My next build is going to be a short, fat rocket. I will be using 4" Blue Tube left over from my L2 scratch build, and 1/4" Baltic birch for fins/rings/bulkhead. My plans are to make it an easy sport flyer, no electronics (other than a simple Jolly Logic for altitude), and zipperless design (despite the best simulations, planning for the inevitable 'hard opening'). My current design in OR has a 54mm motor mount with enough length in the fin can for a 3-grain CTI case. With that configuration and using the nose cone space for chute/harness packing, I think I can make it as short as 60-65cm (close to a 6:1 length to diameter ratio). I recognize I will need a significant amount of nose weight to fly a 3-grain 54mm motor to get a safe stability margin, even with the increased influence of base drag. Given the penalty of needing to add a lot of nose weight, would I be better off to drop down to a 38mm motor mount? For those of you with fat and short rocket experience (and observation) let me know your thoughts.