The EMAX ES9054II combines contactless magnetic-encoder feedback, an all-metal case and gear train, and 6.0–8.4V operation for fast, repeatable control in RC helicopters, fixed-wing aircraft and robotic mechanisms.
Maximum torque25 kgf·cmAt 8.4V
Maximum speed0.09 secPer 60° at 8.4V
FeedbackMagneticContactless encoder
HV range6.0–8.4V2S-capable system range
01 / Performance by voltage
Know exactly what the servo delivers.
Torque and transit speed are paired at each rated voltage so you can match the ES9054II to your power system without guessing.
Power-system check: Size the receiver, BEC, wiring and battery path for the servo's approximately 4.0–5.5A stall-current reference range.
6.0VStandard HV entry
Stall torque18 kgf·cm
Transit speed0.12 sec/60°
7.4V2S nominal
Stall torque22 kgf·cm
Transit speed0.10 sec/60°
8.4VFull rated output
Stall torque25 kgf·cm
Transit speed0.09 sec/60°
02 / Magnetic encoder feedback
Precision without a contact-wear feedback track.
Instead of relying on a conventional contact potentiometer for position sensing, the ES9054II uses a non-contact magnetic encoder. It is designed to maintain consistent centering through vibration and long operating cycles while reducing wear-related position changes.
01
Repeatable centering
Precise position feedback supports consistent return-to-center behavior for demanding control loops.
02
Vibration-ready sensing
Contactless feedback is well suited to helicopter and aircraft environments with persistent vibration.
03
Long-cycle confidence
No sliding feedback contact means one less wear surface in repeated-motion applications.
03 / Application fit
One standard-size servo. Multiple precision-control roles.
RC helicopter tailFast correction speed and stable centering for tail-control applications.
Fixed-wing aircraftStrong holding torque for larger primary control surfaces.
Robotic joints180° or full-range 360° positional control for articulated mechanisms.
Custom automationStandard PWM input and all-metal construction for repeated motion.
04 / Specifications and fitment
Check the electrical and mechanical interface before ordering.
Servo type
Magnetic encoder / brushed / digital / all-metal
Operating voltage
6.0–8.4V
Speed at 6.0 / 7.4 / 8.4V
0.12 / 0.10 / 0.09 sec/60°
Stall torque at 6.0 / 7.4 / 8.4V
18 / 22 / 25 kgf·cm
Stall current
Approx. 4.0–5.5A typical reference range
Rotation
180° ±2°; supports 360° full-range positional control
PWM range
500–2500μs
Connector
JR
Output spline
23T
Dimensions
Approx. 40 × 20 × 38.5 mm
Net weight
72 ±1g
Confirm 23T horn compatibility
Confirm the servo bay accepts a 40 × 20 mm standard footprint
Confirm receiver/BEC voltage does not exceed 8.4V
Confirm the power path can support servo peak current
Center electronically before installing the horn
Set travel endpoints to avoid mechanical binding
Important: “360° positional control” is not the same as uncontrolled continuous rotation. The controller must support the required pulse range and position mode.
05 / Compatibility FAQ
Answers before installation.
Will it work with a standard PWM receiver?
Yes. The ES9054II uses a JR connector and standard 500–2500μs PWM control. Confirm the receiver or controller supports the travel range required by your setup.
Can I run it from a 2S LiPo system?
The 6.0–8.4V rating covers the nominal and fully charged voltage of a 2S LiPo system. The receiver, BEC, wiring and every connected device must also be rated for the selected voltage and current demand.
What is the practical benefit of the magnetic encoder?
The contactless position sensor avoids the sliding feedback contact used in a conventional potentiometer. That supports consistent centering under vibration and repeated motion while reducing one source of wear-related drift.
Is the ES9054II brushless?
No. The verified product specification identifies a brushed motor with digital control, a magnetic encoder, metal gears and an all-metal housing.
What is included?
One ES9054II servo, a servo-horn and mounting-hardware kit, and a user instruction manual.
