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 61 users online :: 4 registered, 1 hidden and 56 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

My first cannon posted on this site.

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

My first cannon posted on this site.

Unread postAuthor: Alex345 » Mon Nov 28, 2011 5:31 pm

Hi there.

Although this is not the first cannon i ever built, the other two were the manual chamber-ballvalve-barrel type. Which was fun for a while, but this is my first more "advanced" attempt at this :D And English is not my native language, so i hope my writing isn't too bad :D

Image
My main goals were to keep it portable, simple, affordable and easy on the eyes :)

Image
The 3/4 QEV was the most expensive part, but the hardest parts were the two elbow-ish pieces (Getting them to fit perfectly) that are responsible for the very neat alignment of the barrel and chamber, its hard too see on the pictures, but they barely touch. The gun is filled through the quick disconnect on the back.

Image
The pilot valve was recovered from an old powder extinguisher, it vents the pilot air quickly (Enough.. I think) AND it came with a very nice little pressure gauge :D

Image
I use an HPA rig with a makeshift adapter to fill her up :) Unfortunately, i use the rig for a few airsoft guns i own, so it was never meant for high pressure. The gauge only goes to about 16 bar, whilst i intent to run the cannon at 20 bar... And i don't wanna risk breaking the gauge.

Image
The barrel is an aluminum profile tube, screwed (With some effort...) into a fancy looking 3/4 union fitting. Because of the limited pressure and the fact that i still need to solve a slight leak, means that i haven't really had time to test ammo. But i plan to use homemade candle wax slugs with a steel penetrator inside of them.

I already tried this once and was pleased with the results :) A co² cartridge (Not 12g but just a tad bigger) fits inside the barrel PERFECTLY! But i only have ONE of those lying around :(

Image
And i also made a rifle grenade for it out of boredom :D Its incredibly fun to launch in the backyard and makes a great "thump!" when you shoot it^^

Image
The fit of the grenade on the barrel is perfect IMO especially because it was a pure coincidence! The fit is so tight that if you move the grenade up and down on the barrel whilst keeping the pilot valve open, you can hear the QEV opening and closing :D That is, if the cannon isn't pressurized of course :p

BUT UNFORTUNATELY: When i was taking these pictures today, the cannon fell on the ground with the grenade attached to it... Result, a few fins broke of and i'm not sure if i want to fix em again since getting them glued on in the first place was tricky as hell.

Anyway, i hope you guys like my first "decent" creation :) Feel free to say what you think about it or to ask questions!

Greets.
  • 0


Alex345
Corporal
Corporal
 
Posts: 77
Joined: Sun Jun 13, 2010 3:26 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 5:45 pm

Nice, love the all metal construction and the grenade is a nice touch.

On the other hand, you can't present an HPA cannon without damage pics/videos, this looks like it's pretty destructive ;)

<s>Hot tip: If a CO<sub>2</sub> cartridge fits, so does a 12 bore shotgun wad ;)</s>

Edit: nevermind, thought it was a 12 gram, looks like the one you have is a 16 gram.
  • 0

Last edited by jackssmirkingrevenge on Tue Nov 29, 2011 4:39 am, edited 1 time in total.
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 » Mon Nov 28, 2011 5:46 pm

Great job dude! That thing is nice!! Pilot volume's a bit large but that's alright if it works! :)
  • 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: evanmcorleytv » Mon Nov 28, 2011 5:53 pm

VERY NICE!! And welcome to Spudfiles!
  • 0


evanmcorleytv
Major
Major
 
Posts: 350
Joined: Sat Jun 19, 2010 3:44 pm
Location: Tuscaloosa, AL
Reputation: 0

Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 6:02 pm

That looks great, I like the pilot valve! Welcome to Spudfiles! :D
  • 0

User avatar
sharpshooter11000
2nd Lieutenant
2nd Lieutenant
 
Posts: 248
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK
Country: United Kingdom (uk)
Reputation: 2

Unread postAuthor: mark.f » Mon Nov 28, 2011 6:06 pm

Looks solid and I like the look of the fire extinguisher valve for the pilot. Fire off some 12 gauge shotgun wads with random steel junk and film it for posterity. :wink:
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3464
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Alex345 » Mon Nov 28, 2011 6:39 pm

Thanks for all the nice replies! I have a picture of the CO² cartridge compared to a normal 12g cartridge:
Image
Image
As you can see, its a nice fit :)

And i found a damage pic for you guys, its the one candle wax with penetrator round i tested, note that this was not fired at full pressure ;)

Image
The "smudge" you see around the hole is from the candle wax expanding when it hit the target, the actual hole is from the steel insert :D

Image

@Gun Freak: I was indeed a little worried about the pilot volume at first, but a soon as i squeeze the valve it just goes bang! I don't have the feeling that something is wrong or not working correctly ;) But on the other hand, this is my first QEV cannon, and i reckon that you have alot more experience whit these thing then i do :D
  • 0


Alex345
Corporal
Corporal
 
Posts: 77
Joined: Sun Jun 13, 2010 3:26 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: MrCrowley » Mon Nov 28, 2011 6:41 pm

Awesome build! How's the fire extinguisher pilot valve working for you? You could try a 1/2" ball valve just to see if it increases performance much. My dry powder fire extinguisher had reasonably poor flow but yours may be different. You could also minimize the pilot volume and keep the fire extinguisher valve.

If you measure the port of the fire extinguisher you can model the performance of the cannon using GGDT:
http://www.thehalls-in-bfe.com/GGDT/

:)
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Gun Freak » Mon Nov 28, 2011 6:41 pm

Actually I've never used a QEV :D
As long as there isn't a noticable delay between triggering and firing, you should be good.
  • 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: Alex345 » Mon Nov 28, 2011 6:56 pm

Hmm i can't really guess the size of the port just by looking at it, but maybe this pic will help to make an estimate:

Image
  • 0


Alex345
Corporal
Corporal
 
Posts: 77
Joined: Sun Jun 13, 2010 3:26 pm
Reputation: 0

Unread postAuthor: Gun Freak » Mon Nov 28, 2011 7:03 pm

Looks like about a 1/2" diameter, but that doesn't mean the valve stem port is 1/2" also. It is probably 1/4" to 3/8", I'd guess.
  • 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: Alex345 » Mon Nov 28, 2011 7:17 pm

Well like i said, when i open the valve it just goes boom :D I can't seem to hear any noticeable delay when shooting it, unless i open it slowly. Its pretty much like pulling the trigger on a rifle. Not squeezing it of course :D
  • 0


Alex345
Corporal
Corporal
 
Posts: 77
Joined: Sun Jun 13, 2010 3:26 pm
Reputation: 0

Unread postAuthor: daniel0663 » Mon Nov 28, 2011 7:30 pm

Very nice looking cannon.
Looks very clean and a well thought out design overall,
The Trigger/gauge is a nice touch in my opinion.

Not to mention the HPA supply source, awesome...


:wink:
  • 0


daniel0663
Sergeant First Class
Sergeant First Class
 
Posts: 131
Joined: Wed Dec 15, 2010 10:57 pm
Location: New Zealand
Reputation: 0

Unread postAuthor: jrrdw » Mon Nov 28, 2011 10:31 pm

Alex345 wrote:Well like i said, when i open the valve it just goes boom :D I can't seem to hear any noticeable delay when shooting it, unless i open it slowly. Its pretty much like pulling the trigger on a rifle. Not squeezing it of course :D


Do you hear any air leaving the cannon directly after the shot?
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: Alex345 » Tue Nov 29, 2011 4:22 am

jrrdw wrote:Do you hear any air leaving the cannon directly after the shot?

Nope, unless i keep the HPA rig connected between shots because it will keep supplying air :)
  • 0


Alex345
Corporal
Corporal
 
Posts: 77
Joined: Sun Jun 13, 2010 3:26 pm
Reputation: 0

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'