Chapter 9 -
Rudder
9.6 - Final closing - Bonding
Page 152
8.14
Final closing - Bonding
Test the fit of the left casing, noting any interference or other conflicts. When the
fit is satisfactory, drill two small holes (about 1/16 inches or less) near the trailing edge
of the top and bottom liner to aid in pin placement during gluing.
Locate, mark and prepare the bonding areas on the inside surface of the left
cladding. Excavate the core of the ribs and spar and place a dry MICRO paste along the
hollow edges. In the bonding areas on the left lining, apply epoxy to moisten these areas.
Apply a MICRO paste along the trailing edge of the liner mounted on the flat
surface (remember that weight in this area implies weight increase in the counterbalance).
Lay the left liner in place without slipping. Use the pins on the trailing edge for
alignment.
Place an angle bracket with weights over the lining bonding areas on the spar and
trailing edge, and weights on the ribs. THE ASSEMBLY WILL BECOME RIGID
AFTER THIS OPERATION, IN THIS WAY IT IS VERY IMPORTANT THAT NO
TWIST OR BENDING IS INTRODUCED IN IT.
8.14.1
Spar Front Lamination
Measure the BID width required to cover as a “U” channel flush with the hinge line.
Prepare 3-ply BID tape for the mold for “U” lamination along the hinge line length.
Using a MICRO paste, make small radii on the corners where the cladding and the
spar join. Roll out the face of the spar in a “U” shape.
The top hinge is located with its top face 2 inches from the bottom edge of the
counterweight and the bottom hinge is located with its bottom face 2 inches above the top
face of the installed rigid point. In this way, cut two additional pieces of 6-ply BID tape
with 12 inches long and 3 inches width. Glue these pieces centered on the hinge locations
(1.5 inch beyond each end of the 9 inch hinge section).