Great Planes Giant Extra 330L Kit - GPMA0250 - Manual (Page 17)

Build the Rudder
❏ 1. Select the two rudder sheets you made earlier. Trim the
first sheet to size, using the 1" dashed lines on the plan as
a reference. Make the second sheet just like the first, and
set the second (left side sheet) aside.
❏ 2. Pin the right side sheet in place over the plan.
❏ 3. Glue the first die-cut 1/8" ply control horn support
(RHS) in position on the sheeting. Hint: Use the mini-plan
in the center of this manual as a handy reference.
❏ 4. Position and glue the die-cut 3/32" balsa rib VR1,
aligned flush with the bottom and leading edges of the
sheeting. Use a square to be sure the rib is vertical.
❏ 5. Position VR2 in place on the sheeting, aligning it with
the top of the control horn support and the leading edge of
the sheeting. Again use a square to be sure the rib is
vertical. Glue VR2 to the sheet and the control horn support
with thin CA. Hint: the shorter dashed lines extending past
the trailing edge of the fin are alignment marks to help you
position ribs VR2-VR8.
❏ 6. Position and glue the die-cut 3/32" balsa ribs VR3
through VR8 to the sheet as you did VR2.
❏ 7. Position and glue the left side control horn support into
its notches in VR1 and VR2.
❏ 8. Unpin the fin from the plan. Use a bar sander to sand
the TE of the sheet until it matches the angle of the ribs. Be
careful not to nick or break the ribs.
❏ 9. Trial fit the left side sheeting to the ribs. When confident
you can position it easily, coat the ribs, right side trailing
edge and left control horn support with medium CA.
Position the left side sheet, aligned with the LE of the ribs
and control horn support, the top and bottom rib and the
trailing edge of the right side sheet. Carefully weight the
rudder down and allow the CA to cure completely.
If you are going to double bevel your elevators, glue a
1/2" x 1-5/8" balsa spacer (not included) onto the leading
edge of the fin post from V1 down to the bottom of the post.
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