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Saturday, August 25, 2018

NARAM Egg Lofter Build, Part 8, Fin Airfoil Shaping

The fins were made using 1/32" thick plywood. I was able to cut them out with scissors, something you couldn't do with balsa.

Mentioned in an earlier build, you can easily gauge the thickness by seeing the ply layers as you sand the airfoil.


The fins got a wipe of CA and smooth sanding with 400 grit.

Notice there isn't any CA glue near the root edge. I wanted the fillets to better adhere to the body tube.
Here's how the first attempt looked before I realized the altimeter and pop lug problems. Too bad, the long shroud would really smooth out the air stream.

The fins were cut off to be reused. The body tube and shroud were thrown away.

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