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 48 users online :: 4 registered, 0 hidden and 44 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

Semi auto, with 2 blowguns

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

Semi auto, with 2 blowguns

Unread postAuthor: )DEMON( » Tue Mar 27, 2007 5:12 pm

The idea is simple. Attach two blowguns to either side of a small chamber and then connect them so when one is closed the other is open.

They seal the best from the back, I took that into account and made it so they except all the pressure from the back.

Now a barrel is connected to one, this one is the main valve. When it is closed the other is open, thus filling the chamber. Now when you open the main valve to fire your bb the fill valve closes, making sure no air is wasted. Then you close the main valve and the cycle repeats. Oviously you need a feed of bb's.

Here's a pic.

The perfect plinker.
  • 0

Attachments
blowgun semi auto.JPG
blowgun semi auto.JPG (15.99 KiB) Viewed 622 times
Forever dreaming...
User avatar
)DEMON(
Major General
Major General
 
Posts: 1391
Joined: Sun Mar 12, 2006 1:22 pm
Location: Johannesburg South Africa
Reputation: 0

Unread postAuthor: singularity » Tue Mar 27, 2007 5:26 pm

looks like it will work but its gonna be a little bulky, it would probably be better if you replaced the 2 blowguns with 2 linked barrel sealing tee valves or something. but of course tats gonna be more work
  • 0

be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
User avatar
singularity
Brigadier General
Brigadier General
 
Posts: 982
Joined: Mon Jun 26, 2006 10:53 pm
Location: someplace
Reputation: 0

Unread postAuthor: frankrede » Tue Mar 27, 2007 5:53 pm

Why do people keep recommending piston valves for guns that have a limited air supply?

It defeats the purpose of having multiple shots when a valve is too powerful for the job at hand.
Its like using a jackhammer to engrave your name on some wood.
  • 0

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

Unread postAuthor: A-98 » Tue Mar 27, 2007 5:57 pm

frankrede wrote:Its like using a jackhammer to engrave your name on some wood.

nice analogy frank.

it looks like it would work also, flow wouldnt be great, so no amazing projectile speeds
  • 0

There are rules, and then there are hundred dollar bills.
User avatar
A-98
Brigadier General
Brigadier General
 
Posts: 921
Joined: Thu Apr 27, 2006 7:41 pm
Location: Santa Barbara, CA
Reputation: 0

Unread postAuthor: Hawkeye » Tue Mar 27, 2007 6:23 pm

You can do many things to tone down a piston valve and make it stingier on air expenditure. Far more I would venture than having a valve that depends on your reaction time to meter out air.
Why not try for multiple higher power shots? If you can release a small amount of higher pressure air rapidly and reset a piston valve and shoot again, why not?
  • 0


Hawkeye
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm
Reputation: 0

Unread postAuthor: Solo » Fri Apr 06, 2007 11:24 am

Hawkeye, see my thread here for an application of that exact idea.
http://www.spudfiles.com/forums/viewtopic.php?t=7204&
  • 0

User avatar
Solo
Private First Class
Private First Class
 
Posts: 33
Joined: Fri Jan 05, 2007 10:45 am
Reputation: 0

Unread postAuthor: Hawkeye » Fri Apr 06, 2007 11:42 am

Yes that works. The misconception people have is that venting the pilot volume allows air from the refill chamber to vent needlessly but you can set it up so that the piston moving back holds a valve shut to eliminate this problem. As the spring resets the piston it also relieves the pressure holding the other valve shut and allows the FE chamber to refill the firing chamber.
  • 0


Hawkeye
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Solo » Fri Apr 06, 2007 11:56 am

Oh, I see. You are talking about a gun with two reservoirs! The FE would be dumping into the rest of the gun through a valve in the pilot volume. Hmm, yea, you would need a valve to close off the FE during the firing cycle in that case. My idea just had the FE as the primary chamber like on a conventional o/u pneumo.
  • 0

User avatar
Solo
Private First Class
Private First Class
 
Posts: 33
Joined: Fri Jan 05, 2007 10:45 am
Reputation: 0

Unread postAuthor: Hawkeye » Fri Apr 06, 2007 12:14 pm

Yes, The firing chamber doesn't need to be very large to shoot smaller projectiles and you can operate at a very high pressure.
  • 0


Hawkeye
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'