Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 22)

❏ ❏ 32. Glue the bottom leading edge sheeting in place the
same as the top.
❏ ❏ 33. Install the bottom TE and aileron spars.
❏ ❏ 34. Make and glue the center sheet and TE sheeting in
place the same as you did the top.
❏ ❏ 35. Glue the die-cut 1/8" ply servo mount (ASM) to the
spar and the tube end cap.
❏ ❏ 36. Sheet over the servo mount with leftover 3/32" balsa.
❏ ❏ 37. Set the wing right-side up on the building board.
From a piece of leftover sheeting, make a sheeting
support for the inboard side of the aileron servo tray.
Carefully sand the airfoil shape onto the top of the support.
Glue with thin CA. Make and glue a second sheeting
support for the trailing edge of the aileron servo tray.
NOTE: Be careful not to change the shape of the sheeting
when installing these supports.
❏ ❏ 38. Use a hobby knife to cut the opening for the servo
in the sheeting, using the servo mount as a guide.
HINT: While the wing is right-side-up, use a hobby knife to
cut just the corners of the servo opening. Turn the wing
upside-down again, and use a straightedge to cut straight
lines between the 4 corners you marked. Remove the piece
of sheeting.
❏ ❏ 39. With the wing upside-down, fit the aileron servo in
place and trim the sheeting around the rubber grommets on
the servo.
Note: Provide approximately 1/16" of clearance between
the servo and the sheeting.
Twin Servos Option
Before you continue, you must decide whether you are
going to use one aileron servo per aileron or two. All parts
and instructions are provided for either configuration. If you
have chosen not to purchase high torque servos with at
least 100 in oz of torque, we strongly recommend utilizing
twin servos for the safety of your model. Alternatively, if you
intend to exceed the recommended throws and utilize this
model for 3D or freestyle aerobatic competition, we strongly
recommend using twin aileron servos. Twin servos offer you
not only redundancy, but also additional rigidity for the
surface, decreased possibility of flutter, and more
consistent response under heavy aerodynamic loads. You
should note that sufficient room is provided for 45° throws.
Please read the Great Planes booklet: “A Look at
Aerobatics” for more information.
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