Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 18)

❏ 10. From a 3/8" x 1-5/8" x 24" balsa stick, cut one 18-3/4"
long rudder LE. From the 3/8" x 5/8" x 9" balsa stick leftover
from making fin hinge blocks, cut three 1-1/2" long rudder
hinge blocks.
❏ 11. Lay the LE on its 1-5/8" wide side on the plan as shown
in the photo, with its top aligned with the top of the rudder on
the plan, thereby allowing the small excess to overhang the
bottom. Glue the three hinge blocks centered on the LE post
in the positions shown on the plan.
❏ 12. Stand the sheeted structure vertically and centered
on the LE laterally and aligned with the top of the LE. Glue
in place with thin CA.
❏ 13. Trim and sand the LE flush with the sheeting, being
careful not to damage the sheeting. Sand the LE flush with
ribs VR1 and VR8, maintaining VR8’s angle.
❏ 14. Using medium CA, glue the rudder counterbalance to
the rudder LE, aligning the tops of VR8 with V7 and
centering the counterbalance’s TE on the rudder LE. Lightly
sand any imperfections in the fit.
❏ 15. Using leftover 3/32" balsa, glue a balsa cap onto the
top and bottom of the rudder. Sand the caps to the shape of
the ribs and sheeting.
❏ 16. Using giant scale hinges (not included), hinge the
rudder to the fin.
Note: The TE of the fin and the LE of the rudder will be
beveled after the fin is mounted on the plane.
That’s about it for the tail surfaces. Now, how was that for
lightweight, easy to build, airfoiled surfaces? They are light,
strong, scale, aerodynamic, and a nice piece of
craftsmanship. Clean off the building board and get ready
for the wings!
Right now, while the building board is clear, is a great time to
assemble the wing support jigs, wing sheeting and several
other important items in preparation for the wing assembly.
❏ 1. Select the die-cut 1/8" balsa WLEJA, WLEJB, WTEJA
and WTEJB support jig pieces. Glue WLEJA to WLEJB
and WTEJA to WTEJB using a straightedge to be sure the
jigs remain straight. These two jigs are now known as the
leading edge and trailing edge support jigs.
Assemble the Wing Jigs
BUILD THE WING
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