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Step 3: Adjusting the Pushrods & Control Throws
❑ With your radio system plugged in and turned on, check to make sure the rudder, tail wheel and the rudder servo are
centered. Make adjustments to the clevises if necessary. Double-check that the rudder and tail wheel are moving in the
proper direction.
❑ Check the control surface throw by measuring from the
widest point of the rudder. The rudder should move both
right and left 1/2".
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Remember, you can adjust the control throws by moving the clevis in and out on both the control horn and the servo
arm. Moving the clevis toward the control surface will increase the control throw. Moving it away will decrease the
throw. Moving the clevis toward the center of the servo arm will decrease the control throw and moving it away from the
center will increase the throw.
❑ Using wire cutters, remove all but one arm from a "4-point" servo horn.
❑ Snap the nylon clevis (attached to the joiner plate assembly) into the second hole out from the center of the servo arm.
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You will have to enlarge the hole in the servo arm using a 5/64" drill bit so the clevis does not bind.
❑ Connect your radio system and plug the rudder servo into its proper slot in the receiver. Double-check that the rudder
trim lever on your transmitter is centered.
☞
To make the next procedure easier, you may want to unsnap the clevises from the rudder and steering control horns.
❑ Install the servo horn to the rudder servo, making sure
it's centered and points toward the elevator servo as shown.
❑ Slide the clear tubing up over the clevis and install the
servo horn retaining screw to secure the servo horn in place.
❑ Adjust the rudder and steering clevises until the rudder and tail wheel are centered. When satisfied with the
alignment, snap the clevises back into place and slide the clear tubing up over the clevises.
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