My team is currently looking at building a t-shirt cannon, and no surprise we are looking at arguably the greatest of them of all. From their build blog, we have gained much valuable information, but we still have a few questions?
- How does 254 roll their shirts? 2.375 ID seems really small. Why not the ranger roll?
- 200 shirt capacity, isn't that excessive and expensive? Or is it for the convenience of not charging the air tanks all the time?
- How difficult is it to add a rotating barrel? How is the barrel mechanism sealed to the air hose interface? Any closeups?
Thanks.
This is just one example of why you MUST NOT make engineering decisions based on assumptions. You should check/measure your parts and make appropriate design adjustments. - Stu Bloom [more] 
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