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| frocksie |
 Posted: 04/24/2008 22:55 PM Post subject: 1" Handheld Hybrid Cannon |
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Corporal
Joined: 23 Mar 2007
Posts: 69
24.27 Spud Bux
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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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Last edited by frocksie on 04/25/2008 9:18 AM; edited 1 time in total |
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| FordGtMan |
| Posted: 04/24/2008 23:02 PM Post subject: |
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1st Lieutenant
Joined: 25 Oct 2007
Posts: 251
188.37 Spud Bux
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Wow...  That looks amazing... I love that stock on there! Holy crap 25 lbs is a heavy gun 
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| THUNDERLORD |
| Posted: 04/24/2008 23:22 PM Post subject: |
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Loose Cannon
Joined: 28 Mar 2008
Posts: 647
1053.34 Spud Bux
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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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| OuchProgramme |
| Posted: 04/24/2008 23:34 PM Post subject: |
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Major
Joined: 12 Jan 2008
Posts: 374
534.55 Spud Bux
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Woah cool!
Try getting a nice sturdy bi-pod on it  .
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| frocksie |
| Posted: 04/25/2008 7:37 AM Post subject: |
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Corporal
Joined: 23 Mar 2007
Posts: 69
24.27 Spud Bux
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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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| bigbob12345 |
| Posted: 04/25/2008 8:33 AM Post subject: |
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Experienced n00b
Joined: 01 Dec 2007
Posts: 1514
362.74 Spud Bux
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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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| SpudFarm |
| Posted: 04/25/2008 8:39 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 1633
396.94 Spud Bux
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that looks good.
any damage shots? (from the milk jug)
what did you shoot?
any velocity things?
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| frocksie |
| Posted: 04/25/2008 9:29 AM Post subject: |
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Corporal
Joined: 23 Mar 2007
Posts: 69
24.27 Spud Bux
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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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| THUNDERLORD |
| Posted: 04/25/2008 12:33 PM Post subject: |
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Loose Cannon
Joined: 28 Mar 2008
Posts: 647
1053.34 Spud Bux
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| 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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| noob of noobs |
| Posted: 05/04/2008 19:04 PM Post subject: |
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1st Lieutenant
Joined: 12 Jun 2007
Posts: 281
496.63 Spud Bux
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| Looks great! Do you think having a long chamber like that is alright though considering DDT?
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| Ragnarok |
| Posted: 05/04/2008 19:36 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 1877
4582.53 Spud Bux
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@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...
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| DYI |
| Posted: 05/04/2008 20:06 PM Post subject: |
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Major General
Joined: 07 Jul 2007
Posts: 2109
2154.76 Spud Bux
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| Quote: | | 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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| ilovetoblowthingsup |
| Posted: 05/04/2008 20:08 PM Post subject: |
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Brigadier General
Joined: 30 Mar 2007
Posts: 823
1493.64 Spud Bux
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| yea i wouldn't be too worried about DDT if i were him
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| frocksie |
| Posted: 05/04/2008 20:49 PM Post subject: |
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Corporal
Joined: 23 Mar 2007
Posts: 69
24.27 Spud Bux
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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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| mattyp |
| Posted: 05/08/2008 1:16 AM Post subject: |
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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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