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


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

co2 gun.

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

co2 gun.

Unread postAuthor: JJ pyro » Mon Nov 05, 2007 12:01 pm

I have a theory about a (new) type of gun,

i had a idea about a gun that fires 8g co2 cartridges. its a simple gun that had a toy revolver on the back of the barrel and a breech loading. the toy revolver has a needle on the ting that moves forward and makes the little tings explode. the needle pieces the back of the co2 cartrides and the cartrides are fired out of the barrel from the pressure that was releast.

will this work.

greetings from holland
  • 0


JJ pyro
Private First Class
Private First Class
 
Posts: 38
Joined: Tue Aug 21, 2007 6:21 am
Reputation: 0

Unread postAuthor: CpTn_lAw » Mon Nov 05, 2007 12:05 pm

well, i guess if i could understand everything in your post that could help a little :)
If i got it right, you want to fire little CO2 cartridges by sticking 'em into a barrel, with a percusion pin behind, and rupting the back of it is it right?
in that case, yeah, it would work, but careful when doing that mate, you need a consistent wall thickness for your barrel, and forget about PVC....
  • 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

Unread postAuthor: JJ pyro » Mon Nov 05, 2007 12:08 pm

i was planning to make it from copper is that stong enough?
  • 0


JJ pyro
Private First Class
Private First Class
 
Posts: 38
Joined: Tue Aug 21, 2007 6:21 am
Reputation: 0

Unread postAuthor: CpTn_lAw » Mon Nov 05, 2007 12:58 pm

i suggest you make it out of two copper pipes sleeved one in the other, to add extra weight and strength. Your percusion pin should be in a very small pipe with very strong spring and a "anti-return" mecanism. (As the pressure builds up fast, you don't want the pin to go backwards like a projectile. I had a pressure gauge pop out to my chest, and man that big bruise last 3 weeks)
  • 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

Unread postAuthor: Ragnarok » Mon Nov 05, 2007 1:35 pm

Hmm, I don't know about Dutch law, but a design like that might qualify as a full firearm - it certainly would in the UK.

You'll need at least copper, and a toy revolver isn't even going to start to cut it in terms of what you'd need to pierce the cartridge base. If you're hitting a free moving 8g bulb, then a pneumatic ram is a minimum, otherwise you'll either do nothing, or just flick the bulb out of the barrel without piercing it.

Either that or you need an impact explosive on the rear of the bulbs to blast them open, but that's ill advised, and shouldn't be done.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: ALIHISGREAT » Mon Nov 05, 2007 2:31 pm

hmm it sounds like an intersting project, i think you would be better making a regular pnuematic using co2 to fill the chamber, this thread shows you how to work out how many oz of co2 you need http://www.spudfiles.com/forums/viewtopic,p,131065.html#131065 to fill you chamber.
  • 0

User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: Necrosis » Mon Nov 05, 2007 3:13 pm

I have the feeling that he wants to shoot the co2 capsules like rockets....

like a bazooka.. but.. different..
  • 0

User avatar
Necrosis
2nd Lieutenant
2nd Lieutenant
 
Posts: 239
Joined: Tue Jul 03, 2007 10:03 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: ALIHISGREAT » Mon Nov 05, 2007 3:21 pm

yes but it think he will get better performance from using a more convential setup...
  • 0

User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: f.c » Mon Nov 05, 2007 4:09 pm

agreed ive shot normal co2 cannisters for a school project there performance is lousy and un-predictable at best.
  • 0

can i be a sasquatch ?
User avatar
f.c
Captain
Captain
 
Posts: 340
Joined: Sun Jul 08, 2007 2:40 am
Reputation: 0

Unread postAuthor: JJ pyro » Tue Nov 06, 2007 4:08 am

yes my iddea was to shoot co2 capsules like rockets in a copper pipe with a kind of firenig mechanisem

sorry for the bad english i am a 13 year old boy from holland.
  • 0


JJ pyro
Private First Class
Private First Class
 
Posts: 38
Joined: Tue Aug 21, 2007 6:21 am
Reputation: 0

Unread postAuthor: JJ pyro » Tue Nov 06, 2007 4:15 am

and my idea was to make a kind of M1 garand with a magazine on the top of the gun. if it works good i have a nice semi rifle or a old bolt actoin rifle.
  • 0


JJ pyro
Private First Class
Private First Class
 
Posts: 38
Joined: Tue Aug 21, 2007 6:21 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Nov 06, 2007 4:27 am

I doubt you'll get good performance as the hole in the nozzle will be too small, you'll need a long tight fitting barrel for a reasonable velocity. Also, you have to consider adding some sort of tail or fins for each capsule as it will begin to tumble as soon as it leaves the barrel.

Launchers for CO2 dragsters like this one typically use spring-loaded firing pins to break the seal so you'll have to make a similar mechanism. The concept would be similar to the German WW2 Puppchen launcher which I described here
  • 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: JJ pyro » Tue Nov 06, 2007 4:38 am

i have bougth a copper pipe wich presicly is lage enogth for a 8g co2 capsul. and i think i am using a spring bb gun to pirce the co2 capsul. but wil this fire hard or wil it have a realy bad preformanse?
  • 0


JJ pyro
Private First Class
Private First Class
 
Posts: 38
Joined: Tue Aug 21, 2007 6:21 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Nov 06, 2007 4:50 am

The cartridge is heavy and the nozzle is small, however what you do have on your side is that the CO2 is at very high pressure. In a long barrel - I'm thinking at least a metre and a half in length - you would probably get a decent velocity, but again without any sort of fins accuracy would suffer.
  • 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: RDX, » Thu Nov 08, 2007 1:42 pm

I have made gun that shotted 12g co2 capsules... and when i shot the capsule it went only about 10 meters ,the main problem was that the co2 inside the capsule freezed when it was shotted,and when co2 is cold the pressure drops very much. sorry my bad english :D

and this cannon was made with lathe and the barrel was hydraulic steel pipe .so you cant blame the gun :wink:

long barrel and hot weather would help
  • 0

User avatar
RDX,
Corporal
Corporal
 
Posts: 77
Joined: Sat Mar 31, 2007 2:16 pm
Location: Finland
Reputation: 0

Next

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot]

Reputation System ©'