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 60 users online :: 4 registered, 0 hidden and 56 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Pneumatic breech-loaded 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

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Mon Jul 24, 2017 5:10 am

Shells are brazed.

Enola Gaye grenades are solid grenades indeed, but this principle is unsafe for "high velocity" cannons I'm afraid. Maybe lobbing them in high arc could work, but my gun shoots around 10° elevation in practice and someone could get hit along the flight path. That's why my projectiles visibly mark a target hit with colored powder, but do not really mark any surrounding players (that's why I call them "armor piercing"). I believe that safe simulated HE paintball ammo with the range above that of paintball marker is extremely difficult to make.
  • 0


Sear
Private
Private
 
Posts: 23
Joined: Thu Apr 21, 2016 6:17 pm
Country: Austria (at)
Reputation: 7

Re: Pneumatic breech-loaded cannon

Unread postAuthor: jackssmirkingrevenge » Tue Jul 25, 2017 6:41 am

I believe that safe simulated HE paintball ammo with the range above that of paintball marker is extremely difficult to make.


It's possible with tiny pyrotechnic charges, the Airsoft Pyrotechnics products seem to have achieved this with both their impact fuzed and delay fuzed munitions:



When you depend on a chemical reaction, it's the lightest and most compact way to store energy (as opposed to pressurized gas for example) which makes it safe enough to hit someone directly without causing harm. Unfortunately for many locations pyrotechnics are difficult to obtain and even then not allowed for most games.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24532
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 84

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Tue Jul 25, 2017 7:16 am

I dived into their products a year ago to see whether they aren't up to something. They may be, but to something a bit different. Their hand grenades (and likewise Enola Gaye constructions) may have decent paint spread, but they are too heavy and stiff and dangerous to be launched.

Then they have grenade launcher ammunition with either delayed or impact-triggered pyrotechnic sound effect and marking ammo (with basically no paint spread, similarly to my A.P. rounds). But this is not HE simulated ammo the way the player is hit with the paint or BBs. This problem (HE, long distance arty) may have a solution, but incredibly costly one in order to have 100% safety.

Of course you may play the style that proximity impact of the shot (basically any shot, even nerf rocket) eliminates surrounding players within certain radius and without the need of any hit or paint splash. It may work for some folks. I'm just personally not the fan of this approach.
  • 0


Sear
Private
Private
 
Posts: 23
Joined: Thu Apr 21, 2016 6:17 pm
Country: Austria (at)
Reputation: 7

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Cthulhu » Tue Jul 25, 2017 3:59 pm

I've made shells similar to the enola Gaye grenades.
I made a positive out of wood on a lathe and a negative out of plaster Paris, then by placing several layers of paper soaked in a glue-water mix (essentially paper maché) in the mold and keeping it squeezed tight over night, I was able to make rigid and durable shells.
Then simply fill with your paint of choice (I actually stuffed mine with "hippie paint" [dyed cornstarch])and shove in a firecracker. Making the fuse is as simple as poking a hole in the tip and planning a toy cap inside.

You get the idea, it works decently well if you take your time and experiment!
  • 0


Cthulhu
Specialist
Specialist
 
Posts: 49
Joined: Wed Apr 12, 2017 7:07 pm
Country: United States (us)
Reputation: 0

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Tue Jul 25, 2017 5:13 pm

That is an interesting experience. Thanks for sharing it! I've tried Enola Gaye grenade years ago, I believe it was their first attempt at that time. It didn't work too well for me. But I don't doubt that with enough skill and mostly dedication you are getting usable results using this tech (as they are getting nowadays). As a hand grenade, it may work very well.
The problem I'm having with this tech is that the mass/velocity ratio of such ammo is too high for long-distance cannon fire. You would need to reliably detonate such shot before it impacts (or before it transfers its energy after impact) and here come the difficulties ;)
  • 0


Sear
Private
Private
 
Posts: 23
Joined: Thu Apr 21, 2016 6:17 pm
Country: Austria (at)
Reputation: 7

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Cthulhu » Wed Jul 26, 2017 5:26 am

Sear wrote: You would need to reliably detonate such shot before it impacts (or before it transfers its energy after impact) and here come the difficulties ;)


That's a good point, possibly a timed fuse as in real artillery? But that is also mechanically complicated.
  • 0

Attachments
images.jpg
Timed shell fuse
images.jpg (7.11 KiB) Viewed 184 times

Cthulhu
Specialist
Specialist
 
Posts: 49
Joined: Wed Apr 12, 2017 7:07 pm
Country: United States (us)
Reputation: 0

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Wed Jul 26, 2017 7:07 am

Not only that. Flight time is not constant and you don't usually need it to detonate mid-flight. And what if the pyro fuse fails? You cannot afford it hitting the ground as solid shot. What if the projectile gets damaged during the launch, loses stabilization and hits the ground much sooner? And these concerns do not exactly decline with smaller calibers; you still need them to have enough fill to make usable coverage and 50 grams of paint will not do it.

Therefore paintball arty is usually limited to either nerf usage with the rule that the proximity impact eliminates players, or to canister shots with paintballs or the smallest water balloons available, reducing the effective range to that of paintball markers. At least that has been my understanding so far. I suppose you plan to use canister ammo with paintballs primarily?
  • 0


Sear
Private
Private
 
Posts: 23
Joined: Thu Apr 21, 2016 6:17 pm
Country: Austria (at)
Reputation: 7

Re: Pneumatic breech-loaded cannon

Sponsored

Sponsor
 


Re: Pneumatic breech-loaded cannon

Unread postAuthor: Cthulhu » Wed Jul 26, 2017 8:28 am

Sear wrote: I suppose you plan to use canister ammo with paintballs primarily?


From my experience we just used those powder shells I described, but we never particularly aimed for players but to arc our shot into or over a bunker. To get out players in the field, canister was the most effective, but it had issues with popping in the cannon barrel and spreading too much in flight.

How do you produce your foam marking shots?
  • 0


Cthulhu
Specialist
Specialist
 
Posts: 49
Joined: Wed Apr 12, 2017 7:07 pm
Country: United States (us)
Reputation: 0

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Sear » Thu Jul 27, 2017 7:05 am

I'm not ready to disclose details about the ammo construction, apologies.
But yesterday I got a nice idea of how extend the range of canister shots by 50 meters easily, that I'm willing to share ;) This solution should be 98% safe, 100% safe in case an extra advanced tech is utilized.
Imagine a lightweight tube, could be even paper tube, with solid bottom and paintballs held by soft wad inside. I saw a 75 mm paper tube for rocket modellers, that should fit rather nicely into 3" barrel. The sabot needs to be stabilized, as it will fly those ~50 meters as solid shot. The trick is that the sabot will be connected with the gun or shell casing by thin yet strong fishing line or something similar. It needs to be able to stop the sabot mid-flight. What will then happen is that paintballs will push the wad out and continue to fly onwards. Sabot then falls down harmlessly with no energy left.

Prerequisite is that such shots are fired in 20° to 25° angle. It would not work for mortars, paintballs would deplete all their usable energy before they hit the ground. And of course one would need to technologically overcome the fact that after firing, most of the 200+ paintballs in the paper tube will be smashed by default.
  • 0


Sear
Private
Private
 
Posts: 23
Joined: Thu Apr 21, 2016 6:17 pm
Country: Austria (at)
Reputation: 7

Re: Pneumatic breech-loaded cannon

Unread postAuthor: Cthulhu » Thu Jul 27, 2017 9:40 am

That's an interesting concept that I'll have to try out, my only fear is that when the sabot reaches the end of the string it will be yanked, causing the paintballs to spill in the direction of said yank.
  • 0


Cthulhu
Specialist
Specialist
 
Posts: 49
Joined: Wed Apr 12, 2017 7:07 pm
Country: United States (us)
Reputation: 0

Previous

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'