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 65 users online :: 4 registered, 0 hidden and 61 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

Simple Burst Disc Cannon (constest app??)

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

Simple Burst Disc Cannon (constest app??)

Unread postAuthor: PVC Arsenal 17 » Thu Aug 03, 2006 5:33 pm

Cannon name: P.B.D.C. (Pnuematic Burst Disc Cannon)
Barrel: 2 feet of 3/4" sch40
Chamber: 1 foot of 2" sch40
Union: 3/4" sch80 rated for 130 psi
Fill valve: Metal Schrader valve
Gas source: Compressor, Bike Pump, CO2 tire inflator
Primary Burst Discs: Punched out vinyl shower curtain liners
Primary ammo: Empty 12 gram cartridges.


Other parts include:

2"-3/4" bushing
2~2" couplings
2" plug

Last night at Lowes I saw that they had PVC unions so one in 3/4" and decided to build the simple burst disc. I will fire it tomorrow when the glue is all dried.

This gun is the definition of simple and cheap. For a beginner this is as simple to construct and fire as a basic combustion. Great gun to start out with.

Image

Image

Image[b]
  • 0

Last edited by PVC Arsenal 17 on Fri Aug 04, 2006 10:52 am, edited 4 times in total.

PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: SpudStuff » Thu Aug 03, 2006 5:36 pm

Yay Nice. I bet that cost you less than $10
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: PVC Arsenal 17 » Thu Aug 03, 2006 5:40 pm

Yeah, the union was the most expensive thing which cost me a whopping FOUR DOLLARS!!!

Cheap is the way to go.

I was going to send it to my cousins but they just got arrested for trying to set off a dry ice bomb in a construction site.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: SpudStuff » Thu Aug 03, 2006 6:01 pm

lol dumbasses the trick is not to get cought
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: PVC Arsenal 17 » Thu Aug 03, 2006 6:07 pm

Even worse than that was they waived they right to remain silent and confessed to the cops everything. They could have got a lawyer and made up some bullshit story of why they had dry ice and soda bottles on the construction site.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: SpudStuff » Thu Aug 03, 2006 6:53 pm

Lol even more of a dumbass. They should have said that used it to keep thier sodas cold.

Yes i know that would freeze them
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: frankrede » Thu Aug 03, 2006 8:23 pm

That is a very simple cannon. I am unfamiliar with burst disk cannons. So when the chamber reaches a certain psi it breaks the shower curtain and works in place of a valve?Nice cannon btw.
  • 0

User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Velocity » Thu Aug 03, 2006 8:35 pm

Burst disks cannons are suprisingly rare... and I am suprised.

They yield the best performance, and their only sacrifice is that they can sometimes fire randomly.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: carlbelcher » Thu Aug 03, 2006 8:44 pm

They yield the best performance


I don't completely agree with that statement, in burst disc cannons the "valve" (burst disc) opens almost instantaneously but it doesn't always open completely, a lot of times the disc only bursts open very slightly only letting the air escape though a small rip or hole.
  • 0

Is your Google.com Broken?!
User avatar
carlbelcher
Donating Member
Donating Member
 
Posts: 532
Joined: Mon Jun 12, 2006 6:54 pm
Reputation: 1

Unread postAuthor: M3NT4L » Fri Aug 04, 2006 12:35 am

I think it is posible to get rid of the random fires by placing a ball valve prior to burt disk section so that when you open it the hpa will begin flowing into the bust disk section and pop it. You would have to fill the chamber to a pressure that you know the disk will never withstand and then some because of all the dead space, and i dont think you will sacrifice much flow either, and if the ballvalve is one of the big pvc ones then i think that you would have quite a nice gun. And it might even be an economic gun if you shop smart.
  • 0

Image
User avatar
M3NT4L
2nd Lieutenant
2nd Lieutenant
 
Posts: 239
Joined: Wed Jul 05, 2006 7:40 pm
Reputation: 0

Unread postAuthor: frankrede » Fri Aug 04, 2006 12:55 am

Correct me if I am wrong, but wouldn't adding a ball valve defeat the purpose of having a burst disk?
  • 0

User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: boilingleadbath » Fri Aug 04, 2006 2:50 am

I would say so; the ball valve will only be slightly open by the time the burstdisk fails.

Acctualy, I know how to model this using the GGDT!
(skitters off)

The burstdisk will be exposed to full pressure within a few milliseconds of the balvalve starting to open;
Assuming the ballvalve takes .1 seconds to open fully, and the space between the 'disk and the valve (distance) it takes (time) for the disk to be subjected to nearly full pressure:
1" : 15 ms
5" : 20 ms
10" : 25ms
20" : 30ms

As you can see, even the largest "dead space" only allows one to open the valve 1/3rd of the way before the disk ruptures.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Fri Aug 04, 2006 10:39 am

Well I fired this gun for the first time this morning and I have to say I was really impressed! It lobs a 12 gram pretty far. I only used thin plastic for the first few tests but I'll move on to some thicker stuff later.

I am actually pretty happy I invested $10 into making this cannon. It's a fun little toy to mess with. Not as powerful as some of my others but it has potential with stronger burst discs.


Oh yeah... can I apply this in that contest??
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: killagorrila99 » Sun Aug 06, 2006 3:11 am

id say so. nice gun btw
i think ill build one
  • 0

"I'm sorry, Mr.Bush cant come to the phone right now, He's playing cleudo with Mr. Cheney And he has him in the Cupboard with a broom stick" -White house receptionist.
User avatar
killagorrila99
Brigadier General
Brigadier General
 
Posts: 1101
Joined: Tue Jul 25, 2006 2:35 am
Location: Australia.
Reputation: 0

Unread postAuthor: CS » Sun Aug 06, 2006 11:09 am

Read <a href="http://www.spudfiles.com/forums/viewtopic.php?t=2746&">THIS</a>.

Spudgun Build-Off! wrote:Threw all the moaning and growning, its here! This topic will be stickied and locked. If you would like to seek a answer or submit a cannon PM me by clicking the "PM" button at the bottom of this post. In your subject put "Spudgun Build-Off!". For a cannon being submitted to the contest use the same Subject title, and in the body of the document provide a link to the cannon and the name of the cannon. Before a cannon will be accepted this form below MUST be filled out:


Read people, read!
  • 0

User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'