Hello William:

You can measure the angle of incidence of the airfoils by making a
cutout of the hot wire templates for BL 49 -- a "female" template if you
will -- and cutting the level line above the template. Then a digital
level will tell you what the relative angle of incidence is. You can
get the templates from Quickheads if you don't have them. If the
airframe is assembled that gives you the answer but if not you will have
to determine the angle of incidence of the fuselage -- dig in the plans
and read the old posts, sorry, not easy.

Mike