After all the concerns about stability a larger rudder fin was drawn up.
Mine is twice the height of the original and flipped so more fin area is to the rear.
In the picture on the right the original rudder line pattern is the dashed line.
My re-draw is the larger solid lined fin.
The top shows the original smaller fin.
The inset shows the new larger rudder.
I also cut a new wider spine piece.
After sanding down the laser cut burnt edges I felt the spine wasn't high enough to match the thickness of the wings.
The slightly higher spine will allow me to sand it down to the top of the wings and require less seam filling.
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