Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 24)

❏ ❏ 48. Sand the TE of the aileron sheet to the shape of the
ribs, as shown above. Hint: Blocking up the leading edge of
the wing so that the bottom aileron sheeting is flat on your
building board makes this task very easy.
❏ ❏ 49. Glue the top aileron sheet in position, aligning it
over the bottom sheet, and positioning and gluing in place
as you did the bottom sheet in step 43.
❏ ❏ 50. Place your wing upside down on your work surface.
Position a 3/32" x 4" x 36" balsa sheet against the center
sheeting and flush with the outboard edge of R3. Trim the
sheet slightly inboard of R1, making one aft center sheet.
Glue the aft center sheet to the ribs and spar, being careful
not to glue R3 to the aileron end cap. Note: If this is your
second time through this step, you will be using the leftover
3/32" x 4" sheet from the first wing, not a new 36" sheet.
❏ ❏ 51. Position your straightedge flush with the trailing edge
of the aileron sheet and extending inboard past R1. Trim the
aft center sheet flush with the rest of the trailing edge.
❏ ❏ 52. Turn the wing right-side-up. Sand the trailing edge of
the aft center sheet as you did the aileron sheet in step 46.
❏ ❏ 53. From the 3/32" x 4" wood left over from making the
bottom aft center sheet, position, cut and glue the top aft
center sheet. Note: Save the remaining 3/32" x 4" wood for
sheeting the second wing half.
❏ ❏ 54. Trim the trailing edge of the top aft center sheet
flush with the trailing edge of the bottom aft center sheet.
❏ ❏ 55. Sand all sheeting flush with R1 and R14.
❏ ❏ 56. Position and glue a 1/4" x 1-1/2" x 12" balsa wing
tip so that there is a small amount of overhang past the
leading edge, trailing edge, top and bottom of R14. Trim and
sand the wing tip to match the airfoil shape of R14.
❏ ❏ 57. Use a razor saw to cut the tabs off of the LE. Sand
everything flush with the LE web.
❏ ❏ 58. Glue a 1/2" x 1-1/4" x 48" balsa stick, the wing
leading edge, centered onto the front of the LE web. Sand
the ends of the leading edge flush with ribs R1 and R14.
Hint: By aligning your leading edge flush with the outboard
edge of one side of the sheeting, then drawing a line along
the other side of the sheeting, and pre-cutting the leading
edge to that line (being careful not to cut it too small), you
minimize the excess wood needing to be sanded.
Twin Servos Option
If you chose to install twin aileron servos, repeat steps 44
and 45, securing the second set of control horn mounts
against the outboard edge of R11.
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