Dynaflite GPMA0090 Butterfly - Manual (Page 26)

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24. Make the front and rear “ windows ” from the
3/4" x 6-1/4" balsa triangle stock. Glue the windows
in the position shown on the plan, then sand the
sides of the windows so they are even with the
fuse and cabin sides.
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25. Use leftover 1/16" balsa sheet to cover the
back of the fuselage.
Install the Servos
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1. Cut two 2-1/2" sticks from the remaining 1/4"
x 3/8" balsa stick. Glue the sticks (centered) to the
ply servo rails .
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2. Test fi t the servo rails and your servos on the
servo rail supports in the fuselage.
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3. Position the rails so they support the servos
but allow enough space so you can remove the
servos when necessary. Glue the rails to the fuse
sides and the rail supports with medium CA.
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4. Install servo arms onto your servos, then
position the servos on the rails as shown in the
photo (not on the plan) . The one-arm servo horns
shown in the photo are cut from six-arm servo
horns. The throttle servo arm has been shortened
by “cutting off the outer hole.” Drill 1/16" holes in
the servo rails, then mount the servos to the rails
with the screws included with your servos.
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5. Optional: Drill or cut a hole in the back of
the fuselage and install a pushrod guide tube (not
included) to serve as an antenna guide. The front
of the tube should extend approximately 1" in front
of the servos. Glue the tube to the formers and the
aft 1/16" sheeting, then sand the end of the tube
so it is fl ush with the 1/16" sheeting.
Align the Stab and Fin
Align the Stab
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1. Temporarily fasten the stabilizer to the fuselage
with T-pins. Use clothespins or clamps to hold a
long straightedge on the wing saddle portion of
the fuselage (the tops of the cabin sides). Stand
behind the airplane and view the stab and the
straightedge. If necessary, remove the stab and
use your bar sander and 150-grit sandpaper to
sand the top edges of the fuse sides so the stab
will lie fl at and parallel with the straightedge.
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2. Accurately mark the center the top of the stab,
then use a square or a 90-degree triangle to mark
a centerline that extends from the leading edge to
the trailing edge.