Great Planes Ultimate Biplane 40 Kit - GPMA0240 - Manual (Page 9)

D 3. Remove the fin from your building board. Inspect all
the glue joints and add CA to any joints that don't look
strong. Sand the joints flush and the entire top and bottom
surfaces of the fin flat and even. Be careful that you don't
sand any area too thin.
D D 5. Remove the elevator from your building board.
Inspect all the glue joints and add CA to any joints that
don't look strong. Sand the LE,TE, root and tip flush. Sand
the entire top and bottom surface of the elevator flat and
even. Be careful that you don't sand any area too thin.
D 6. Go back to step 1 and build the second elevator
following the same procedure.
D 1. Pin the die-cut 1/4" balsa rudder bottom R-3 and
rudder tip R-4 over the rudder plan. Cut the rudder outer
frame from a 1/4" x 1/2" x 36" balsa stick, allowing
approximately 1/16" extra at the joints. Glue the outer
frame, rudder bottom and rudder tip together and pin it in
position over the plan. Use the plans or a straightedge as a
guide to make sure the rudder LE is straight as you glue
it in position.
D 1. Pin the die-cut 1/4" balsa fin bottom S-2 over the fin
plan. Cut the fin outer frame from a 1/4" x 1/2" x 36" balsa
stick, allowing approximately 1/16" extra at the joints. Glue
the outer frame and fin bottom together and pin it in
position over the plan. Use the plans or a straightedge as a
guide to make sure the fin TE is straight as you glue it in
position.
D 2. Cut the top two fin ribs from the remaining
1/8" x 1/4" x 36" balsa stick. Cut the bottom rib from a
1/4" x 1/2" x 36" balsa stick. Glue the fin ribs to the fin LE
and TE.
D 2. Cut the rudder ribs and diagonal braces from the
remaining 1/8" x 1/4" x 36" balsa stick. Glue the ribs and
braces in position.
D 3. Cut the remaining 1/4" x 1/2" x 36" balsa stick to
make the LE gusset. Glue the gusset in position.
D 4. Remove the rudder from your building board. Inspect
all the glue joints and add CA to any joints that don't look
strong. Sand the joints flush and the entire top and bottom
surface of the rudder flat and even. Be careful that you
don't sand any area too thin.
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