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Peacemaker MK4

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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Peacemaker MK4

Unread postAuthor: Lokoyo » Wed Dec 23, 2009 8:52 am

So I'm not too active on the forum much so Idk if I am copying anyone.

In each cannon, I try to add in 1 new feature. In this cannon, I added in an air regulator in order to get multiple shots. I have pressurized this to 80 psi.

Backpack: 3x 2" by 1.5' with fittings (~200 cubic inches)

Chamber: 3/4" by 2' with fittings (~11 cubic inches)

Barrel: 3/4" and 1/2" (~11 cubic inches and 5 cubic inches)

Straps: I use leftover tubing to create straps and no they are not pressurized)

Firing Valve: 3/4" Mod Sprinkler

The weird extension thing on the backpack contains my gauge and at the top is a schrader valve.

So far, I can get 3 40psi shots when the backpack is charged to 80psi.

Changes I need to make:
-Replace the tubing from the backpack to the chamber with a higher pressure-rated tubing (currently only 40psi). Planning to use some of those braided tubing.

-I'll probably make a larger chamber (double the size to ~20 cubic inches)

I believe I'm going to get flame for this but I tried using search and so far I haven't had any luck with it:
How to make a mag

I will upload damage pics soon (in a few days)

I hope you guys like :) Reminds me of Ghostbusters
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Unread postAuthor: elitesniper » Wed Dec 23, 2009 11:06 am

''Who you guna call?! GHOSTBUSTERS!

Nice @ clean cannon, i love the regulated backpack:D
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Unread postAuthor: Demon » Wed Dec 23, 2009 12:07 pm

Nice clean airgun, but you should try to avoid posting your face on internet especially if its illegal where you live.

I have built a paintball magazine wich can hold 5 rounds, its pretty easy to build out of aluminium sheets and wood.

Where have you got the air regulator?
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Unread postAuthor: psycix » Wed Dec 23, 2009 2:23 pm

Looks good. I like the backpack.

How do you let air flow from the backpack into the chamber?
Slow leaking? Manual valve?
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Unread postAuthor: Marffy » Wed Dec 23, 2009 2:44 pm

Cool cannon, i really like the back pack. Whats your primary ammo? Have you tried nail darts?
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Unread postAuthor: veginator » Wed Dec 23, 2009 6:08 pm

I'm thinking you should flood the backpack halfway with water and get one helluva water gun.
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Unread postAuthor: bradisfun » Wed Dec 23, 2009 6:45 pm

well that might not work as he has to be taking water from the bottom other wise the air will just come out the top, have a look at the followinghttp://www.thehalls-in-bfe.com/UberSoaker/ubersoaker.html
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Unread postAuthor: Lokoyo » Wed Dec 23, 2009 7:18 pm

Thank you. I'm planning to get some high rated tubing tomorrow so I can bring my chamber to 80 psi.

I got my regulator at Harbor Freight. It refilled itself to 40 psi in about 3 seconds.

I might make some nail darts but I haven't yet. I have an 8" metal rod (1/4" in diameter) and it has some tape at the end. I shot it at a plastic 3 ring binder (like the ones people use for school). I'll upload pics in a few days. I'm going to change my barrel to 1/2" and use AA batteries. Is there a way to make a magazine for AA batteries?

Thank you for all the feedback on the backpack :) I thought how annoyingly heavy a cannon with 2 chambers an a barrel would be.
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Unread postAuthor: veginator » Wed Dec 23, 2009 7:33 pm

bradisfun wrote:well that might not work as he has to be taking water from the bottom other wise the air will just come out the top, have a look at the followinghttp://www.thehalls-in-bfe.com/UberSoaker/ubersoaker.html

Well than couldn't you just wear it upside down?
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Unread postAuthor: bradisfun » Wed Dec 23, 2009 9:21 pm

probaly but some of the valves might not work with water (e'g: check valves..) and i dont think that the regulator would let water go thrugh at least not much and u would need a good nozle, and have a look at super soaker centrail (http://www.sscentrail.com,sry cant be botherd getting a link),im on there to.BTW if u want range then u need velocity. go figer
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Unread postAuthor: Lokoyo » Wed Dec 23, 2009 10:38 pm

I've made plenty of water cannons. I've always just loaded the barrel with water O.o or just get a hose and a couple fittings to attach it onto a barrel?

It's quite fun to shot this in water cause it keeps bubbling :)

Here is the Peacemaker MK2. It was designed originally to shoot water, which I ended up shooting some solid stuff cause it was fun xD

http://www.spudfiles.com/forums/peacema ... 17884.html
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Unread postAuthor: bradisfun » Wed Dec 23, 2009 11:03 pm

hey Lokoyo have u ever had a look at super soaker centrail?
if not i think u should,altho there homemades arn't very good!
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Unread postAuthor: Lokoyo » Wed Dec 23, 2009 11:10 pm

Yeah, but I haven't been on for a long time. I do recall that this website is really close to instructables and super soaker central. How ever, I'm not currently working on projects that are limited to just liquids.
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Unread postAuthor: bradisfun » Wed Dec 23, 2009 11:34 pm

ohk
well i have tought a bouth makeinga gun that will fire both
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Unread postAuthor: Lokoyo » Thu Dec 24, 2009 12:08 am

I recall I heard that a ball valve and a 4:1 CB Ratio was good. The ball valve because it good flow and it doesn't have to be fast cause the water is heavy (probably more true if you have a lot of water like my cannon which was about half a gallon) and 4:1 because you need plenty of air to push the water.
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