New Way Lunar Jumper Build, Part 4, Balsa Fin Prepping

After removing from the laser cut balsa sheet,

here's the fin tips with the fins set side by side. The trailing edges are even.

Cut off the uneven front end square with a razor blade.

All laser cut fins are a "wedge" cut. The bottom surface cuts are wider than the top as the laser light is diffused while burning thru the balsa.

I always square up the fin edges holding the sanding block at a 90 degree angle to the flat face of the fins.

Here the sanding and squaring up is about half done. You're finished when the ash is sanded down and the lighter balsa shows across the edge. 

The fin leading and trailing edges are not rounded.

The trailing edge is cut in a round arc.

To sand it, wrap some 400 grit around an engine casing or whatever form you have that is round. I'm using a glue stick casing.