Shaping Estes Nike Smoke Fins, Part 2

You can't effectively shape fins like this with a sheet of sandpaper taped down to your work table. You've got to use a good sanding block.
I have 220 grit stuck to my Great Planes E-Z Sander.

The fins taper from 1/8" at the root edge to 1/16" at the outside edge. Concentrate on this taper first.

The white piece of paper shows the sanding area to concentrate on.
Straight back and forth passes with the sanding block from the root edge to the outside edge.

The inset picture shows the outside edge against the root edge of another fin. Set the sanded fin over the thicker root edge and sand until it is 1/2 the thickness of the 1/8" thick fin.

This picture is looking down the leading edge after getting the 1/16" outside edge to the correct thickness.
The fin sides are a little curved, not completely flat yet.
A few more passes of the sanding block got the sides flat.