Futaba S9155 Digital High-Torque Air Servo

Tower Stock# LXMHB6  •  Manufacturer Stock# S9155
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Notes from our tech department:
This is the Futaba S9155 Digital High Torque Metal Gear Servo.
with J Connector.
Designed for aircraft applications
This servo requires high-current draw from batteries.


Coreless motor, see COMMENTS
Digitally enhanced microprocessors cut in half the response time
from transmitter input to servo reaction
Center of case is metal
Metal gears
One year warranty


One S9155 Digital High Torque Servo with J Connector
Round servo wheel 1.8" (45mm) diameter
Four point servo wheel 1.5" (38.5mm) diameter
Six point servo wheel 1.2" (32mm) diameter
Four rubber grommets
Four metal eyelets
Four 2x11mm mounting screws
3x8mm horn set screw


Speed: 0.16 sec/60 @ 4.8V
0.13.8 sec/60 @ 6.0V
Torque: 153 oz-in @ 4.8V (11.0kg/cm)
192 oz-in @ 6.0V (13.8kg/cm)
Dimensions: 1.6 x 0.8 x 1.4" (40 x 20 x 37mm)
Weight: 2.2oz (61g)
Power Supply: 4.8V or 6V


S9155 Digital Servo Precautions,
-It is best to avoid long leads and Y-harnesses especially with
standard grade wires. If problems are encountered, consider using
heavy duty wire such as Futaba's Heavy Duty Series or Hobbico's
Pro Series, minimizing lead lengths, and/or removing Y-harnesses.
-Current Drain: This digital servo is specially designed for high-
torque or high-speed, therefore very high current drain is normal
at startup. For ultimate performance when using this servo please
review the following points.
1. Radio systems with the Battery Fail Safe function have a
higher cut-off voltage setting which will cause shorter
operation time.
2. When installing the servo, please check pushrod linkage to
make sure there is no binding in order to prevent excessive
power consumption and decrease the life of the motor and

A note on Coreless motors: conventional servo motors have a steel
core armature wrapped with wire that spins inside the magnets. In
a Coreless design, the armature uses a thin wire mesh that forms a
cup that spins around the outside of the magnet eliminating the
heavy steel core. This design results in smoother operation and
faster response time.

This digital servo cannot be used with any AM transmitters including
the following Futaba models as the servo neutral signal is: 1310us.
CONQUEST AM, FG Series (T4FG, T5FGK,T6FG, T6FGK, T7FGK), New Terra-
top, T3EGX, T3PGE, T2NL, T2LGX, T2FR, T2PK series.

jxs 6/23/06
updated jpg 3/27/07


Manufacturer Contact Information

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