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22
Section 12 – Final Linkage Installation
Required Parts
• Fuselage
Required Tools and Adhesives
• 4-40 x 1/2" screw (3)
• 4-40 lock nut (3)
• Drill
• Drill bit: 3/32"
• 4-40 x 5" threaded rod
• Tapered standoff (3)
• Clevis retainer (3)
• Nylon ball link (3)
• 4-40 x 5
1
/
2
" threaded rod
• 4-40 nut (3)
• Nylon control horn (3)
• 2mm x 16mm (9)
• Threaded metal clevis (3)
• 4-40 x 3
7
/
8
" threaded rod
The technique for installing the control horns in the
elevators and rudder are similar to the aileron control
horn installation.
Step 1
Locate the metal clevis 4-40 nut, clevis retainer and
nylon ball link. Thread the 4-40 nut onto one end of a
4-40 x 5
1
/
2
" threaded rod. Slice a clevis retainer onto a
metal clevis and thread the clevis up against the nut.
A small amount of the rod will be visible between the
forks of the clevis. Tighten the nut against the clevis to
prevent it from loosening. Thread the nylon ball end onto
the other end of the threaded rod.
Note
: It is suggested that threadlock be used
on the nut and clevis to prevent them from
loosening during flight.
Step 2
Plug in the elevator servo and turn on the radio system
to center the servo. Place a Heavy-Duty Servo Arm
(JRPA215) on the elevator servo as shown. Trim the
servo arm to resemble the arm shown in the photo.
Step 3
Attach the ball end to the outside hole of the servo
arm using a 4-40 x 1/2" screw, tapered standoff and
4-40 lock nut. The standoff is positioned between the
ball end and control horn, which allows for smooth
operation of the linkage.
Note
: Attach the ball end on so it will be on
the outside of the control horn.