Mini-Rocket

thingiverse

Mini-Rocket ========== Sized for a standard (24mm) Estes C11/D engine Separate nose cone with hook for shock-cord and parachute Fins chamfered for spin Fin retainer ring for added stability Large aft surface area provided by fins and retainer ring pull center of pressure behind center of gravity for stability given high-power engine and short length According to Makerware, Total Weight (without engine): 72g According to openrocket approximations: max height: 287m takeoff velocity: 17.2m/s velocity at deployment: 14.9m/s max velocity: 102m/s stability: 0.657cal (anyone who knows what that means, let me know - I couldn't find a clear/succinct answer) Designed not to need supports or rafts, minimizing assembly and printing time/material Thick walls (designed walls, not print shells) are sturdy for continued reuse (working on thinning a little bit to reduce weight and still print simply) Instructions I used the "standard" makerbot 2x settings for ABS: 10% infill, 2 shells, 230C extruders; my only changes were a 115C bed and 80 print speed - It always seems to stick a bit better. No raft and no supports. working on a still stable/still easy version with thinner walls. for now it still works and the best part is no raft and no support. The bottom is nice and smooth and I saw no curling, and any unsupported regions are on ≤45° angles so no support is needed (this is a lot easier than clearing out the inside of the tube afterwards) best of luck. smaller-engine version to come too.