Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 39)

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1. Glue the fiberglass cloth to the center section of the
wing with thin CA. Start by tacking one end of the cloth to
Reinforce the Wing
EXPERT TIP EXPERT TIP EXPERT TIP
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3. Use your bar sander and 220-grit sandpaper to
bevel the sides and front of the top edges of the die-cut
1/16" plywood wing bolt plate (see the photo at step 4).
The side of the plate with the scored centerline is the
bottom.
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4. Drill a 1/16" hole through the punch marks in the
wing bolt plate. Carefully “crack” the plate along its
scored centerline – try not to break it in two. The plate
should “bend away” from the scored line. Hint: Use your
#11 knife blade to lightly score an additional centerline
on the
top of the plate.
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5. With the wing on the fuselage and in alignment as
described in step 2, use medium CA to glue the wing bolt
plate to the top of the wing. Note: The aft edge of the
plate should be even with the trailing edge of the wing
and the sides of the plate should align with the sides of
the fuselage.
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6. While holding the wing securely in position, use a
#10 or a 13/64" drill bit to drill through the wing protector,
the wing, and the wing bolt plate in the fuselage. See the
Expert Tip below and try your best to keep the drill
perpendicular to the top surface of each wing half that
you drill through so the heads of the bolts will be even
with the wing when tightened down. IMPORTANT: Do
not allow the wing to shift during this procedure.
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7. Tap threads into the wing bolt plate with a 1/4-20 tap.
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8. Apply several drops of thin CA to the threads in the
wing bolt plate. Allow the CA to cure thoroughly, then
re-tap the threads.
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9. Test fit the wing to the fuselage with two nylon
1/4-20 wing bolts supplied in this kit.
39
The most accurate way to make sure the holes you drill
for the wing bolts are perpendicular to the top surface of
the wing bolts are perpendicular to the top surface of the
wing is to make a drill guide. You’ll need a drill press so
if you don’t have one, beg or borrow (don’t steal)
a friend’s.
B. Position the drill guide and drill the #10 hole through
the wing and the wing bolt plate in the fuse. The drill
guide will accurately “steer” the drill toward the bolt plate.
Remove the wing and drill the clearance hole in the
wing with the 17/64" hole in the drill guide.
Now the holes on the wing and the bolt plate will be
perfectly aligned and the wing bolts will fit squarely on
the wing when tightened.
A. Use a drill press to drill a perpendicular #10 (or
13/64") hole and a 17/64" hole in an approximately 1" x
2" x 2" hard wood block.