Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 25)

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5. Check the alignment of the stab by standing 6 to 10
feet behind the airplane. Crouch down until the stab TE and
the bottom of the straightedge are close together. If the stab
TE is not exactly parallel with the straightedge, remove the
stab and carefully sand the high side of the stab base with
a sanding block. Then replace the stab and recheck its
alignment. You do not have to sand much to make a big
change in the stab angle. Keep making adjustments until
the stab lines up with the straightedge.
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6. Double 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.
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7. Once you have the stab pinned in correct alignment,
use a ballpoint pen to make reference marks on the
bottom of the stab.
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8. Remove the stab from the fuse. Mix up a batch of
30-minute epoxy and apply it to both the stab base and the
stab between the reference marks. Reposition the stab on
the fuse using the reference marks. Use T-pins to clamp the
stab in position and recheck the stab alignment. Wipe away
any excess epoxy before it cures. Allow the epoxy to fully
cure before proceeding.
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9. Place the fin and rudder on the stab. Slide the fin
forward until the leading edge of the rudder contacts the
end of the fuselage. Make sure the rudder does not
interfere with the up and down movement of the elevator.
There should be 1/16" clearance throughout the entire
movement of the elevator. Enlarge the partially round cutout
in the rudder if necessary.
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10. Position the shaped balsa dorsal fin on the fuselage
and test fit it to the front of the fin. If necessary, adjust the
angle of the aft edge of the dorsal fin until it perfectly
matches the fin.
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11. Glue the dorsal fin to the stab on your flat building
board. Reposition the fin (now with the dorsal fin) on the
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