Semroc V2 Build, Part 3, Fin Shaping

Here's the larger semi-scale fin.
If I were to use the smaller scale size fin, Semroc recommends an additional 1/2 oz. of nose weight along with the washer weight held in place by the screw eye. That seems like a lot of extra weight. I'll go the easier way out and use the wider fins.

Notice the pencil line at the root edge. This area to the left of the line remains square, the airfoil is to the right of the line.

The edge of the masking tape was blackened with a wide marker.

The strip was set on the pencil line, protecting the area to remain square.






Here the fin is held upside down.
The tape is used as a guideline for the edge of the sanding block. Be careful, you can sand off the tape.









Here's before and after pictures.

I did my standard wipe of medium CA glue down the leading (upper) and trailing (lower) edges.
A wide Sharpie marker is used over the area with the dried CA glue. The glue prevents the marker from being absorbed into the wood. The ink gives you a very high contrast making it easier to see the width of the sanded airfoil edges.