Login    Register
User Information
We are a free and open
community, all are welcome.
Click here to Register
Who is online

In total there are 77 users online :: 3 registered, 0 hidden and 74 guests

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

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

The Team
Global Moderators
global_moderators.png CS

Coaxial Piston Cannon

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
  • Author

Coaxial Piston Cannon

Unread postAuthor: TheLost » Thu Apr 23, 2015 6:30 pm

Ok guys, Lost is at it again, but this time, with a coaxial piston design.

Here's what I'm thinking.

3'x3" chamber, with a 3'x2" barrel running down the center, with a coaxial piston at the back.

The valve to be used to open this coaxial piston will be a RainBird 1" sprinkler valve modified to pneumatic activation, via a standard compressor air gun.

The only question I have is an idea regarding faster followup shots from refilling the tank faster, though the projectile will still be muzzle loaded. The "faster follow up" comes from NOT having to connect the chamber to an air compressor after every shot. I had this crazy idea regarding 12/16g C02 cartridges that you all may find interesting. Basically, have six positioned radially around the chamber, and using them to refill the chamber by simply opening their valve into the chamber. I have guestimated that 3 12/16g tanks would be needed to fill the tank to ~50 psi, and 6 to get anywhere close to ~100psi.

So basically, the chamber could be filled via air compressor via ball valve with compressor QD, bike pump on a schraeder valve, or a couple 12/16g CO2 cartridges via Red Zeppelin fill ports.

What do you all think?

Worth it? Would it work? How many 12/16g tanks would I need to achieve certain pressures? (The chamber in in^3 is ~520in^3) Or am I insane?
  • 0

Posts: 8
Joined: Fri May 23, 2014 6:00 pm
Country: United States (us)
Reputation: 0

Re: Coaxial Piston Cannon

Unread postAuthor: dart guy » Thu Apr 23, 2015 8:31 pm

I think you created a very expensive air compressor.
  • 0

when life gives you lemons... make root beer and leave the world wondering how you did that :D
User avatar
dart guy
Posts: 397
Joined: Mon May 13, 2013 7:54 pm
Location: not telling you
Reputation: 5

Re: Coaxial Piston Cannon

Unread postAuthor: Gippeto » Sat Apr 25, 2015 10:12 am

When you reduce the pressure of a gas, there is a cooling effect on that gas..(the greater the differential or speed, the greater the effect).which would be transferred to the pvc. Cold pvc and pressure is something which I suggest you avoid as plastics become increasingly brittle when cold.

Sounds like a reasonably well thought out piece...build it and enjoy it for what it is....without the co2.

Punching holes in stuff is fun....punching bloody BIG holes is SOoooo much MORE fun! 8)

That's my .02 at any rate....take it as you will. :)
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Donating Member
Donating Member
Posts: 2391
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'