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 54 users online :: 4 registered, 0 hidden and 50 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

1/4 Brakeline Barrel and Copper Pellet gun

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
Sponsored 
  • Author
    Message

1/4 Brakeline Barrel and Copper Pellet gun

Unread postAuthor: clemsonguy1125 » Fri Mar 05, 2010 9:04 pm

I just bought a piece of 1/4 brake line as the barrel for my pellet gun. My problem is the 4.5 mm pellet/bb fits loosely and has a gap, will putting wadding behind the pellet yield decent power compared to a perfect sized barrel. Also at a 100psi is it possible to get decent power from a pellet in a piece of 1/2 inch copper pipe as the chamber. It will be a coax. I plan to use a blowgun to pilot it. Ill probably cast a epoxy piston.
  • 0

User avatar
clemsonguy1125
Major General
Major General
 
Posts: 1485
Joined: Tue Jul 21, 2009 4:00 pm
Location: East Coast
Reputation: 1

Unread postAuthor: Gun Freak » Fri Mar 05, 2010 9:31 pm

A .5 in. chamber and a .25 in. barrel on a co ax doesnt leave a big volume unless its really long. Also the wadding will definately help, you just need a ramrod.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: Hubb » Fri Mar 05, 2010 9:36 pm

Gun Freak wrote:A .5 in. chamber and a .25 in. barrel on a co ax doesnt leave a big volume unless its really long. Also the wadding will definately help, you just need a ramrod.
If you are going with such a small chamber volume, and are doing it in copper pipe, why are you limiting the pressure to only 100psi? GGDT will make a prediction for you, but I can just about bet that you will not be satisfied.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: MrCrowley » Fri Mar 05, 2010 9:47 pm

From experience, you wont be happy with the power. I wouldn't want to be shot by a BB at 100PSI from such a cannon, but power will seem pretty pathetic. You'll still shoot through a soda can though.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: clemsonguy1125 » Fri Mar 05, 2010 9:55 pm

MrCrowley wrote:From experience, you wont be happy with the power. I wouldn't want to be shot by a BB at 100PSI from such a cannon, but power will seem pretty pathetic. You'll still shoot through a soda can though.

Would a larger chamber volume increase power for a cannon on a coax this size.
And to Hubb
I am limited to 100 psi because I only have a cheap bike pump
  • 0

User avatar
clemsonguy1125
Major General
Major General
 
Posts: 1485
Joined: Tue Jul 21, 2009 4:00 pm
Location: East Coast
Reputation: 1

Unread postAuthor: Hubb » Fri Mar 05, 2010 10:54 pm

A larger chamber will, in fact, increase the power, as long as the barrel is of the right size. As far as your bike pump, consider an upgrade. :wink:
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: Crna Legija » Fri Mar 05, 2010 11:48 pm

make the chamber a bit smaller and get a shock pump, at 300 psi you want be disappointed at the power. make sure if you ram wad and ammo down that you stop it going into the chamber
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sat Mar 06, 2010 2:43 am

Hubb wrote:A larger chamber will, in fact, increase the power, as long as the barrel is of the right size. As far as your bike pump, consider an upgrade. :wink:


Couldn't agree more, the smaller you go with calibre the more you need to up the pressure to keep the power up. Remember that to have the same power potential as a 1/2" barrel at 100 psi, a 1/4" barrel needs 400 psi.

A shock pump is a cheap and useful source of 300-400 psi for a small chamber, and if you have access to proper epoxy making a small piston cannon should be no problem at all. You could very easily take this design and make it longer.
  • 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: clemsonguy1125 » Sat Mar 06, 2010 2:46 pm

jackssmirkingrevenge wrote:
Hubb wrote:A larger chamber will, in fact, increase the power, as long as the barrel is of the right size. As far as your bike pump, consider an upgrade. :wink:


Couldn't agree more, the smaller you go with calibre the more you need to up the pressure to keep the power up. Remember that to have the same power potential as a 1/2" barrel at 100 psi, a 1/4" barrel needs 400 psi.

A shock pump is a cheap and useful source of 300-400 psi for a small chamber, and if you have access to proper epoxy making a small piston cannon should be no problem at all. You could very easily take this design and make it longer.

I might see about upgrading to a shock pump and I my switch to a 1 inch chamber and a tee valve http://www.spudfiles.com/forums/high-pr ... 19694.html like this, because I dont want to deal with copper and I can screw all these parts together
  • 0

User avatar
clemsonguy1125
Major General
Major General
 
Posts: 1485
Joined: Tue Jul 21, 2009 4:00 pm
Location: East Coast
Reputation: 1

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'