Dynaflite GPMA0090 Butterfly - Manual (Page 8)

8
Elevator Building Sequence
Refer to this photo while you build the elevator.
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1. The LEs as shown on the plan, cut from a 1/4"
x 3/8" x 36" balsa stick. Use a hobby knife to cut
the “notches” for the 3/16" elevator joiner dowel.
Pin the LEs to the plan.
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2. The TEs and tip ends from the remaining
1/4" x 3/8" balsa sticks from previous steps. Do
not make the elevator root ends until instructed
to do so (the roots are the ends of the elevators
nearest the fuselage).
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3. Test fi t the 3/16" x 3-3/4" elevator joiner
dowel in the notches in the LEs of the elevators,
then if necessary adjust the notches so the dowel
is parallel to the TE of the stab on the plan.
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4. Glue the dowel in position with epoxy. Stick
T-pins into your building board in front of the dowel
to hold it against the elevators. Slightly raise the
dowel so it is centered in the LEs, then wipe away
excess epoxy before it cures.
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5. After the epoxy fully cures cut, then glue the
elevator root ends to the assembly.
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6. The elevator ribs from remaining 1/8" x 1/4"
balsa sticks, then the control horn base for the right
elevator from leftover 1/4" x 3/8" balsa.
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7. Remove the elevator from the plan, then add
CA to glue joints that don’t look strong.
Finish The Tail Surfaces
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1. See the note below, then use your bar sander
or a sanding block and 220-grit sandpaper to even
the edges and blend the ribs, LEs and TEs of all
the tail surfaces so they are fl at and smooth.
A note about sanding
“built-up” tail surfaces
Be careful when you sand a balsa structure
made up of “sticks.” The part fl exes and moves
while you sand and it can be diffi cult to keep your
sanding block fl at so you do not snag any of the
small ribs or over-sand one area and thin it more
than another area. Due to the design and slow
fl ying speed of the Butterfl y,
a perfectly smooth
fi nish is not necessary . For this model, the
purpose of sanding is just to remove any glue
bumps or uneven edges. Stop sanding when
you have reduced most of the high spots. Use a
large sanding block or a fl at bar sander and do
not apply much pressure while you sand. Enjoy
– it’s not a racing plane – it’s a fl oater.
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2. Use a ballpoint pen to mark the location of
the hinges on the control surfaces as shown in
the photo.
Note: The plan shows two hinges in each elevator
but use three as indicated in the photo.