I've read a number of threads and still do not completely understand wing incidence. Firstly, how is it defined and secondly, how is it measured? If wing incidence is measured in relation to the fuselage, then where is the reference line on the fuse? In my way of thinking, it can't be arbitrary because you could end up with no difference between the wing and stab (zero decalage?), but could (exaggerating to make a point), be 90 degrees to the fuse (obviously absurd) and still have zero decalage (mono-wing, wrong term perhaps?).

Maybe I'm getting mixed up with angle of attack. Please help me understand this as I'm going nuts (already gone?). Thanks.

Marl