Estes Curvilinear #3231, Build, Parts 6, Fin Gluing and Ring Fit

The CWF on the fins was sanded with 220 then 400 grit.

The root edges were sanded so any primer was removed. The area around the root edge were sanded a bit more than the fin faces for a good fillet bond.

The filler primer was scraped off and the fin lines re-drawn.

The trailing edges of the fins are even with the end of the tube.

After all four fins were glued on, the tail ring was test fitted. Don't glue on until after painting the ring.

I did have to use a folded over piece of 400 grit to clear the slots on two of the fins. Don't sand too much out of the slots, you want the balsa to fit close on the ring.