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 57 users online :: 7 registered, 0 hidden and 50 guests


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

Registered users: Baldyforks, Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Where should the burst-disk be?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 

Where should the union burst-disk setup be?

behind ammo (BBs)
4
80%
after ammo (BBs)
1
20%
 
Total votes : 5
  • Author
    Message

Where should the burst-disk be?

Unread postAuthor: Marffy » Thu Jan 21, 2010 11:45 pm

I'm in the making of a paintball/airsoft bazooka. the gun uses a ball valve and as we all know ball valves are no good unless you have a HUGE chamber size. Since it has a ball valve i'll be using a union and burst-disk setup after the valve. I'm wondering where the union for the gun should be. Should it be before the ammo or after the ammo? I know for paintballs that the union has to be after the union. But, some airsoft nades (davidvani) have the bbs behind the burst disk. I just want to know what will get me a better performance.
  • 0

"Hard work has a future pay-off. Laziness pays off now."
User avatar
Marffy
1st Lieutenant
1st Lieutenant
 
Posts: 258
Joined: Mon Jul 27, 2009 2:03 pm
Location: earth
Reputation: 0

Unread postAuthor: irisher » Thu Jan 21, 2010 11:47 pm

the union has to be after the union.
I'm not sure I follow.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: deathbyDWV » Fri Jan 22, 2010 12:39 am

I would say bbs in front of union. That way your wadding doesn't have to go through the (normally reduced inside of the) union. Although you could just dremel it out... It could still have issues...

I don't think either way would have any noticable increase in power. The only power gain you would have if bbs were behind burst disk would be the 2-3 more inches of barrel.

I think david's are behind the disk because most of the time he doesn't use any other barrel except for what is behind the disk.
  • 0

User avatar
deathbyDWV
Colonel
Colonel
 
Posts: 576
Joined: Sat May 16, 2009 4:02 pm
Location: Owasso, OK
Reputation: 2

Unread postAuthor: theBOOM » Fri Jan 22, 2010 1:02 am

It goes chamber, connection from chamber to union, union, threaded barrel, and then the bb lies on the disc or some mms away from it. (Infront of the union)
  • 0

User avatar
theBOOM
Major
Major
 
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX
Reputation: 0

Unread postAuthor: deathbyDWV » Fri Jan 22, 2010 1:13 am

But he plans to use a ball valve as a trigger to the disk...

like this-

Chamber>ballvalve>burstdisk>barrel


His question is whether the ammo should go-

Chamber>ballvalve>ammohere>burstdisk>barrel

Or-

Chamber>ballvalve>burstdisk>ammohere>barrel
  • 0

User avatar
deathbyDWV
Colonel
Colonel
 
Posts: 576
Joined: Sat May 16, 2009 4:02 pm
Location: Owasso, OK
Reputation: 2

Unread postAuthor: theBOOM » Fri Jan 22, 2010 1:20 am

It goes chamber>ballvalve>coupling to the union>ammo>barrel.
  • 0

User avatar
theBOOM
Major
Major
 
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX
Reputation: 0

Unread postAuthor: Lentamentalisk » Fri Jan 22, 2010 4:32 am

David's were the other way around because they were designed as cartridges, and he was taking advantage of the tape not only to hold pressure, but to hold the BBs in in transit. Since BBs are far smaller than the size of the barrel, they won't have any trouble with traveling through the union, but a more tight fitting projectile could get caught up, and end up ripping off your barrel.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: CpTn_lAw » Fri Jan 22, 2010 6:48 am

I'd precognize you go easy on pressure at first. I made a cannon like yours, even with a small chamber and 100 psi, it was nothing compared to just the ball-vave. Be very careful . And yes
Chamber -> ball-valve -> union + burst dic -> ammo in barrel.
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Baldyforks, Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'