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MAPP injected combustion V2.0

Built a combustion 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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MAPP injected combustion V2.0

Unread postAuthor: SpudBlaster15 » Tue Apr 10, 2007 10:31 pm

My MAPP injected combustion gun has been begging for some improvements in vital areas for some time now, so I finally decided to make some changes. Many of you have seen the first display of this gun, and I can tell you right now, I like it much more than I did previously. I don't intend to enter this in the contest, because the basic platform was an existing gun long before the contest was announced.

Specs:

Chamber: 4" x 16"
Barrel: 1.5" x 96"
C:B ratio: 1.2:1
Fuel: Metered MAPP gas
Mixing: 60mm CPU fan
Venting: 2" PVC ball valve
Ignition: Double gapped electronic BBQ igniter
Loading: 2" aluminum cam locks w/steel barrel ring supports

Pictures:

The gun with it's new look:

Image

Chamber view:

Image

Aluminum cam-locks, rated to 250psi, purchased for $12.

Image

2" Sch 80 PVC ball valve, rated to some ungodly high pressure, purchased for $6. The attachment method is a secret.

Image

Electronic BBQ igniter housed in a quick access handle configuration. This sucker throws out around 10 sparks per second.

Image

The steel barrel supports. They are 2" Sch 40 steel pipe nipples, which have the inside lined with cloth to allow the barrel to slide smoothly, and to prevent scratching of the barrel. I used steel to allow me to tighten the hose clamps extremely tight, without flexing plastic supports and locking them to the barrel, preventing movement.

Image

Thanks for looking.
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Last edited by SpudBlaster15 on Thu Apr 12, 2007 12:10 pm, edited 2 times in total.
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Unread postAuthor: hi » Tue Apr 10, 2007 10:34 pm

thats a sweet cannon.

can i guess what your "secret method" is that you used to attach the ball valve?

my guess is that you drilled a hole in the cap and glued it on. am i right?
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Unread postAuthor: SpudBlaster15 » Tue Apr 10, 2007 10:35 pm

Thanks for the compliment.

The end cap is ABS, and the ball valve is PVC. A glue joint wouldn't hold. Nice try though.
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Unread postAuthor: Velocity » Tue Apr 10, 2007 10:43 pm

Damn... nice clean gun!

Aluminum cam locks are the best... Even though I don't care if I have to muzzle load a projectile or not, they just make a launcher look so much better!

Long barrels are also sick... most people would chop the barrel at 60" on a gun like this, just to make it more ergonomic. But I am sure this 96" barrel packs a serious punch (I would have kept the long barrel too 8) ).

How is the ball valve attached? Hmm...

1) Threaded on with a pipe nipple?
2) Solvent welded with a short piece of pipe and something else on the other side of the clean out cap?
3) Magic?

Once again, awesome cannon... definitely one of the better combustions that I have seen.
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Unread postAuthor: Pete Zaria » Tue Apr 10, 2007 10:48 pm

Beautiful job. I have a very similar gun with two handles, a 1.5" vent valve, a spark strip, and propane instead of mapp. I'm going to use your idea for barrel supports, and see if I can find some of those camlocks.

Very very clean build. I love it. How's the range?

Peace,
Pete Zaria.
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Unread postAuthor: SpudBlaster15 » Tue Apr 10, 2007 10:56 pm

Thanks guys! I really appreciate these comments.

Rmich: You almost guessed it. It is attached using a method that uses aspects from the first two possibilities on your list.

Pete: I just finished the build today, and there is one cemented joint still curing, so range testing will commence tomorrow. Due to the lesser frontal surface area of the smaller 1.5" round, and higher velocity attained by the longer barrel and decreased projectile mass, the potato should go farther, and have more energy density upon impact. Range calculator V2.2 seems to agree.
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Unread postAuthor: ArticWolf » Wed Apr 11, 2007 12:06 am

Sweet Looking cannon I am going with a long barrel with mine but it is only half done Same style as yours but Damn Sweet cannon! Oh And I guess that it is treaded on the ball valve and welded to the end cap right. LOL.
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Unread postAuthor: Killjoy » Wed Apr 11, 2007 12:12 am

Wow that is an awsome looking cannon, kind of suprises me it used to be you old mapp one (I can still see the resemblince, but it looks a lot better this way).
I'm wondering if thats an actual clean-out cap though, because there looks to be about a 1/4" lip around the end of the female adapter;
So I'm guessing its

a) some sort of pressure rated plug, or
b)you reinforced the clean out cap with some sort of material, possibly to help support a pipe nipple the valve is threaded/cemented on to?
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Unread postAuthor: SpudBlaster15 » Wed Apr 11, 2007 12:21 am

It is a clean out cap.

I will now reveal the secret. I cut a hole in the center, then slid a 2" male threaded adapter through the back, and threaded the ball valve onto the protruding threads. I sealed the inside with some silicone sealant. It works great.

Once again, thanks for all of the positive replies.
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Unread postAuthor: locksmith » Wed Apr 11, 2007 11:14 am

Great job nice launcher
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Unread postAuthor: iPaintball » Fri Apr 13, 2007 5:05 pm

That is one of the nicest combustions I've seen to date... great work!
Where'd you get those camlocks from?
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Unread postAuthor: SpudBlaster15 » Sat Apr 14, 2007 1:32 am

The cam locks were purchased here, though I don't believe they are listed online.
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Unread postAuthor: souljahz_unite » Thu Apr 19, 2007 8:55 pm

that cannon looks awesome. the look is wicked. im building a basic on now for a startign project. maybe one day ill create a sick looking cannon like that :D until then ill settle with a basic combustion
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Unread postAuthor: sjog » Thu Apr 19, 2007 9:05 pm

Nice gun And those saddle cuts work great on your barrel supports
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Unread postAuthor: Bubba05 » Thu Apr 19, 2007 9:19 pm

That sir is a reallly nice gun!
Clean and BLACK!!

Bubba
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