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P-36c devastator

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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What would be the best name other than P-36c Devastator?

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P-36c devastator

Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 1:07 pm

This is my copper rifle. I'm not going to go into detail on this post but if you have any questions you can post them here.
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100-0022_IMG.JPG
The rifle valve setup.
100-0024_IMG.JPG
The rifle.
Last edited by Sticky_Tape on Sun Mar 02, 2008 7:36 pm, edited 2 times in total.
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Unread postAuthor: brogdenlaxmiddie » Sun Mar 02, 2008 1:13 pm

I love the simplicity 8)
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Unread postAuthor: bigbob12345 » Sun Mar 02, 2008 1:14 pm

great gun
some specs would be nice.
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Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 1:14 pm

Thank you, I like to keep the cost down :D .
Edit: Ask what specs you want and I'll give you them :) .
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Unread postAuthor: MaxuS the 2nd » Sun Mar 02, 2008 2:39 pm

What did you make your piston and sealing face from?
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Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 2:54 pm

The body of the piston is made from 3/4 inch poplar dowel and the sealing face is 2 layers of neoprene supper glued on there is exactly 1 layer of duct tape around the body of the piston and circle of foam on the back of the piston that is supper glued to the back of the piston with 7 layers of duct tape to protect the foam from rippage.
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100-0023_IMG.JPG
Piston
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Unread postAuthor: bluerussetboy » Sun Mar 02, 2008 2:55 pm

how far does your piston travel?

what is your pilot volume?

what type of valve are you using to pilot it?

and how does it work with the schrader valve?

why didn't you use epoxy for your piston?

what psi are you using?

and how far does it shoot?

what is your ammo?
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Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 3:17 pm

how far does your piston travel? : About 1 inch.

what is your pilot volume? :Unknown but small.

what type of valve are you using to pilot it?:1/2 inch mini ball-valve.

and how does it work with the schrader valve? :The shrader doesn't have the needle thing in it that makes it a check valve.

why didn't you use epoxy for your piston? :Wood was availible cheap and it was light while epoxy is a little pricey and heavier.

what psi are you using? :As high as my pump will go {160 psi max}.

and how far does it shoot? : Haven't done range shooting but I have big hopes for it to go about 500 feet.

what is your ammo?: Darts.
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Unread postAuthor: bluerussetboy » Sun Mar 02, 2008 3:50 pm

1" of piston travel seems quite large. if you went for the d/4 'rule' it should only have 3/16" travel, that extra 13/16" is extra pilot volume you have to vent. probably doesn't matter with the ball valve, but if you were to try a blowgun it might not work. nice effort any ways.
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Unread postAuthor: Sparkie » Sun Mar 02, 2008 5:02 pm

Nice gun. how accurate is it?
What size is your barrel?
What length is the barrel?
Also what are your darts made of?
I have made a copper shooter with a 10.5mm inside diameter barrel. It is a big pain to try and find any kind of ammo for it. I did find some 10mm glass beads but it is about as accurate as throwing the damn beads myself :x Too much play in the barrel and it throws them out in all directions.
I am looking at making some darts at the moment but I am looking for different ideas.
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Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 6:22 pm

Nice gun. how accurate is it? Haven't done any feild shooting yet but I'll get back to you.
What size is your barrel? 1/2 inch pipe.
What length is the barrel? 3 feet.
Also what are your darts made of? nails ans earplugs they fit perfectly in 1/2 inch barrels.
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Unread postAuthor: Sticky_Tape » Sun Mar 02, 2008 6:26 pm

bluerussetboy wrote:1" of piston travel seems quite large. if you went for the d/4 'rule' it should only have 3/16" travel, that extra 13/16" is extra pilot volume you have to vent. probably doesn't matter with the ball valve, but if you were to try a blowgun it might not work. nice effort any ways.

3/16" seems like the barrel wouldn't be open too much and why would people fuss about putting padding on the back of the piston doesn't seem like it would be able to accelerate too fast.
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 03, 2008 12:39 am

spudchucker wrote:how far does your piston travel? : About 1 inch.


Far too much...

what is your pilot volume? :Unknown but small.


looks massive to me, if I were you I'd have the ball valve fitted before the bend.

Otherwise, looks great - how about some damage pics?
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Unread postAuthor: Sticky_Tape » Mon Mar 03, 2008 2:08 pm

I'll see if I can get some.
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Unread postAuthor: Sticky_Tape » Mon Mar 03, 2008 3:16 pm

Here you are, this is a dart that I shot at my shed door.
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Attachments
100-0010_IMG.JPG
This is the dart after fired.
100-0007_IMG.JPG
The dart stuck in the door and bent.
100-0008_IMG.JPG
This is the exit side.
100-0009_IMG.JPG
This is the side view.
100-0006_IMG.JPG
This is the close up of the back of the dart.
100-0005_IMG.JPG
This is a dart that I made out of
wire coat hanger, an earplug, super glue, and the core of some cord.
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