Section 7A - Rudder Servo Installation: Pull-Pull - Hangar 9 showtime 4d 90 Assembly Manual

Section 7A – Rudder Servo Installation: Pull-pull
Required Parts
• Fuselage assembly
• 8-32 flange nut (2)
• Molded swivel link (2)
• Threaded cable end (4)
• 8-32 x 4" control horn screw
• 4-40 x 1/2" socket head screw (2)
Required Tools and Adhesives
• Threadlock
• Hangar 9 3D XL Full Servo Arm 4-40:JR (HAN3576)
The rudder requires a minimum of 120
ounce inch of servo torque. In the prototype
ShowTime we used JR8411SA servos with
excellent results. Using servos with less torque
could result in blowback.
The ShowTime has two options for mounting
the rudder servo. For lighter engines a pull-
pull system is used. For heavier engines a tail-
mounted servo is used. Use the appropriate
servo location based on your engine selection.
 Step 1
Slide the 8-32 x 4" control horn screw into the hole in
the rudder. Thread the 8-32 flange nuts onto the screw
from both sides of the rudder. Position the screw so it
is centered in the rudder. Use threadlock on the nuts to
prevent them from loosening during flight.
• Cable
• 4-40 locknut (2)
• 4-40 ball link (2)
• Ruler
  Step 2
Cut the cable into two equal pieces. Prepare one end of
the pull-pull cable using the cable, threaded cable end
and crimp. The cable passes through the crimp, through
the threaded end, then back through the crimp twice.
Pull the excess cable tight and use a crimping tool to
complete the job.
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