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Extremely powerful burst disk mortar

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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Extremely powerful burst disk mortar

Unread postAuthor: bigbob12345 » Sun Mar 16, 2008 8:15 pm

Well this is my largest, loudest. and most destrustive launcher ive made yet.
I name it the LBDGBM(Large burst disk golf ball mortar)
As the name suggests its most common ammo are golf balls which are quite destructive. But when i need a bit more kick, I will use heavier ammo origionally developed for the KAMG but work for this too.
It has been deemed unsuitable for home use at above 20psi as it is just so loud.

I have only taken it to 50psi but Ill take it to 120 next time we go airsofting and ill bring my cam along. ill possibley have a friend bring his cam so i can take a high quaility vid(youve seen how bad quality my vids are).

And no there is not a triggering system I just pump it till it bursts. But i will add another unionto make a triggered burst disk pnuematic in 2 weeks from now.

And I know the barrel is short for the chamber size but its all I had on me at the moment and Im out of money. Ill get a 10ft barrel at the same time i get that other union.
I
t uses mostly spare parts, the only thigs i had to buy were the union and the end cap. It cost a total of $6.50 to make which i would say is pretty cheap for a gun of this power.

Here are the specs

Chamber:4ft of 2in pipe
Barrel:5ft of 1.5in sdr21
fill valve: schrader valve
pressure source:bike pump(takes a while to pump it up)
valve:1.5in sch80 union
Burst disk material: aluminum foil, wax paper, normal printer paper(only used at low pressure it leaks like mad at above 20psi)

Pic time

Here the monster is, quite big aint it
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the 1.5in union
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It about to shoot peice of wood
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some damage to 3/4in plywood
All done at 15psi except for one which was 50psi and penetrated all 3 layers and went on to make a nice dent in the garage :roll:

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Unread postAuthor: elitesniper » Sun Mar 16, 2008 8:17 pm

cool :) ,dont you have an air compressor to pump it up with?
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Unread postAuthor: bigbob12345 » Sun Mar 16, 2008 8:18 pm

no not yet
ill get one as soon as I can though
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Unread postAuthor: Cosmic Muffin » Mon Mar 17, 2008 5:28 am

well all i can say is... awesome how far does it go?
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 8:52 am

I have no idea.
I tried firing it up in the air at 20psi and never saw the projectile(nerf rocket thing) even though I had 2 people that stood there with there eyes peirced on the muzzel and neighther of them saw anything.
There was just a loud BOOM.
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Unread postAuthor: DYI » Mon Mar 17, 2008 6:20 pm

Cool. I'm thinking about making a little plinker like this for the summer to fire off in my back yard and generally make lots of noise. Probably with a 3" malleable iron union and a 500 ci chamber, filled to about 100 psi.
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 7:01 pm

Thanks
and that plinker your planning on making sounds like it will be nice, powerful and loud.
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Unread postAuthor: DYI » Mon Mar 17, 2008 7:11 pm

It might end up being 2" porting if I don't feel like shelling out ~$75 and waiting 2 weeks for a union, but I'd like 3", for nothing other than the eardrum-popping aspect of it.
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Unread postAuthor: SpudFarm » Mon Mar 17, 2008 7:14 pm

DYI you don't need that when you hybrid is done ;)
you can shoot you cannons out of the barrel of the hybrid at 9999999fps :D (kidding)
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 7:18 pm

DYI;well im sure it will still be loud as hell.
Make a very high cb, that would help with the eardrum popping
and im just curious how much stuff costs in canada, how much would a 2in porting cost.
Were thinking of moving there when we are not able to rent this house anymore.
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Unread postAuthor: DYI » Mon Mar 17, 2008 7:43 pm

@ "RONA":

2" black malleable iron union = 9 CDA
3" galvanised malleable iron union = 156 CDA :evil:

I'll likely be buying from McMaster though, but shipping to Georgia and then rerouting to Ontario gets kind of complex... :roll:

For the plinker, I'm going to use a 4" x 48" steel chamber, and a 3" x 72" barrel, so the eardrum popping aspect won't be too difficult.
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 7:46 pm

Okay thanks
Its actually cheaper over there for the 2in union.
Over here it is $11
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Unread postAuthor: rna_duelers » Tue Mar 18, 2008 4:38 am

I've got half a burst disc gun sitting in my shed,I should finish it.I think I might actually,look what happens when I see something I can do...It gets my mind ticking over again.

Been a while since I've posted :shock:
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