RE: Katana ARF Fairings Question
Just make sure the front of the fairing lines up with the trailing edge of the wing, top and bottom.
Then put a straight edge (18" metal ruler works best) on the top of the wing at the top of the tip of the trailing edge and tight against the fuse and lay it on the h-stab.
Then mark your line. Then remove the monokote on the fairing and fuse where they butt up. The fairing is easy to remove. Just lift each color then run your razor down the fairing. Then epoxy it on with 10 minute epoxy. Again while it's drying have some alcohol ready. Make sure you line the front of the fairing up with the trailing edge, no brainer. Then put your straight edge on the h-stab to the top of the trailing edge again, tight to the fuse. Then move the fairing tight to the straight edge.
The incidence for the fairing, h-stab and ailerons are 0.