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Section 2: Installing the Aileron Servos
Parts Needed
• Left and right wing panels
• Servos w/mounting hardware (60 oz in minimum torque) (4)
• 6" Servo Extension (JRPA095) (2)
• 24" Servo Extension (JRPA102) (2)
• Y-Harness (JRPA133) (3 for non-computer radios) (2)
• 1" Servo Arms (HAN3574-JR or HAN3575-Futaba) (4)
Tools and Adhesives Needed
• Phillips screwdriver
• Drill
• Drill Bit: 1/16"
• Electrical tape
• Threadlock
Note: The ailerons require a minimum of 60 oz in of
servo torque. In the example used for this manual we
installed JR 8411 digital servos for the ultimate in
precision control. We have test flown the Sukhoi with
JR8101 and JR8231 servos with great results.
MatchBox Option: To simplify the installation of the aileron
servos, you may want to use the new JR MatchBox
matching/power system (JRPA900). Two MatchBoxes would
be used in this application—one for each wing. The MatchBox
allows easy adjustment of the servo's center and endpoints,
making aileron setup a snap. You can also use a seperate battery
to run the Matchbox, reducing the load on the flight battery
powering the receiver.
FAST FACTS: It is common to use two servos per aileron on
many larger models. This setup requires some special attention
to assure that the servos do not fight each other. If this is not
done correctly, battery consumption will be greatly increased,
and in the case of a high torque digital servo, the servos may be
damaged. When setting up the ailerons with two servos, there
are some special steps that need to be taken.
Step 1. Select two sets of servos and Hangar 9
have the same neutral. All servos will have a slightly different
neutral. If you are using Hangar 9 metal arms, they don't all orient
the same, (i.e., the splines are not oriented the same relative to
the arm). First choose one servo and arm, plug it into the aileron
channel on your receiver through the Y-connection, and set to
EXACT NEUTRAL, (i.e., servo arm is perpendicular to the servo
centerline). Next, start plugging in your other servos one by one
and installing the arms until you find one that is as close as you
can get to the EXACT SAME NEUTRAL as the other servo.
Repeat this process to find a second pair of servos.
Note: The arms need to face outward toward the
wing tips as shown Step 4. Be sure to use a drop of
threadlock to secure the servo arm screws if using
metal-geared servos.
Step 2. Install the servo hardware (grommets and eyelets)
included with the servo.
Step 3. Plug a 6" and 24" extension into each of the sets of
matched aileron servos. Tie a knot at the connector as shown,
then wrap with electrical tape to prevent the servo connectors
from pulling apart.
™
servo
Step 4. Insert the servo with the 6" extension into the aileron
cutout on the bottom of the wing closest to the wing root, as
shown below. Be sure the output shaft is oriented toward the
trailing edge of the wing with the servo arm pointing towards
the wing tip. Insert the second servo with the 24" extension into
®
1" arms that
the servo cutout located closest to the wing tip. Allow the servo
leads to exit the root of the wing.
9
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