Have you struggled over how to fit the fairing on the bottom of the rudder without have a big square hole open? I've seen a number of ways to deal with the opening. Here's one way to fill the opening that still allows you to make the rudder bottom removable.
When you are fitting the triangular brace to the bottom rib and the large angle, fashion a couple filler pieces out of scrap aluminum. I use .063 aluminum here because the fiberglass fairing tends to be about that thickness. Cut the filler pieces long enough so that you can rivet them to the triangular piece.
Now when you fit the bottom, just cut a square opening that fits tightly to your filler pieces. This gives a nice clean look and you don't have to worry about filler cracking, or a big ugly hole anymore.
Tip: Rudder Bottom Fairing
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