09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
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8.
Insert the lower rib, with doubler, into the bottom of the rudder and cleco it in
place above the tang on the rudder horn mount tube.
9.
Cleco and rivet left side of Rudder Skin to Ribs and Spar. Place Rudder, Left side
down on a flat surface and check for twist. Make sure Spar and Ribs are straight.
Use center line on the Rib flange as a guide to check alignment with side skin
holes.
10.
Check the rudder for twist. If needed, use boards and weights or straps to fix the
assembly and correct any error in twist. Transfer drill from the skin to the un-
drilled flange of the spar and ribs. Cleco as you drill.
11.
Transfer drill #11 through the rudder horn mount tube to the lower rib, and rivet.
12.
Rivet the skin to the frame/ribs and finish with the leading edge. Drill the leading
edge holes #30.
13.
Use a scrap piece of wood to slightly bend the edges of the skin around the spar
at the very bottom near the hinge. The purpose is to ensure the edge of the skin
does not contact the vertical stabilizer skin and to reduce drag slightly.
RUDDER TO VERTICAL STABILIZER ATTACH
NOTE:
The rudder must be installed onto the vertical stabilizer before the
whole assembly is mated to the tailcone. The horizontal stabilizer must be
mounted before the vertical/rudder assembly is bolted onto the tailcone as
the horizontal stabilizer will not slide into place with the rudder present.
1.
Ensure the bronze flange bushings are in place on both the vertical stabilizer and
rudder sides of the hinges. Ream the bus
hings to #11, if a 3/16” bolt will not
insert into the bushings.
2.
Slide the rudder into place on the vertical stabilizer and use bent needle nose
pliers or similar to insert the bolts into the hinges with the bolt heads on the top.
Take care not to ding or mar the skins.
3.
Use the appropriate hardware to secure.
4.
Once the rudder is mounted to the vertical stabilizer, the vertical stabilizer tip may
be fit up.
