I soon will start on my latest cannon, my third. I've been thinking about it for a few days and have figured it out. It will consist of a 15 foot piece of 8inch Schedule 40 PVC cut in to three 5 foot lengths. They will be placed side by side in a roller cart. Each will be capped on one end with a schrater valve. On the other end will be a automatic modded sprinkler valve. After the valve on each the pipes will connect and form something like a _ _|_ _

so one pipe on one side, 2 connect on the other, and they go to a T pipe that is not glued in, so the barell that goes into it can move at a free 180 degrees.

It will have multiple barrel attachments ( not quite sure how to do that yet) and the 3 inch barelle will be 15-20ft long.

The reason for 3 pieces of the 8 inch pipe instead of one long piece is to allow me to either fire 1 shot withall the power, or 3 seperate shots at a 1/3 of the power.

The total chamber size will be about 8000cu in

Luckily i found a great irigation store that sells all this for real cheap, plus they give me the contractors discount which is 30% off!

I've included a drawing to give an idea of what it will look like.

Sorry how bad it is, im no artist

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