18, 2012 3:48 pm

thank you
the breech is not very well done because I used a lime-iron ...
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Petitlu » Fri Jan 20, 2012 1:29 pm

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

For 40 or 60bar pressure in the PAC

Image
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Petitlu » Sat Jan 21, 2012 12:49 pm

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]http://www.youtube.com/watch?v=faPIxl03qLE[/youtube]
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Petitlu » Tue Jan 24, 2012 1:50 pm

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

Image

Image

Image
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

Unread postAuthor: Brian the brain » Tue Jan 24, 2012 2:19 pm

What a wonderful concept!

If you could replace the blowgun and the ballvalve for a single valve...it would be perfect!
  • 0

Gun Freak wrote:
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!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: Petitlu » Tue Jan 24, 2012 2:45 pm

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 ?
  • 0

User avatar
Petitlu
Brigadier General
Brigadier General
 
Posts: 807
Joined: Fri Jun 03, 2011 4:52 am
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'