The actual set-up per CARF instructions were to block the chin parallel. Actually the tail post was made perpendicular first (side view), which required a little more shimming to the chin area to get the post vertical. The stab CL would then be set at 150mm above the surface, if I remeber correctly. Don't hold me to the 150 mm refernce, I don't remember what it was.
That set-up required a 33.5mm block under the post to get it right on. I had to get the fin and stab CL's perpendicular to each other first and then refernce the wing from that arrangement. The wing tube marks, as it turned out, wwere off. I used one mark as the refernce mark and adjusted the other side as needed to get the wing placed correctly in the fuse.
I never reference anything off the wingtube. It doesn't take much to build in a misalignment. I always make certain the tail post and stab are located properly then work the wing in
Hope that helps you,
MattK
ORIGINAL: KeithB
Matt, I'm not suggesting it should be changed to 40 mm, what I'm saying is that the 33.5 mm tail shim method you describe and the 30 mm below the center of the stab hole method that Andy describes do not come out the same for me.
Question on the the 33.5 mm shim method. Is the point of this intended to level the plane so the existing stab tube and anti-rotation pin location will be level, or are you moving the location that is used for the anti-rotation pin as Jason did?
KeithB