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 65 users online :: 3 registered, 0 hidden and 62 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

oak gunstock with a simple brass coaxal attached

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

Unread postAuthor: jook13 » Sat Mar 21, 2009 6:12 pm

Thanks man. I got to test it in my garage tonight, at 100 psi it shoots around 475 fps and at 400 psi it is averaging in the 780 fps range. This is with 1/4 inch steel ball. It took me by surprise at how quiet it is, even at these pressures.

I havent had the chance to do any damage, just test with my chrony. But it is the weekened and I have a bottle of ketchup that expired 7 years ago, and some old cameras and cell phones. Tomorrow will be my day of fun!
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: Ragnarok » Sat Mar 21, 2009 6:37 pm

That's not a bad muzzle energy. About 20 ft-lbs, which puts it above a good number of air rifles.

Now, about your stock, I'm not levelling any criticisms against your manufacturing technique here, that part is well done - but I do have a couple of points on it's design.

Firstly, the length of the hand grip doesn't look big enough for a hand relative to the thumb-hole, at least without your hand escaping off the bottom of it regularly. However, there isn't much for a sense of scale in the picture nor do I know the size of your hands, so I may be wrong.

My second point is that this stock has no cheek-piece, which is pretty important for consistency of the eye against the scope eye piece (which is also important for accuracy).
Compare it to both the stocks for my Air Arms, both the Original and the one of my own design/construction. As you can see, the back of the stock doesn't fall away in the same way as your design does, which gives the cheek somewhere to rest.

If you weren't looking for a critique, I apologise - but I sort of work on the principle that the showcase isn't just for "Ooh, that's nice" or "Awesome", but also suggestion for improvement.
  • 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: jook13 » Sat Mar 21, 2009 6:51 pm

No worries. I appreciate the critique. This was my second attempt at a wooden stock and my first real attempt at going above just getting the general shape of a gun, so I know I am no master or anything. I garentee my next will take your points into account.

I had only a certain length of wood to work with (it was free from daddy) or else I would have had to buy some. I made the butt of the stock as small as possible to lengthen the forgrip. The whole thing is quite a few inches shorter than I would like it to be, it feels like a red ryder. At least it looks cool, in my opinion.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Mar 22, 2009 8:51 am

Ragnarok wrote:That's not a bad muzzle energy. About 20 ft-lbs, which puts it above a good number of air rifles.


Indeed, very impressive. Not to mention that with a steel ball the penetration is going to be more impressive than an air rifle of similar power firing lead pellets, looking forward to some damage pics :) and, because of your setup, how about try a few 30 yard groups and see what sort of accuracy it's capable of?
  • 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: superpenguin » Sun Mar 29, 2009 7:23 pm

that is sweet im thinking about a small calliber sniper and that stocks put some idaes in my head. nice gun probbaly has nice damage and pretty accurate :wav: :rr: :violent3: . i bet you could wad it and uses pellet gun pellets.
  • 0

User avatar
superpenguin
Private
Private
 
Posts: 10
Joined: Sun Mar 29, 2009 2:10 pm
Reputation: 0

Unread postAuthor: sputnick » Sun Mar 29, 2009 8:10 pm

The stock form is beautiful, and the gun is magnificent, the only complaint I would have would be the stain job being a little uneven, but a layer of varnish and some polishing would fix that right up,

It's a beautiful gun, I love your stocked coaxial beauties,

Always able to get me all hot and bothered :wink: :D
  • 0

Image


Add me on MSN to chat about whatever!
User avatar
sputnick
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Sun Dec 14, 2008 3:53 pm
Location: Ontario Canada
Reputation: 0

Unread postAuthor: jook13 » Sun Mar 29, 2009 9:04 pm

Thanks again for the kind words fellas. I got to shooting it a bit this weekened. The power is definately satisfying. I chronied one shot at 847 fps. Not bad for such a small chamber. I didn't take any damage pictures because the accuracy has been dissapointing. I need to better secure the barrell to the stock as it is fairly flimsy. I got a spread of around 6 inches at 45 feet. Plus using a shock pump to get to 400 psi gets tiring. I got a hold of a fridge compressor, I am getting ready to wire it up, so I will do more when that project is finished.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Mon Mar 30, 2009 12:23 am

jook13 wrote:I got a spread of around 6 inches at 45 feet.


How tight is the projectile in the barrel? And is the grouping random or spread vertically/horizontally?
  • 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: jook13 » Mon Mar 30, 2009 12:30 am

The projectiles are loose enough to slide down the barrel, but tight enough to where it takes about 10-15 seconds to reach the bottom. I have to put I ear up to it to hear when it stops. The grouping is random. It seems as though the barrel moves a tad every time I fill it up (all that pumping and whatnot), It isnt very secure at the moment. I am in the process of building a little piece that will fix it. I hope.

I know I could do better seeing as how I have done better using marbles in the past.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Mar 30, 2009 12:45 am

If I could make a suggestion, why not sleeve the barrel with a rigid piece of pipe (possibly even the same material as the chamber) and port the ends, this will give you a sturdy barrel along with an integral suppressor, with the added benefit of reduced muzzle blast so there's less air to destabilise the projectile as it exits the barrel.

It would also look better aesthetically, more "realistic" so to speak ;)
  • 0

Attachments
suggestion.gif
suggestion.gif (12.22 KiB) Viewed 2046 times
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: jook13 » Mon Mar 30, 2009 1:21 am

I like the idea, I have thought about it before. I didnt want to because I wanted to call the stock done, but I am thinking I will do just that.

Its hard to motivate myself to work much more on this seeing as how I am nearing completion on my piston hybrid. (first hybrid, hell yeah!)
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: starman » Mon Mar 30, 2009 2:43 am

Really great work jook! I somehow missed this when you first posted it. I like the woodwork but the cannon works are well done as well...and impressive performance to boot.

...and you have a hybrid arriving soon...man, you are one busy cannon builder lately... :wink:
  • 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: covey12 » Tue Apr 28, 2009 1:29 pm

wow, really good stock, looks like a real gun, do you plan to use it for hunting or just targetshooting
  • 0

User avatar
covey12
1st Lieutenant
1st Lieutenant
 
Posts: 260
Joined: Sat Aug 23, 2008 4:36 pm
Reputation: 0

Unread postAuthor: jook13 » Tue Apr 28, 2009 7:07 pm

That is confidential.

Read this link. Specifically rule number 2.

http://www.spudfiles.com/forums/rules.html

Thanks for the compliments though, this is one of my favorites to shoot.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: Gaderelguitarist » Tue Apr 28, 2009 8:51 pm

Lack of a cheek-piece aside, its a beautiful gun.

I have to agree with JSR about reinforcing the barrel.

That small bore barrel looks rather awkward on a nearly full sized stock, and more stability would give you an increase in accuracy.
  • 0

User avatar
Gaderelguitarist
Colonel
Colonel
 
Posts: 580
Joined: Sat Aug 16, 2008 9:56 pm
Location: Columbia, MD
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'