Great Planes P-51D Mustang 40 Kit - GPMA0175 - Manual (Page 28)

D 5. With the fuselage upside down on a flat surface, trial
fit the wing into the wing saddle. If the wing is slightly too
large (front to rear) to fit into the saddle, sand the rear edge of
the saddle and the wing trailing edge slightly until it fits with
approximately 1/32" to spare.
Measurements must be equal
D 6. Carefully align the wing in the saddle as follows:
If you have drilled the dowel holes accurately, the wing
should now be centered, side to side. Measure down from the
bottom of both tip ribs to the flat surface. If the measurements
are not equal (within 1/16"), sand the saddle slightly until the
wing sits level in the saddle. Also measure from the rear
comer of each wing tip to the tail end of the fuselage. These
measurements must also agree within 1/16". If not, shift the
wing slightly until they do. With the wing in this position you
may now check the wing incidence using an "incidence
meter" or by measuring down to the flat surface from the
center of the leading and trailing edges. The measurements
should be the same (zero degrees incidence). CAUTION: If
your flat surface is not level, you will get erroneous incidence
readings! If you are working on a flat surface that is not level,
you must set the wing incidence the same as your flat surface.
D 7. After making the necessary corrections to align the
wing, tack glue F-2A to F-2 with a couple drops of medium
or thick CA. Also make alignment marks on the wing TE
and the front of F-4B so you may easily re-align the wing
later.
D 8. Remove the wing and securely glue F-2A in place by
flowing thin CA into the wing dowel holes and around the
edges. Follow up with thick CA around the edges.
D 9. Drill 1/4" holes through F-2 using the holes in F-2A as
a guide.
D 10. Use a pliers to grasp the ends of the wing dowels and
pull them out. Now you may slightly round (or chamfer) the
ends of the dowels for easier insertion into F-2A. Mix up a
batch of 30-minute epoxy (for maximum strength), use a
small stick to work plenty of epoxy into the dowel holes,
smear epoxy on the dowels, then re-insert the dowels into the
wing, leaving them protrude 3/8". Wipe away all excess
epoxy, then allow the epoxy to fully harden.
D 11. Study the wing plan to determine where the wing
bolt holes are to be drilled (see the following sketch). By
measuring, transfer the locations to the wing bolt plate on the
bottom of the wing. After marking the bolt locations, replace
the wing in the saddle and re-align it accurately, as in step 6.
1/16" WING BOLT PLATE
D 12. Holding the wing firmly in place, drill 13/64" holes
at the locations you marked in step 11, drilling down through
the 1/16" ply wing bolt plate and through the 1/4" ply hold-
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