15
HOOK UP THE THROTTLE
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1. Using a 1/16" drill bit, drill four holes for the throttle servo
tray. Install the tray using four #3 x 3/8" self-tapping screws.
Remember to use thin CA to harden the threads in the wood.
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2. Install a servo arm onto the throttle servo. Place the throttle
servo into the fuselage. Slide the 20" [508mm] pushrod wire
through the hole in the fi rewall and into the fuselage. Align
the hole at the end of the arm with the pushrod wire. Using
the hardware that came with your servo, mount the servo to
the tray. Once the throttle is installed remove the pushrod wire.
Two-Stroke Hookup
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1. Install the 17-3/4" [450mm] nylon pushrod tube through
the hole in the fi rewall, along the side of the fuel tank and into
the servo bay. Cut the nylon pushrod tube so it extends from
the fi rewall by at least 1/4" [6mm]. Roughen the end of the
tube with 180 grit sandpaper. Apply a couple of drops of CA
glue where the tube passes through the fi rewall and formers.
Throttle
Servo
Firewall
Clevis
Carburetor
Arm
Throttle Guide Tube
90° Pushrod Connector
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2. Hook up the throttle using the 20" [508mm] pushrod
and a nylon clevis on the carburetor arm. The location of the
carburetor arm may vary between engine brands so you may
need to cut a new hole in the fi rewall for the guide tube that
aligns with your carburetor arm. If you do, mark the location
of the new hole, remove the engine if necessary, and then
use an extended 3/16" [4.8mm] drill (available at hardware
or home improvement stores) or a 3/16" [4.8mm] brass tube
sharpened on the end to cut a new hole in the fi rewall. Install
a nylon clevis onto the threaded end of the pushrod wire
approximately 20 turns. Slide a silicone clevis keeper over
the clevis. Install the pushrod wire into the pushrod tube and
attach the clevis to the carburetor arm.
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3. Connect the throttle pushrod to the throttle servo using
a nylon Faslink in the same way as you did with the ailerons.