Page 13
Before you cut the covering for the elevator control horn
make sure you have the correct elevator half. (If you cut
open the servo pocket in the left side of the fuselage
make sure you are working with the left elevator half.)
Install the elevator control horn using the same process
used when assembling the aileron control horns.
Use a covering sealing iron to bond the covering in the
area the control horn will sit. Trim the covering away to
expose the slots. Try to avoid cutting into the bulsa
surface below the covering
Test fit the control horn halves in the slot individually,
then as an assembly. They should fit snug.
Check the alignment of the control horn to the hinge
center line as you did with the wing. The linkage hole in
the control horn should be aligned with the hinge
centerline.
With the control h
orn in position apply painter’s masking
tape around the control horn base. Put the tape up to
the base edge. Not under or over it.
Assemble a ball link rod end to the control horn using a
supplied machine screw and nylon lock nut. (Assembling
the ball link to the control horn at this step will help keep
the control horn halves parallel during installation.)
Remove the control horn leaving the tape in position.
Using a new hobby knife blade lightly cut through the
covering but not into the balsa sheeting. Cut inside the
tape edge about 1/16”.
Use sand paper to roughen the lower portion of the
control horns on both sides. Roughen one side of the
base plate. This will help the epoxy bond to the control
horn parts.
Apply epoxy into the slots in the elevator. Use a pin to
help push some epoxy in. Apply epoxy to the control
horn assembly and insert it into the slots.
