QuiQue's Aircraft Yak-54S Assembly Manual - page 14
Step 4
Check the gap on each control
surface. The gap should be
somewhere between 2 and 3 mm.
This procedure will take some time
to do all of the hinges but take your
time and do a nice job. As you do
each hinge and check out the proper
depth and shape of the V-slot
necessary for each hinge, the time
involved to do each subsequent
hinge will lessen.
Before you glue the hinges in
place:
Take some lithium grease or
Vaseline and apply a very small
amount on both sides of the hinge
point on the flat hinges. Quique used
a round toothpick. See Figure 12.
This will help prevent any glue in the
pivot point.
Be very careful not to get any grease
etc. on the flat part of the hinges.
Also remember that you always glue
the hinges in to the fixed surfaces
first, let the glue harden before you
then glue in the control surfaces.
Remember to check for the correct
hinge gaps for rudder, elevators and
ailerons. You must have the correct
gap to insure the maximum control
deflection necessary for the best 3-D
aerobatics. For hinge attachment we
like to use Hinge Glue by Pacer.
You may use epoxy if you wish. If
you use epoxy, use an epoxy with a
curing time that will give you enough
time to work the hinges in place
before the epoxy hardens.
Figure 12
Step 5
Sealing the Control Surfaces
After you are done hinging the
ailerons and elevators, make sure
you seal the hinge line by using clear
ultracote. Unsealed control surfaces
may cause flutter like aileron flutter,
which may cause your plane to
crash, where sealed control surfaces
will give you better and crisper
response in flight.
For each aileron, cut ¾”x32” of clear
untracote and seal the hinge line
from bottom using a straight edge
and trim iron.
For each half elevator, cut ½”x10” of
clear unltracote and seal the hinge
line from bottom same way as you
did your ailerons.
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