Dynaflite GPMA0090 Butterfly - Manual (Page 7)

7
accurately cut small balsa sticks (such as the ones
used in the tail surfaces) with a single-edge razor
blade rather than a hobby knife.
❏
2. Cut the fi n leading edge from a 1/4" x 1/4" x 24"
balsa stick, then pin it over its location on the plan.
❏
3. Cut the two base pieces and the tip of the
fi n from the same 1/4" x 1/4" balsa stick, then glue
them to the LE (leading edge) and TE (trailing edge)
with medium CA and pin them in position.
❏
4. Cut the two fi n “ ribs ” from one of the 1/8" x
1/4" x 24" balsa sticks, then glue them in position
over their location on the plan.
❏
5. Make the gusset for the corner of the fi n TE
and the base of the fi n from the 1/4" x 3/8" balsa
stick you used in step 1.
❏
6. Remove the T-pins, then lift the fi n from your
building board. We will instruct you to build the
dorsal part of the fi n
after you position the fi n on
the fuselage. Reinforce glue joints that don’t look
strong with medium CA.
Build the Rudder, Stabilizer
and Elevator
Use the following building sequence for the rudder,
stabilizer and elevator as a guide to cut the balsa
sticks and pin them to the plan, then glue them
together the same as you did for the fi n. Don’t
forget to cover the plan with wax paper.
Rudder Building Sequence
Refer to this photo while you build the rudder.
❏
1. The LE from the remainder of the 1/4" x 3/8"
stick used in step 1 of the fi n.
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2. The TE , then the bottom from a 1/4" x 1/2"
x 12" balsa stick.
❏
3. The “ balance tab ” part of the rudder and the
tip from the remainder of the 1/4" x 1/4" balsa stick
you used for the fi n and another 1/4" x 1/4" x 24"
balsa stick if needed.
❏
4. The “ ribs ” from the remainder of the 1/8" x
1/4" stick you used for the fi n.
❏
5. Remove the T-pins and lift the rudder from the
building board. Reinforce glue joints that don’t look
strong with medium CA.
Stabilizer Building Sequence
Refer to this photo while you build the stabilizer.
❏
1. The TE , LEs , tips , then LE “ brace ” from two
1/4" x 3/8" x 36" balsa sticks. To make the brace for
the LE, fi rst cut the 1/4" x 3/8" piece to a length of
4-1/4", then mark a centerline. Use a straightedge
and a hobby knife with a #11 blade to cut the angle
on the brace that extends from the centerline to
both corners.
❏
2. 1/8" x 1/4" x 24" basswood stab spar .
❏
3. The stab center (in front of and behind the
basswood spar) from the 1/4" x 1-1/2" x 3- 7/8"
balsa sheet.
❏
4. The stab ribs from 1/8" x 1/4" x 24" balsa sticks.
❏
5. Remove the T-pins and lift the stab from your
building board. Reinforce glue joints that don’t look
strong with medium CA.