Or, glue in a tail platform that is flat in relation to the wing (zero degrees incidence) and that has a centerline marked accurately on it. Glue the V tail to the platform, lining up the dihedral break of the V with the centerline of the platform. Use a thin bead of 5-minute epoxy for this. Pin the V in place using two straight pins, one at the front and one at the back.

As the 5-minute epoxy cures, eyeball the tail tips from behind to make sure they both stay the same height in relation to the wing. (The wing is flat and level, an easy visual reference.)

When the 5-minute epoxy firms up, fill in the sides and top of the fuselage/tail joint using lightweight epoxy filler or spackling putty. The spackle isn't very strong, so saturate it with CA after it's dry. Then cover with the film or paint of your choice.

Duane Gall
RCPRO