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 66 users online :: 5 registered, 0 hidden and 61 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Dual Valve Cannon

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

Dual Valve Cannon

Unread postAuthor: kiwi of nitro » Thu May 21, 2009 8:11 pm

It's triggered by a safety pop-up valve set to 165psi, pulling the trigger releases the air in both pilots FAST. It's really powerful and works great, plus the camo scheme looks awesome. I used krylon fusion.

Here's some pics, please tell me what you think.

Image

Image

Barrel isn't attached in pics.

This went together really fast too, I got it all done in an afternoon.
  • 0

User avatar
kiwi of nitro
Corporal
Corporal
 
Posts: 77
Joined: Sun Aug 31, 2008 9:42 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu May 21, 2009 11:49 pm

Nicely done, I abhor the dead space but performance must be nonetheless impressive, los damage peectoors por favor :)
  • 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: Cosmic Muffin » Fri May 22, 2009 5:03 am

slight waste of a valve. because the there is not an equal distance from the valves to the barrel. you should have just kept the one on top :?
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: Mitchza89 » Fri May 22, 2009 8:53 am

Very clean job and a cool looking gun mate :) I think you should have two barrels going, it would be like grampa's good ol' dual barrel shot gun :D
  • 0

Image
User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

2 small vs 1 large vavle

Unread postAuthor: Technician1002 » Fri May 22, 2009 12:06 pm

Cosmic Muffin wrote:slight waste of a valve. because the there is not an equal distance from the valves to the barrel. you should have just kept the one on top :?


The 2 small valves do not make up for a single large valve in both flow and dead space.

If you double the size of 1 valve the area increases 4X. A single 1.5 inch valve may outperform two 1 inch valves in flow and will be much better in regards to dead space. (space between the valve and projectile)

As for ergonomics, unique trigger, and overall layout I like it a lot. Nice job. It looks fantastic and must be a blast to use. :D
  • 0

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

Unread postAuthor: Ragnarok » Fri May 22, 2009 12:41 pm

Cosmic Muffin wrote:...Because the there is not an equal distance from the valves to the barrel...

Pretty irrelevant. The second valve will still improve flow.

I would've said the order you put this cannon together in was a little awkward and unintuitive, but you clearly put thought into it in advance, so good job on that one, many people would have fallen into doing it in a way that left them stuck.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: AdiabaticManiak » Fri May 22, 2009 3:11 pm

Nice gun you've build there!

I'm in the opinion that twice the valve; twice the fun. No matter thinking about the percentage of improvement; just the feeling of a dual valve setup in your hands make it worth it; am I right?

But please show us the full setup with barrel and such; would be fun to see.
  • 0

User avatar
AdiabaticManiak
Private First Class
Private First Class
 
Posts: 27
Joined: Fri Mar 13, 2009 2:27 pm
Location: Germany, Magdeburg
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: mister pointy » Fri May 22, 2009 3:46 pm

Nice job, the trigger is pretty intuitive and the paint job looks good as well.
  • 0

User avatar
mister pointy
Private First Class
Private First Class
 
Posts: 38
Joined: Thu Jun 19, 2008 8:37 pm
Reputation: 0

Unread postAuthor: kiwi of nitro » Fri May 22, 2009 10:27 pm

I tried my best to minimize dead-space, but this is the very best I could do (I've seen many launchers with a whole lot more dead-space). It is far louder and has much more kick than any of my single valve launchers. Having a little more space between one of the valves and the barrel won't have any effect because both valves are connected to the same air chamber. Everything had to be cut real precise in order to fit the parts together, but it worked flawlessly.
Image
  • 0

User avatar
kiwi of nitro
Corporal
Corporal
 
Posts: 77
Joined: Sun Aug 31, 2008 9:42 pm
Reputation: 0

Unread postAuthor: ssgnort » Fri May 22, 2009 11:12 pm

So could the same trigger set up be used to fire off nine piston valves. For a single trigger in a nine tube mlrs.
  • 0


ssgnort
Private
Private
 
Posts: 24
Joined: Sun Jan 25, 2009 12:19 am
Reputation: 0

Unread postAuthor: kiwi of nitro » Fri May 22, 2009 11:20 pm

NINE PISTON VALVES?! That's insane! Just make one great big one!
  • 0

User avatar
kiwi of nitro
Corporal
Corporal
 
Posts: 77
Joined: Sun Aug 31, 2008 9:42 pm
Reputation: 0

Unread postAuthor: Technician1002 » Fri May 22, 2009 11:32 pm

ssgnort wrote:So could the same trigger set up be used to fire off nine piston valves. For a single trigger in a nine tube mlrs.


It would be very difficult to get them to all fire together. As a few pop open the pilot area would see a rising pressure that may slow the others until the outlet pressure rises to compensate so you would most likely see a rapid sequence instead of a single unified opening.

The dead space could be a problem. I would go for a single larger valve myself. Plans are on the drawing table for a 3 inch and 4 inch valved cannon.

Note a 1 inch valve has an area of 0.785 square inches. 10 of them would be 7.85 square inches.

A single 3 inch valve is a little over 7 square inches with much less dead space and higher efficiency (less drag) that the extra plumbing would provide. A single 3 inch valve will outperform 10 1 inch valves.
  • 0

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

Unread postAuthor: kiwi of nitro » Sun Oct 11, 2009 4:33 pm

I've found a use for this cannon!
[youtube]http://www.youtube.com/watch?v=Zc006HN3-6I[/youtube]
Very handy!
  • 0

Last edited by kiwi of nitro on Mon Oct 12, 2009 10:45 pm, edited 1 time in total.
User avatar
kiwi of nitro
Corporal
Corporal
 
Posts: 77
Joined: Sun Aug 31, 2008 9:42 pm
Reputation: 0

Unread postAuthor: Reactor4 » Mon Oct 12, 2009 9:36 pm

Plans are on the drawing table for a 3 inch and 4 inch valved cannon.


Verrrry Nice! how big are you going to make the chamber? any design details e.g. paint job? I have been using 1" diy piston valves and sprinkler valves, I gotta move on up.
  • 0

User avatar
Reactor4
Specialist
Specialist
 
Posts: 58
Joined: Fri Oct 02, 2009 9:56 pm
Reputation: 0

Unread postAuthor: Technician1002 » Tue Oct 13, 2009 12:48 am

Reactor4 wrote:
Plans are on the drawing table for a 3 inch and 4 inch valved cannon.


Verrrry Nice! how big are you going to make the chamber? any design details e.g. paint job? I have been using 1" diy piston valves and sprinkler valves, I gotta move on up.


They are started, a little behind schedule. I have an 8 gallon steel tank for the 3 inch. (Propane tank) and a second tank the same size.

I was given a piece of 2.5 inch UHMWPE rod and I located some nice 2.5 inch pipe so a 2.5 inch is in the works which is being built into an 11 lb propane bottle.

I'm still trying to scrounge (cheap) a decent piece of 3 inch iron pipe without a huge ridge or groove for the pipe seam.

Here are the pictures of the propane tanks with the valves removed. The large one is about 1/3 taller than a standard BBQ tank and the little one is about 1/2 the size of a BBQ tank. The little one will become a 2.5 inch valve cannon and the large one will become the 3 inch. In the future the other large one (I have 2) will become the 4 inch. The small tank is being purged with air to remove the remaining propane.

Image

No paint schemes are picked out yet.

I am sanding the 2.5 inch pipe out to a smooth finish (Lots of work) and getting it ready to cut the ports. I have a date with a lathe in November to turn the piston to the final size and add the o ring grooves. With luck the 2.5 inch will be launching stuff by Thanksgiving.

The yellow tank is already bored out to take the 2.5 inch pipe (sorry no picture yet) so when the valve is ready, it can be welded inside. The foot ring on the bottom of the tank is cut off. I left a tab of metal to weld a link of chain to provide an attachment point for a sholder sling (like a guitar strap).
  • 0

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

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'