Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 18)

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6. Test fit the die-cut 3/32" balsa rear fuse bottom
between the fuse sides. Temporarily hold the bottom in
position with a few strips of masking tape.
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7. Install the die-cut 1/8" formers F-4 and F-5 in the
notches of the fuse sides and bottom. Be sure that the
antenna tube hole is toward the bottom of the fuse. Use
more masking tape to hold the formers tightly in position.
When you are satisfied that everything is square and true,
place the fuse on waxed paper, then wick thin CA into the
joints (from the inside) between the fuse sides, bottom and
the formers. As you apply glue, press down on the fuselage
to hold it square.
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8. Apply medium CA along all of the inside joints to
permanently secure the framework. Remove the masking tape.
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9. Cut the two 36" plastic outer pushrod tubes to 26"
for the PT 40 (24-1/4" for the PT 20). One tube will be used
as the elevator pushrod guide tube and the other will be
used as the rudder pushrod guide tube. Make the
antenna tube (optional) from any type of 3/16" pushrod
tube (not included). We recommend purchasing a Great
Planes 36" flexible pushrod set (GPMQ3710) and using
one of the outer tubes from the set. Save the scrap pieces
from the elevator and rudder tubes for use later.
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10. Sand the outside of each tube with 150-gr it
sandpaper so glue will stick to them. Slide the antenna
tube (if used) through the bottom hole in formers F-3, F-4
and F-5 and through the exit slot in the bottom of the fuse.
Slide the pushrod tubes through the upper holes in the
formers and out through the exit slots at the rear of the
fuse. All of the tubes should protrude about 1/2" past the
rear end of the slots. Use medium CA to glue the pushrod
tubes to each former and the exit slots.
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11. Use HobbyLite filler to fill the gap around the
pushrod tubes on the outside of the fuselage.
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12. After the filler has fully cured, sand the protruding
pushrod tubes and the filler so it is flush with the fuselage.
Skip step #13 if you will be using bolts to mount
your wing.
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13. Glue the die-cut 1/8" plywood front and rear dowel
triplers in position with medium CA.
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