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1" Handheld Hybrid Cannon

Built a hybrid 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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1" Handheld Hybrid Cannon

Unread postAuthor: frocksie » Thu Apr 24, 2008 10:55 pm

As keeping with custom, I made some modifications to my hybrid and went handheld with it.

Specifications
Chamber--1' of 1" galvanized pipe
Barrel--4' of 1/2" Copper until I buy a 1" barrel
Valve--1" Burst Disk
Ignition--Camera Flash circuit dumped through Bosch ignition coil
Fuel--Propane
Mixes--4x

A Few Notes
I have only fired this once, as my pressure gauge broke, and I just shot a milk jug filled with water.

The stock is made of three pieces of 1/2" particle board glued together. I was out of plywoood when I made this, so I just went ahead and used the particle board. It has held together very well, although I should have used some nice marine plywood, and stained it.

The only downside to this gun is the weight. It must weigh 15 lbs, but a sling may be employed to make hip shooting easier.
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Attachments
electronical sys.jpg
meter.jpg
brick elct.jpg
meter right.jpg
Last edited by frocksie on Fri Apr 25, 2008 9:18 am, edited 1 time in total.
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Unread postAuthor: FordGtMan » Thu Apr 24, 2008 11:02 pm

Wow... :shock: That looks amazing... :shock: :shock: :shock: I love that stock on there! Holy crap 25 lbs is a heavy gun :D
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Unread postAuthor: THUNDERLORD » Thu Apr 24, 2008 11:22 pm

Looks like a nice blaster. good job making it handheld.
I never would have thought to use particle board for a stock but it looks like you've made the most of it.
Maybe you could coat it with some laquer or fiberglass for auto-body.

I wonder if the tank could be mounted somewhere else like in a back pack or belt to cut down on weight? Also if you leave it there you could fit it into a pvc(forget which size holder).
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Unread postAuthor: OuchProgramme » Thu Apr 24, 2008 11:34 pm

Woah cool!

Try getting a nice sturdy bi-pod on it :).
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Unread postAuthor: frocksie » Fri Apr 25, 2008 7:37 am

Thunderlord: I might put the propane bottle in a piece of 3" PVC and keep it where it is on the launcher.

I am pretty surprised that I could shape the particle board as well as I did, I thought for sure that it would just fall apart.

I just added a trigger guard and I will try to get a picture up soon.
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Unread postAuthor: bigbob12345 » Fri Apr 25, 2008 8:33 am

Very nice job
25lbs seems like a bit of an over estimation but I would image that to be quite heavy.
What is the recoil like?
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Unread postAuthor: SpudFarm » Fri Apr 25, 2008 8:39 am

that looks good.
any damage shots? (from the milk jug)
what did you shoot?
any velocity things?
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Unread postAuthor: frocksie » Fri Apr 25, 2008 9:29 am

I edited the original post, changing the weight from 20 lbs to 15lbs.

Bigbob: I can't really say what the recoil is like, as the one shot I did was flawed for a number of reasons.

-The pressure gauge had already broken, so I had no idea how much propane and air I injected, making it amazing that it actually fired.
-I had no aluminum foil, so I used the lid of a cream cheese tub as my burst disk, but it didn't really burst, it just developed a crack down the middle.

This may not seem to have a bearing on the recoil, but I wasn't paying attention to the recoil when I did this one shot, and the shot was delayed about 2 seconds after I flipped the switch, so it caught me off guard.

Simply said the recoil wasn't drastic or painful, just normal.
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Unread postAuthor: THUNDERLORD » Fri Apr 25, 2008 12:33 pm

Haven't seen this done yet but if you want to stick with the metal look there's a metal thinwall EMT Conduit (for electrical)pipe that would probably fit a propane tank.
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Unread postAuthor: noob of noobs » Sun May 04, 2008 7:04 pm

Looks great! Do you think having a long chamber like that is alright though considering DDT?
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Unread postAuthor: Ragnarok » Sun May 04, 2008 7:36 pm

@noob of noobs: I would say yes, it's probably safe from DDT.
The general consensus these days is that the DDT run up distance in propane/air mixes is long enough that a chamber would need to be impractically long relative to it's diameter for such a thing to occur, even at high mixes.

But in propane/oxy mixes, it's supposed to only be around 2 or 3 chamber diameters... :shock:
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Unread postAuthor: DYI » Sun May 04, 2008 8:06 pm

But in propane/oxy mixes, it's supposed to only be around 2 or 3 chamber diameters...


I don't quite believe that figure for some reason. I have a 2" x 24" chamber on a little mortar type thing I made, and it hasn't experienced any damage with a single ignition point at the front and 3x oxy/propane. Also, SB15's 15psi precharge (roughly 8x) oxy/MAPP hybrid with a 1.25" x 12" chamber never failed, bulged, or even cracked.
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Unread postAuthor: JDP12 » Sun May 04, 2008 8:08 pm

yea i wouldn't be too worried about DDT if i were him
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Unread postAuthor: frocksie » Sun May 04, 2008 8:49 pm

DDT never even crossed my mind when building this gun, because I wasn't going to use oxy/propane, or anything else along those lines.


Related to the gun, I hope to make a bipod in my tech class. A scope may also be in the cards, but I would need to mount it pretty high up.
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Unread postAuthor: mattyp » Thu May 08, 2008 1:16 am

great gun
just because of the weight a sling may work but you should mount it on a stand or a tripod that would be sweet
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