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 62 users online :: 5 registered, 0 hidden and 57 guests


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

Registered users: Bing [Bot], farcticox1, Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Coaxial Paintball Grenade Launcher

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

Coaxial Paintball Grenade Launcher

Unread postAuthor: SP00K » Sat Jul 17, 2010 1:49 pm

So I have some 2" and 3" scrap pvc laying around. I realized that my paintball grenades fit perfectly inside 2" diameter pipe. So I just came up with a design for a m203 style grenade launcher.

My only question: Is 3" pipe going to be a large enough chamber for a 2" barrel considering it's coaxial? I'm only hoping to get about 100' or so of range. Should I bumb up to a 4" chamber?

This is going to be my first piston coax, so any tips are welcome.

EDIT: pressures of around 100 psi, and the grenades tend to weigh 2 lbs.
  • 0

Attachments
hfdhg.jpg
Diagram:
Light Blue: m203 style casing
Black: PVC
Orange: Shrader Valve
Green: Sprinkler Valve
Yellow: 90 degree brass fitting
Gray: Blowgun
Dark Red: Sealing Face
hfdhg.jpg (27.19 KiB) Viewed 1053 times
Last edited by SP00K on Sat Jul 17, 2010 9:46 pm, edited 1 time in total.
We are all worms, but I do believe I am a glow worm.

~Winston Churchill~
User avatar
SP00K
2nd Lieutenant
2nd Lieutenant
 
Posts: 212
Joined: Wed Dec 03, 2008 4:20 pm
Location: Ohiya
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Jul 17, 2010 1:52 pm

what pressures are you planning on running at, and how much does the PB grenade weigh?
  • 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: Gun Freak » Sat Jul 17, 2010 2:05 pm

Plug it in to GGDT and see. Or, do some simple math and determine the CB ratio, that should help a bit if you know the pressure you want to run at (which I presume is around the 100 psi range).
  • 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: jackssmirkingrevenge » Sat Jul 17, 2010 2:07 pm

With a 3" chamber and 2" barrel, C:B ratio should be around 1:1
  • 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: Gun Freak » Sat Jul 17, 2010 2:14 pm

Here are the results of a rough model in GGDT, rough because you didn't provide any details of what you planned to build other than barrel chamber and valve.
  • 0

Attachments
123.png
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 » Sat Jul 17, 2010 3:32 pm

Your gonna build a M203 style launcher using 3" pipe? Good luck with that...
  • 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: clemsonguy1125 » Sat Jul 17, 2010 3:42 pm

Make sure your barrel is perfectly centered and the barrel is perfectly flat on the end
  • 0

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

Sponsored

Sponsor
 


Unread postAuthor: Lockednloaded » Sat Jul 17, 2010 3:57 pm

To make an M203 look alike you are going to need a serious redesign. I think you should get a 3/4" QEV and a 3/4" galvanized steel chamber. Run this with your gun's CO2 system unregged through a high pressure slide valve. I have a sketch somewhere, I'll see if i can dig it up if you want
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Unread postAuthor: SP00K » Sat Jul 17, 2010 9:42 pm

Awh ballz. I did not mean an m203. I was thinking of a LAW.

Comparing pipe fittings at Home Depot, I decided to bump up to a 4" chamber.

I plan on running at pressures of around 100 psi, and the grenade weighs about 2 pounds (purdy heavy fer spud gun ammo).

I have a 3" end cap that slides up and down perfectly in a 4" chamber which I plan on using for a piston. The only problem is that it has a rounded end. Or is that not a problem? Because I can almost imagine that making a better seal, but I'm not sure what it will do to the piston and air filling actions.
  • 0

We are all worms, but I do believe I am a glow worm.

~Winston Churchill~
User avatar
SP00K
2nd Lieutenant
2nd Lieutenant
 
Posts: 212
Joined: Wed Dec 03, 2008 4:20 pm
Location: Ohiya
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Jul 18, 2010 12:16 am

Even with a 3" barrel it will have much more muzzle energy than a 9mm pistol bullet at 100 psi, I would not want that sort of projectile flying about while paintballing...
  • 0

Attachments
coaxlaw.GIF
coaxlaw.GIF (25.44 KiB) Viewed 954 times
coaxlaw3in.GIF
coaxlaw3in.GIF (25.73 KiB) Viewed 954 times
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: Hotwired » Sun Jul 18, 2010 1:36 am

SP00K wrote:the grenade weighs about 2 pounds


Sure you don't want to reconsider this?

That's a serious weight to be firing near people in a game where all other projectiles are very small and light.

2lb grenade vs a visor for example.
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: SP00K » Sun Jul 18, 2010 6:44 am

I completely understand your concerns about this. This is more of a for-fun-try-something-new thing.

I do not ever plan on using this in-game. I've had my share of near permanent loss and damage situations and I cannot imagine someone getting hit dead on in the chest (or god forbid, the eye) by accident. I set using this thing in game next to those kids who use combustion cannons in game next to those kids who use firecrackers with airsoft bb's in game.

No, this will never be amongst people.

Plus, nerf vortex footballs will be awesome :D and I've seen people use homemade rocket launchers in paintball for tanks.
  • 0

We are all worms, but I do believe I am a glow worm.

~Winston Churchill~
User avatar
SP00K
2nd Lieutenant
2nd Lieutenant
 
Posts: 212
Joined: Wed Dec 03, 2008 4:20 pm
Location: Ohiya
Reputation: 0

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], farcticox1, Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'