We chose this design because we believe that with the cumbustion chamber being smaller it will have less space to combust therefore creating more pressure. We then made the barrel 1.5 times bigger than the cumbustion chamber because after various research we found that the ratio should come out so that the barrel is 1.5 times bigger than the cumbustion chamber.
The drawing is very visually "savvy" with good deatils and structure. Your drawing is very ideal to how the cannons should be. Good luck!!
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