Here you can see how the fins fit thru-the-wall and into the slots printed into the 3D engine mount.
The BT-5 tube had the seams filled with CWF.
On the left the tube top is squared up on a block with 320 grit sandpaper.
The inside ends of the tube were masked off to keep the filler/primer coat out.
The fins were separated from the balsa sheet.
On the right side -
The six fins were taped down for a good shot of filler primer.
Notice the root edges are butted against each other to keep off the primer for stronger gluing.
I tested the fit of a MicroMaxx motor.
The engine mount needed a very slight adjustment for a better friction fit of the engine.
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