Frogglicker, that is awesome. Let me confer with the user and see if this will work for him.Hey Roy.
Take a look at this and see if it will do what you need. I took the Krusty model and upscaled it for BT80 with a 24mm motor tube. The model is configured to use a 24mm MMT as a sleeve to protect the fin can from the motor heat. I have also included a 24mm retainer. It's untested. I pulled the measurements from OpenRocket tube entries, so it may need minor tweaking but I have had pretty good results with this method.
It could use a little more work b/c it's a little chunky. You might want to keep the infill perc lower.
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