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RANS S-21 OUTBOUND
9.
Cleco the ribs in place to the top side of the skin. Use a short 2X4 or similar to
space the aileron off the table and prevent damage due to resting on the clecos
in future steps.
10.
Place the aileron with the bottom side up.
11.
Fixture or weight the aileron to remove any twist.
12.
The hinges must not contact the skin. Enlarge the slots in the aileron skin if
needed.
13.
Transfer drill using a #30 drill from the skin to the bottom flange of the ribs.
Reach in from the front and move the ribs as needed. Use the line drawn on the
ribs to ensure proper edge distance. Cleco as holes are drilled.
14.
Slide the aileron spar into place from either side and cleco the bottom leading
edge row to the spar.
15.
Rivet the bottom side using the appropriate rivets. Start at the trailing edge and
work your way forward one row at a time.
16.
Flip the aileron over and check for twist before riveting. Start at the trailing edge
and work forward.
17.
Match drill and debur the spar using the holes in the skin and a #30 drill.
18.
Finish riveting the skin to the spar.
The plugs for the mass balance are created using spray expanding foam.
1.
With the aileron flat on a table, insert the tube on the can of expanding foam at
least 14 inches inside the root side of the aileron spar. This will require use of an
extension tube or other means. Spray just enough to create a plug.
2.
Let the foam set up for at least 8 hours.
3.
Place the aileron on a flat table and allow it to rotate on the bottom of the hinges.
Add Lead shot or BB's to the root end of the spar until the aileron balances on
4.
the hinges when the bottom surface is level.
5.
Use expanding foam to create an end plug and isolate the balance weight in the
spar. If the foam expands beyond the end of the spar, wait until it completely
dries and cut it off flush with the end of the spar.
IMPORTANT: If the aileron is painted after it is balanced, it will need to be
re-balanced. Weight can be added by creating a cavity in the foam plug
using a drill or other means, adding BBs to balance, and sealing them in
with more expanding foam.
TEXT MANUAL
AILERON BALANCING
76
09/11/2018
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