Centurion Project, Part 6, Fin Fix

One fin had a broken tip on the trailing edge!
The old Centuri instructions suggest sanding an airfoil shape to the fins after they are glued onto the body tube.
The Semroc instructions say: "Round all edges except the root edges (which will be glued to the body tube). The trailing edge and tip edge can be sanded to a taper for more aerodynamic fins. Be careful that the curve at the end of the root edge does not get broken off. It is fragile until glued to the body tube."
The Estes Cosmic Explorer say to round only the leading edge. Because that trailing edge is delicate, I'll only round off the leading edge.

That broken tip edge was ragged.
FIX: For a flatter gluing edge, the tip was squared off using a sanding block.
Save the leftover balsa from the laser cut sheet for moments like this. A small triangle was cut and glued onto the tip.

After it dried, the tip was shaved down closer to the root edge line of the fin. The root edge was evened up with a sanding block.

Sanding this inside curve could be tricky, you don't want to break it off again.
TIP: Stack all three fins with the repair fin in the center. the outside fins will support the tip and give you a sanding template to follow.

Wrap some 400 grit around an dowel and carefully sand the tip down to the other fins contour.