Great Planes PT-60 Kit - GPMA0119 - Manual (Page 19)

Preparation
D 1 Measure the total width of the stab (approximately
25") and make a mark at the exact midpoint of the TE. Use
a drafting triangle or a carpenter's square to draw an
accurate centerline on the top of the stab, starting at the
mark on the TE and extending to the LE.
D 2 Accurately measure the width of the fuse at the top of
F-3 and just in front of the stab base Mark the exact center
of the fuse top at both of those locations Lightly draw a
centerline between these two marks Stick a pin into the
fuse top at the F-3 centerline mark.
D 5 Now check the stab alignment by measuring from the
pin at F-3 to the stab TE at both tips Adjust the alignment
of the stab (while keeping the stab centered on the fuse)
until these measurements are equal Once you have the
stab pinned in c o r r e c t alignment, make a couple of
reference marks on the stab and the fuse, so you can
quickly realign the stab during the gluing operation.
Now proceed to align and attach the stab and fin as
follows:
D 6 Remove the stab from the fuse Mix up a batch of
30-minute epoxy and apply it to the stab base Lay the stab
in place and pin it back in correct alignment using your
reference marks Carefully remove any excess epoxy that
squeezes out of the Joint under the stab Recheck the stab
alignment carefully before the epoxy cures.
D 3 Lay the stab in place on the stab base and center it
as well as you can using the marks you made above Pin it
in place Lay a 36" straightedge (yardstick) on edge, across
the front of the wing saddle on top of the fuse, as shown in
the photo. Hold the straightedge in place by clipping a
couple of clothespins to the fuse sides behind the
straightedge
D 4. Check the alignment of the stab by standing 6 to 10
feet behind the airplane and crouch down until the stab TE
and the bottom of the straightedge are very close together
If the stab TE is not exactly parallel with the straightedge,
remove the stab and sand the stab base carefully with a
sanding block, then replace the stab and recheck its
alignment Note that you do not have to sand much to
make a big change in the stab angle Keep doing this until
the stab lines up very closely with the straightedge
D 7 Position the fin on the fuse top and stab with the
bottom of the "angled" rear edge even with the TE of the
stab, then pin it in place Check its alignment with the
centerline of the fuse with a long straightedge held against
the side of the fin The straightedge must be parallel to the
fuse top centerline Use thick CA to glue the fin in position
while holding a triangle against it and the stab to maintain
vertical alignment
19