Reply To: A theoretical exploration of physical possibilities, AKA Let's Make A Monster
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Sometime back I had the idea to make a springer cannon—wheeled carriage and all. I was looking at some steel tubing that had an inside diameter of three inches for the barrel. Then looking at some truck suspension springs gave me the idea for the springs. A long ram hydraulic jack for cocking the thing. Some other larger diameter tubing that the springs would fit into for the cylinder. And, . . . .
The stumbling blocks—nowhere near enough time, money, or facilities to make the thing.
As far as what you need to calculate is just a matter of scaling everything so that you wind up with the same pressures at the port as a smaller rifle. Your projectiles will need to have similar weights relative to a round ball as the smaller guns. That is, if the pellet weight is 1.4 times the weight of the same caliber round ball, then that is the proportion you want to use for your big bore.