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APG-2 (Air Propelled Grenade, version 2)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Gaderelguitarist » Fri Apr 15, 2011 11:36 am

Yes... with his trigger hand


Touche, sir. But is he grabbing it the entire time?
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 15, 2011 11:50 am

Gaderelguitarist wrote:Touche, sir. But is he grabbing it the entire time?


I wouldn't let it out of my hand on a wargaming field ;)

LeMaudit wrote:Any chance for a shooting video?


sure ;)
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Unread postAuthor: LeMaudit » Fri Apr 15, 2011 12:07 pm

A VHS? You can't be serious!
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 15, 2011 12:08 pm

That's a shooting disc ;P
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Unread postAuthor: Secret Squirrel » Fri Apr 15, 2011 6:47 pm

Updated again, with grip, sling, and stencils. I call this one finished now. It may just be the only thing I've made that I consider finished.

It's got that rocket launcher/recoilless rifle look now, and is almost game ready, it just needs a portable fill source. It should be impressive if not effective in game, and I can't wait for a chance to use it.
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Unread postAuthor: LeMaudit » Fri Apr 15, 2011 6:54 pm

Ah! Now it looks perfect! 8)
What about this video shooting... (DVD or VHS, both make good targets) :D
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Unread postAuthor: Secret Squirrel » Fri Apr 15, 2011 7:01 pm

Video will have to wait, as it just got dark outside here. I could try making one tomorrow. Don't be expecting to much in the way of damage though, it's a 3/4in. valve with a 2in. barrel, and fires mainly nerfs.

I'm kind of worried about using shooting videos as targets...they might shoot back! :shock:

[EDIT] Maybe I was wrong about the damage...
I just put a nerf through corrugated cardboard at ~50ft.
Note to self: 80psi is too much for airsoft
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Unread postAuthor: Gun Freak » Fri Apr 15, 2011 8:43 pm

The problem with using a pocket nerf in airsoft is if you want it to go fast it will hurt like hell, but if you want it not to hurt, it is too easy to dodge :D
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Unread postAuthor: Secret Squirrel » Fri Apr 15, 2011 9:03 pm

Exactly why my alternate ammo will be a giant shotgun style round. Try dodging a cloud of a few hundred BB's
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Unread postAuthor: Gun Freak » Fri Apr 15, 2011 9:05 pm

Secret Squirrel wrote:Exactly why my alternate ammo will be a giant shotgun style round. Try dodging a cloud of a few hundred BB's

Thats what Im talkin bout! 8)
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 16, 2011 3:52 am

Looking great :D

Secret Squirrel wrote:Exactly why my alternate ammo will be a giant shotgun style round. Try dodging a cloud of a few hundred BB's


It is kind of "scale", have a look at the M67 90mm Recoilless Rifle.

Image

The M590 cartridge is designed for close-in defense against massed attacks on personnel positions. WARNING: Canister may not be fired overhead of friendly troops.

* The cartridge consists of an aluminum cartridge case crimped to an aluminum canister filled with 2,400 steel flechettes. The cartridge case is unperforated and the base contains a rupture disk. A percussion primer is assembled through the rupture disk into a perforated flash tube that is threaded into the base of the canister.
* The flechettes are 8 grain (0.52 g), low-drag, fin-stabilized, steel-wire projectiles.
* The cartridge case is filled with double-base propellant in a silk bag arranged around the primer tube.
* The canister projectile has a blunt forward end and a heavy aluminum base with three bleed holes to the cartridge case. The sides are scored to facilitate splitting when the round is fired.


The primer ignites the propellant when struck by the firing pin of the weapon. The burning propellant generates rapidly expanding gases to propel the canister out of the barrel. Recoil is minimized by blowout of the rupture disk in the base and controlled pressure release through apertures in the breechblock. At the same time, the bleed holes in the canister base permit gas pressure to build up inside the canister.

When the projectile leaves the muzzle, the pressure ruptures the canister along the score marks to release the flechettes.
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Unread postAuthor: Secret Squirrel » Mon Apr 18, 2011 7:47 pm

Updated with video. Short, and boring video, but shooting video nonetheless.

http://youtu.be/OdPuJdVmGIk
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Unread postAuthor: LeMaudit » Mon Apr 18, 2011 7:50 pm

The look & feel is really excellent! Congrats!
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Unread postAuthor: Davidvaini » Mon Apr 18, 2011 11:31 pm

so just making sure but...


The barrel is 2", the sprinkler valve is 3/4" and the chamber is 2 inch. what size for around the sprinkler valve?


externally, can you say from left to right in your picture what each pvc part/size?
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Last edited by Davidvaini on Mon Apr 18, 2011 11:39 pm, edited 2 times in total.
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Unread postAuthor: mark.f » Mon Apr 18, 2011 11:38 pm

It's all in the first post. Chamber and barrel are 2x18", and the valve itself is the only part sleeved inside 3" pipe.
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