Gluing the couplings inside the chamber should significantly strengthen the areas which have screws/fittings threaded through them. I've used this method previously to achieve double layering near the center of 4" diameter chambers, and it does work well.

The rest of the cannon looks pretty clean ...

Thats a weird place to put a ball valve, but other than that not bad! For future reference, you can get those bell reducers pressure rated, but you gotta order them on line. They are a biitch to find locally. Its a combustion, so I wouldnt worry about the DWV pipe and fittings. Great job man, is ...

i didnt i only had 2 3" couplings and i cut one in half so i could use a double layer to hold a dual fan at the end of the cannon, and the second one i used for the mid section, where the ball valve goes in, just for security,

thanks i tried my best!

yes i sanded down the little nub the couplings had, took me a while to put them in the chamber! thanks for your input

the ball valve is on a double layer, the whole inner chamber has the couplings, i added since the pipe isnt pressure rated, couldnt find any,

Alright i finally did some rework on the cannon,
now the only problem is the chamber,
i really dont know where to get my pvc pipe clearly but let me know what you guys think!

stoj wrote:this is pretty cool

you should use clear pvc and fill that with the liquid

Not a bad idea! only problem now is that im currently working on a cannon that ive been breaking down and repairing over and over again

cammyd32 wrote:

along with another model which is pressurized and upon impact will spray bb's from the side but ill add that in another post

grenade launcher?

yes sir!

has anyone thought about putting the liquid in a capsule and shooting it?
i've made one but i'm really curious if anyone else has made such a thing?

i have filled empty pill capsules with the glow stick liquid and shot it out of a mimi combustion before, one of them hit a tree branch and made a ...

alright thanks i plan on modifying the fan placement also, having it held by rings inside the chamber not only that but by adding some thickness to the chamber

King_TaTer wrote:What bore size? Combustion or Pneumatic?

bore size = 1 1/4"
and it is combustion

the fans are located near the back,
and yes they are double layered, and as for the other 2 ill consider cutting that portion off since its by the cap,
the diameter for the chamber is 4" going down to the barrel which is 2" the length of the barrel is 3ft
and your definitely right about keeping ...

alright thats some good news,
and what about the screws? i have 2 holding the dual fan and 2 for the ignition

Alright guys i really need help on this, i just finished testing out my cannon, no flaws at the moment but i realized it may not be safe, i wanted to go with ABS instead of PVC but here and near the Mckinney area i cannot find ANY ABS, anyways, its a full PVC construction, Built in Twin fan ...

Goats spudz wrote:instead of putting it in a capsule wouldn't it make more sense to shoot the glowstick itself?

it would but it doesn't get the "splat" effect that a capsule has