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Pneumatic shotgun

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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Pneumatic shotgun

Unread postAuthor: Demon » Sun Sep 14, 2008 12:40 pm

The specs:

1 inch x 2 foots barrel.

modded sprinkler valve(1 inch).

1.25 inch by 2 foots chamber.

I do "clay" shooting with it(throw a potato, aim and fire on it, lot of fun)

Its able to pierce 4 layers transport cardboard with .2 grams bbs(.2 are not enough heavy for this gun, i will need .3 or .4 ones).

There have been an error with pictures orders :oops:
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Attachments
Photo 002.jpg
The gun...
Photo 004.jpg
The catridge...
Photo 006.jpg
The valve...
Photo 007.jpg
The barrel...
Photo 009.jpg
Loading...
Photo 009.jpg (35.37 KiB) Viewed 1471 times
Photo 010.jpg
Loading...
Photo 011.jpg
Loading done...
Photo 013.jpg
Different ammo...
(green bbs are mini paintballs)
Photo 012.jpg
Me holding the gun...
Photo 012.jpg (17.32 KiB) Viewed 1471 times
Photo 015.jpg
DAMAGE!
(i am not sure if it was an dog food round or an airsoft one)
Paintballs go trough 3 layers of it!
Photo 015.jpg (35.85 KiB) Viewed 1449 times
Last edited by Demon on Sun Sep 14, 2008 1:18 pm, edited 3 times in total.
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Unread postAuthor: VH_man » Sun Sep 14, 2008 12:56 pm

Very nice.

Kinda like Daviadvani's Grenade Shells, but less... strong... and for things that arent airsoft-related.

Damage?
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Unread postAuthor: Demon » Sun Sep 14, 2008 1:12 pm

I am currently running to my basement to take so damage shots.
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Unread postAuthor: frankrede » Sun Sep 14, 2008 1:19 pm

VH_man wrote:Very nice.

Kinda like Daviadvani's Grenade Shells, but less... strong... and for things that arent airsoft-related.

Damage?
Actually this probably is stronger.
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Unread postAuthor: Demon » Sun Sep 14, 2008 1:20 pm

I think too: marbles go in straight line on 200 yards :twisted:

(yeah, i know its alot).

and for the damage picture it is an dog food round.

Getting trough heavy cardboard with dog food!
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Unread postAuthor: Davidvaini » Sun Sep 14, 2008 1:43 pm

frankrede wrote:
VH_man wrote:Very nice.

Kinda like Daviadvani's Grenade Shells, but less... strong... and for things that arent airsoft-related.

Damage?
Actually this probably is stronger.



Actually after running through the numbers they look pretty close in comparison when it comes to power.

Reason being is a burst disk is a better valve than a sprinkler valve and increases power but I have less chamber volume.
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Unread postAuthor: psycix » Sun Sep 14, 2008 3:53 pm

Cool creation!
I like the shells, though isnt it alot of work for one shot?

@david
Yep, yours is just in a smaller package, but the power is probably in the same range. Only difference is size.
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Unread postAuthor: Demon » Sun Sep 14, 2008 4:21 pm

Psycix:

The one you just see are the old version, i now only put 2 wads of toilet paper on each side. less time to make and same results.

but the plastic bag ones looks better :D
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Last edited by Demon on Fri Sep 19, 2008 3:06 pm, edited 1 time in total.
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Unread postAuthor: VH_man » Sun Sep 14, 2008 8:26 pm

by strong i meant that the shells might not hold up to abuse as much as Davidvani's burstshells......
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Unread postAuthor: mark.f » Sun Sep 14, 2008 9:38 pm

Looks good, and yeah, you have to upload the pictures in reverse order if you want em the way you had them in order.

The only thing I would comment on is the valve, it seems to have a narrow spigot-thing sticking out the top that was most likely associated with some piece of unnecessary hardware. I usually just like straight, frill-less, 1" Orbit-Masters. But, it's just an opinion, and it it works the same then it was all for nothing, right?

Good job on the cannon.
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Unread postAuthor: psycix » Mon Sep 15, 2008 8:03 am

Demon wrote:Psycix:

The one you just see are the hold version, i know only put 2 wads of toilet paper on each side. less time to make and same results.

but the plastic bag ones looks better :D

Ah that sounds good.
You could also add more plastic to them, to act as burst disk and make up for valve opening time.
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Unread postAuthor: Demon » Fri Sep 19, 2008 3:08 pm

You could also add more plastic to them, to act as burst disk and make up for valve opening time.


Nope... the plastic bag is only maintained by an pressure of the electric tape and dont make any bust disk effect.
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Unread postAuthor: psycix » Sun Sep 21, 2008 1:28 pm

I mean, you COULD do that.
Add more layers (maybe aluminum foil?) and you'll have a burst disk.
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