3-inch Big Red Max Fin and Centering Rings
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Big Red Max Fin and Centering Rings
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- Printables
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- RC & Robotics
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- Creative Commons — Attribution — Noncommercial — Share Alike
This is a partial builder's kit for a printed Der Big Red Max. I used the dimensions from an upgrade kit that replaces the balsa fins with 1/8-inch (3.2mm). I also created three different centering rings:
- Forward: Has a 6mm hole and a 3mm x 15mm cut-out for using tubular nylon as your shock cord.
- Mid: has cut-outs to accommodate mating cutouts on fin
- Aft: Simple ring
These rings are for a 3-inch, Estes body tube and will accommodate an Estes 29mm motor mount tube.
The fin is as seen in the drawing but I have made it ¼-inch wide (6.3mm). Because of the airfoils, I printed it standing up with minimal supports on the bottom of the root edge without issue. My best suggestion is to ramp up your quality and just go low and slow. In high-res, it took about 20hrs/each for me. The rings, with 100% infill, were just under 12 hrs.
All parts were printed in PLA+ but ABS would work just as well.
I haven't flown this yet but plan to in the next few weeks.