Great Planes Extra 300S 60 Kit - GPMA0236 - Manual (Page 11)

❏
1. Make the LE using a 5/16" x 1/2" x 14" balsa stick
(leave 1/16" of length at both ends).
❏ 2. Make the balance tab using 5/16" x 1-1/2" x 2-3/4"
balsa sheet.
❏ 3. Make the rudder bottom from the remaining piece of
5/16" x 1" stick leftover from the elevator root assembly.
❏
4. Make the TE from the 5/16" x 5/16" stick leftover from
the elevator TE assembly.
❏
5. Make three rudder ribs using the remainder of the 5/16"
x 5/16" x 36" balsa stick.
❏
6. Make the cross trusses and rudder top cap from the
remaining piece of 1/8" x 5/16" remaining from the elevator
assembly.
❏
7. Using a leftover piece from the LE, glue the corner
gusset in place.
❏
8. Inspect all the glue joints and add CA where
necessary. Shape the bottom of the rudder as shown on
the plan. Sand the entire rudder flat and smooth with your
bar sander.
❏ ❏
1. Place the stab over its location on the plan and
lightly mark the hinge locations on the trailing edge with a
ballpoint pen. Mark the hinge locations on the elevators
using the same procedure.
❏ ❏
2. Cut the hinge slots in the elevator and stabilizer
using a #11 blade. Begin by carefully cutting a very shallow
slit at the hinge location to accurately establish the hinge
slot. Make three or four more cuts going a little deeper each
time. As you cut, slide the knife from side to side until the
slot has reached the proper depth and width for the hinge.
❏ ❏
3. Cut twenty four 3/4" x 1" hinges for the elevators
and rudder from the supplied 2" x 9" hinge material, then
snip off the corners. Temporarily join the elevators to the
stab with the hinges, adjusting any hinge slots if necessary
so they all align. Do not glue the hinges in place until
you are instructed to do so.
❏
4. Return to step 1 and use the same procedures to
hinge the rudder and fin.
❏
1. Shape the leading edge of the elevators to a “V” as
shown on the plan using a razor plane and bar sander.
❏ 2. Use the same procedure to bevel the leading edge of
the rudder. It will be necessary to sand the bevel at the top
of the rudder hinge line using your sanding block, because
the balance tab will not allow the razor plane to go the
full length.
❏
3. Use your bar sander and 150-grit sandpaper to round
the tail surfaces as shown on the fuse plan.
That’s about it for the tail surfaces. They’re a little more
work than sheet surfaces but they are much lighter, just as
strong, and a nice piece of craftsmanship. Clean off your
work bench and get ready for the wing!
Finish the Tail Surfaces
1"
1"
3/4"
Hinge the Tail Surfaces
Rudder Building Sequence
11