Hook Up The Throttle - GREAT PLANES EXTRA 330S Instruction Manual

Hook Up the Throttle

FORWARD RADIO TRAY
AFT RADIO TRAY
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1. Determine which plywood radio tray you will be using–
the aft radio tray should be used for gas engine installations
because it positions the throttle servo, receiver battery and
receiver away from any potential RF noise that may be
generated by the engine. Using the aft radio tray also counter
balances the extra weight of a gas engine, reducing the amount
of any tail weight that may be required. For C.G. purposes, the
forward radio tray is recommended for glow engines. The aft
tray is recommended for electric motor installations.
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2. Once you have decided which radio tray to use, determine
which way you will be mounting the tray so the throttle servo
will be on the same side as the throttle arm on the carburetor
(for gas and glow engines). Note: There is an alternate throttle
servo location on the side of the engine box. Do not mount
your throttle servo on the engine box if powering this model
with a spark-ignition engine–all radio components (receiver,
Rx battery, switch, servos) in planes with gas engines should
be a minimum of 10" [250mm] from any engine components
(engine, module, ignition battery, ignition on/off switch).
Otherwise, electrical "noise" from the engine may cause radio
interference. If preferred, the throttle servo could be mounted
on the engine box for glow engines.
FORWARD RADIO TRAY
AFT RADIO TRAY
❏
3. Securely epoxy both 3/8" x 3/8" x 4" [10 x 10 x 100mm]
radio tray mounting rails inside the fuselage for the location
you will be using. The rails should be centered across the
horizontal members and approximately 1/8" [3mm] below
the top edge.
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4. Glue the plywood throttle servo mount doublers to
the bottom of whichever radio tray you will be using. Drill
1/16" [1.6mm] holes through the tray and doublers and
mount the throttle servo in the tray–as always, don't forget to
harden the holes with thin CA.
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