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 57 users online :: 3 registered, 0 hidden and 54 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

6"x3" coaxial launcher [now with video!]

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.
Sponsored 
  • Author
    Message

6"x3" coaxial launcher [now with video!]

Unread postAuthor: SplatteredStarch » Fri Oct 03, 2008 6:27 pm

This spring it came up in conversation with a new friend that I once upon a time was into building potato launchers. I dug my old 4"x2" coaxial out of the garage and we took it to his field and had a good time, and of course he wanted a bigger better launcher. Thus we constructed a 6"x3" (sch 80) coaxial piston launcher.

There are 2 Issues I need to sort out.

1. The launcher uses a 3/4" QEV to pilot the piston valve. To trigger the cannon we attached a male 1/4" quick disconnect to the fill side of the QEV then a regular air hose to a blow gun. (the thought being you could take the hose off for transit) Firing the cannon via that setup caused the qev to reseat, and thus reseat the piston valve. Separating the quick disconnect on the charged cannon, and kinking over the "trigger" hose both fired the cannon correctly. My assumption is there is too much restriction in the trigger line for correct operation. (I assume increasing flow in the trigger line will solve this issue)

2. My main issue, This cannon is big and heavy. The only tests I have done have been with the cannon strapped down to a big heavy router table. This makes the cannon not portable at all, and nearly impossible to aim. I was looking for ideas (pictures especially) of well built cannon stands. The stand will be a trailer to tow behind a 6x4 gator, incorporating elevation adjustments, and ideally windage adjustments. I would also like to include recoil suppression but that may not be necessary if the stand is rugged enough (but it would look cool).

Image
Image

So please share your thoughs!

Thanks

SplatteredStarch

EDIT: added promised pictures, someday ill get some better ones with less distracting stuff in the background.
  • 0

Last edited by SplatteredStarch on Sun Oct 05, 2008 2:43 pm, edited 3 times in total.

SplatteredStarch
Private
Private
 
Posts: 4
Joined: Fri Oct 03, 2008 5:20 pm
Reputation: 0

Unread postAuthor: FishBoy » Fri Oct 03, 2008 7:05 pm

this sounds impressive, get some pics when you can.

About the stand, I can't say I have a lot of experience with them. I would make a simple base with 2 by 4s and then a simple swivel (can be as simple as a bolt) then like another 2 by 4 or a 1 by 4 for the gun to strapped to
  • 0

"You polish a turd, it's still a turd"

Remember DYI!!!
User avatar
FishBoy
Colonel
Colonel
 
Posts: 575
Joined: Tue May 27, 2008 5:51 am
Reputation: 0

Unread postAuthor: Pilgrimman » Fri Oct 03, 2008 7:09 pm

Could you describe the trigger setup more clearly? My impression is that the 1/4" quick connect is in the fill port of the QEV, and you have the female end connected to the hose, and to the blowgun. I think, based on your description, however, that your problem might be a combination of 2 things. One, you might be restricting flow with the small I.D. hose, and two, you might simply have too large of a pilot volume for the blowgun to exhaust, especcially if your hose is long. If you could clarify some more, I'd be happy to help :D
  • 0

Yeah, we wouldn't want to anger the bees, now would we??

I HATE YOU BEES! I HATE YOU BEES! I HATE YOU BEES!

LMAO Classic!!!! I love Family Guy!
User avatar
Pilgrimman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 481
Joined: Thu Jun 28, 2007 1:10 pm
Location: Grants Pass, OR
Reputation: 0

Unread postAuthor: psycix » Sat Oct 04, 2008 1:02 pm

Wow that cannon looks brutal.
The flanges with the bolts give it an awesome look.

I do understand it is not very easy to walk around with, so you should indeed try to make a stand for it, preferably a wheeled one.

Drop as much of that hose as you can, because this is an unbelievable amount of pilot volume and flow restriction that you are adding up.
Make sure to do that quickly before some "efficiency maniac" reads this topic and is going to scream that you should cut it.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Oct 04, 2008 1:12 pm

Jesus H. Christ, love the look :) As above, a (much!) shorter trigger line will greatly reduce the QEV's pilot volume and therefore it should fire well.

This thing looks like it can do a LOT of damage, even at low pressures - so pictures/videos would be much appreciated ;)
  • 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: Velocity » Sat Oct 04, 2008 1:31 pm

I personally do not think the long hose will have a great effect on the actuation speed. The pilot line is only hooked up to the QEV, not the big valve. As a result, the drop in performance will not be anything near as great as if you had a hose leading from the launcher to the main activation QEV.

This cannon does look like a monster though; those big flanges must have cost a fortune!
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: starman » Sat Oct 04, 2008 3:42 pm

Now that thing has some cohones... :shock: I like it!!

Recoil is going to depend on the mass of the projectile you fire. I assume with a 3" barrel you'll be shooting baseballs and veggies cans...these (esp the veggie cans) will produce a very noticeable recoil wallop.

You're going to need a fairly sturdy setup as you have already surmised. The quickest route would be to mock up a 2 x 4 mount. Here's an A frame type I've used.
Image
It has no recoil comp but you could certainly build it in to it. It was orginally a trebuchet frame... 8)

Recoil could possibly be damped with a pneumatic hood lifter. You can get those at an auto parts store. They come in different sizes and forces so you will have to experiment a bit to get one that fits your need.

Looks great! Work on improving the triggering as others have wisely suggested.
  • 0

Last edited by starman on Sat Oct 04, 2008 7:45 pm, edited 1 time in total.
User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: CasinoVanart » Sat Oct 04, 2008 6:40 pm

It looks like Frankenburstdiscs' ungodly great big brother :shock:
I hope you used pressure rated BOLTS, lol.
Great work mate, can you hurry up and fire this beast please, oh a video of said action is a must too :D
  • 0

User avatar
CasinoVanart
1st Lieutenant
1st Lieutenant
 
Posts: 281
Joined: Wed Jul 30, 2008 1:10 am
Reputation: 0

Unread postAuthor: daberno123 » Sat Oct 04, 2008 6:46 pm

It looks... BIG.

How much has this project cost you? Those flanges and even the pipe itself must have cost a pretty penny.

Looks good, always great to see something taken to a larger than normal scale. A vid would be nice...
  • 0

User avatar
daberno123
Colonel
Colonel
 
Posts: 594
Joined: Mon Nov 19, 2007 5:56 pm
Location: Ohio
Reputation: 0

Unread postAuthor: starman » Sat Oct 04, 2008 7:38 pm

Just taking another look here....love the bolts man! and the flange usage. Very inventive!

I know it's heavy...love the bolts though!


PS. Did I mention I really love the whole 6" flange bolt thing you have there.....??? You need to put this dog up for stud service man.... :lol:...seriously....
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: VH_man » Sat Oct 04, 2008 8:00 pm

^I think I need a paper towel^

absolutely Gorgeous.... and HUGE! and the flanges are awsome.

How much did you spend on that bad-ass mother F***er of a cannon?
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: frankrede » Sat Oct 04, 2008 9:19 pm

  • 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: SplatteredStarch » Sun Oct 05, 2008 2:14 pm

Took the trigger hose and cut it much much shorter, works great now. Just took it down to the field, mounted on the track rack. The ranger worked as a pretty decent stand, so now we just need to build a simple elevation and windage adjustment. Took some video, and more pictures, ill see if i can figure out how to get video up.

[youtube]http://www.youtube.com/watch?v=8-C65PSarJw[/youtube]
[youtube]http://www.youtube.com/watch?v=bCp2Qyyjo8I[/youtube]
Image
Image
  • 0

Last edited by SplatteredStarch on Sun Oct 05, 2008 7:00 pm, edited 4 times in total.

SplatteredStarch
Private
Private
 
Posts: 4
Joined: Fri Oct 03, 2008 5:20 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Oct 05, 2008 4:03 pm

Everyone loves flange it would seem :roll: :D
  • 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: starman » Sun Oct 05, 2008 4:34 pm

....Loves flange!!

Were these dry fires or did you actually shoot a projectile?

@JSR: what's up with your discombobulated link...
  • 0

Last edited by starman on Sun Oct 05, 2008 7:17 pm, edited 1 time in total.
User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'