Zenoah TWIN GT80 Instruction Manual download pdf (Page 20)

Step 5. Using a Moto-Tool and a cut-off wheel, cut the bolt on

the side with the head so that 1" of thread remains exposed.

Step 6. Thread an A-nut (included with swivel clevis) onto each

side of the threaded rod and securely tighten against the rudder.

Step 7. Screw a molded swivel link onto each side of the 8-32

threaded rod so that it is tight against the A-nut.

Step 8. Hinge the rudder using the same technique as with the

aileron and elevator.

Step 9. Remove the stock servo arms and replace them with

heavy-duty 1

/4" arms. The arms need to be positioned as shown.

Step 10. Screw a 4-40 ball link 5 to 6 turns onto a 5" long

4-40 linkage. Screw the opposite end of the linkage into the swivel

control horn that was installed in Section 6. Adjust the length

until the hole in the ball link lines up with the outer hole in the

servo arm when the rudder is at neutral and the arm is centered.

Step 11. Using the 4-40 screws and nuts included in the

Rocket City package, attach the ball link to the outer hole in the

arm. The correct sequence is 4-40 screw, ball link, servo arm,

and 4-40 nut. (Don’t use the spacer/standoff.) Be sure to use

Blue Locktite

Step 12. Repeat Step 10 and Step 11 for the other rudder servo.

Section 7: Installing the Rudder, Control Horns,

and Linkages

CONTINUED

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Zenoah TWIN GT80 Instruction Manual Page 20