Great Planes Gee Bee Profile 40 Kit - GPMA0485 - Manual (Page 6)

D 1. Glue together the pairs of die-cut 1/8" balsa rudder
TE'S to make 1/4" thick parts.
D 2. With the waxed paper or Plan Protector over the plan,
pin the rudder TE'S in position over the plan. Cut the
rudder outer frame from 1/4" x 3/8" x 30" balsa sticks.
Glue the outer frame and rudder frame together and pin it
in position over the plan. Use the plan or a straightedge as
a guide to make sure the rudder LE is straight as you glue
it in position.
D 5. From a 1/8" x 1/4" x 30" balsa stick, cut and glue the
diagonal braces to the rudder frame.
D 6. 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.
D 1. Place the rudder over the plan and lightly mark the
hinge locations on the LE.
D 2. Mark the centerline on the rudder's LE using the
following centerline method.
D 3. From the 1/4" x 3/8" x 30" balsa stick, cut and glue
the two gussets and the control horn base to the
rudder frame.
HOW TO MARK A CENTERLINE
It's important that the hinges are centered and parallel to
the part you are hinging. The best way to start is by
accurately marking the hinge centerline.
D 4. From the 1/4" x 1/4" x 30" balsa stick, cut and glue
the rudder ribs to the rudder frame.
A. Lay the rudder and a ballpoint pen on a flat surface.
Mark a "test line" on the LE of the rudder.
B. Flip the rudder over and mark another line in the same
location as the first. If you see only one line, then it is on
center. Proceed and mark the centerline at each hinge
location. If you see two lines, use playing cards or business
cards to adjust the height of the pen until you can mark
the centerline.
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