vertical fin is started
To start, the bottom of the fin is curved to follow the upper curvature of the stabilizer. I know purists will howl, but I bent the spruce using the "soak in boiling water for two hours" method. It worked just fine.
Here are the two pieces in the jig.
Then the main pieces were cut from the Spruce stock. Here's the fin leading edge being sanded to a 3/8in. radius.
The top of the rear spar tapers from 1 in. to 9/16 in to meet the leading edge.
Thankfully, Doc Hood made some really great full-sized fin drawings. Here's the structure with the blocks in place and waiting for the curved lower section to dry.
Expect more on the weekend