You will have to cut some
areas of the rudder fin and the
one-piece-stab to accept the
rounded leading edge of the
rudder. These cutouts could
not be molded in for production
reasons.
Cut both parts according to the
photos, assemble the parts to
confirm sufficient clearance, so
that the rudder can move
without hitting any other part.
Better make these cutouts too
big rather than too small.
Now install the Robart hinges
into the rudder. You have done
this with the ailerons
successfully, so go ahead and
do the same thing with the
rudder now.
As the rudder is wider, the
slots, which give the hinges
clearance to move, must be
longer as well.
To recall, drill the holes with a
5 mm drill bit, open the holes in
the fiberglass with a small
round file to ret oval slots, and
insert the hinges with epoxy
glue. (Do NOT use CA glue!!!)
Then make the cutout for the
torsion linkage. This linkage is
inserted from the front, so cut
the leading edge of the rudder
accordingly to the shape of the
torsion linkage. Mill a 2 mm
wide slot in the wood spar of
the rudder, and insert the
torsion linkage with plenty of
epoxy glue. See dimensions
given in the photo.
20 mm
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