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 68 users online :: 4 registered, 0 hidden and 64 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

Ball Valve Pneumatic

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

Ball Valve Pneumatic

Unread postAuthor: hascet » Mon Jul 19, 2010 10:54 am

This is the potato cannon I made:
4"x18" chamber
4" Cap
4"x2" reducer with 2"x1.5" bushing
1.5" ball valve
1.5" Barrel
Screw in schrader valve
Image
Image
Image
  • 0


hascet
Private
Private
 
Posts: 2
Joined: Mon Jul 19, 2010 10:38 am
Reputation: 0

Unread postAuthor: Gun Freak » Mon Jul 19, 2010 11:00 am

Only suggestion I have is to lengthen the barrel because you are using a BV. That giant BV must be a pain to open so I would stick like a 5 ft barrel on and you will get WAY better performance. Also, that reducer isn't rated for pressure, so stay around 70 psi max. Oh and also you should have screwed the schrader in where there is two layers, so be careful.
  • 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: clemsonguy1125 » Mon Jul 19, 2010 11:15 am

Defiantly lengthen the barrel, also you left you the extra pipe so just cut off the DWV reducer, and you taped the schrader into a single layer of pipe. Other than that its a decent first attempt
  • 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

Unread postAuthor: hascet » Mon Jul 19, 2010 11:30 am

Ya the barrel should be longer, do you think that I would get a lot more range out of a longer barrel? And as for the valve the threads weren't long enough to go through the cap and pvc. I think it should be ok because it has a shoulder on the inside.
  • 0


hascet
Private
Private
 
Posts: 2
Joined: Mon Jul 19, 2010 10:38 am
Reputation: 0

Unread postAuthor: clemsonguy1125 » Mon Jul 19, 2010 11:32 am

You will get a giant power increase, I would at least double the barrel length
  • 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

Unread postAuthor: Technician1002 » Mon Jul 19, 2010 12:08 pm

The reason the ball valve and a short barrel is a bad combination is the time required to open a ball valve by hand is too long. By the time the valve is partially open, the initial flow will eject the projectile out the short barrel before you get any real force on it, resulting in low power shots.

A faster valve ( some here use springs with good results ) or a longer barrel makes a big improvement. Having the projectile still in the barrel when the valve is fully open helps a lot. A longer barrel makes it possible.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'