Product overview
The EMAX ES9254 II is a digital servo intended specifically for RC helicopter control, including tail control and high-speed flight applications. Its architecture combines a coreless brushed motor, metal gears, an all-metal housing and contactless magnetic encoder feedback. The encoder supports up to 360° effective control with angle error below 2°. A dedicated RC control chip responds about twice as fast as conventional chips, supporting the servo’s role in responsive helicopter control. The output uses a 25T spline.
Installation planning centers on a 40 × 20 × 38.5mm body, a net weight of 72 ±1g and a JR connector on a 300 ±8mm, 3-pin lead. The operating supply range is 6.0–8.4V, with speed, torque and current varying by voltage. At 8.4V, operating speed is 0.035 sec/60°, maximum stall torque is 7.5 kgf·cm and maximum current is 5.0A. Operating temperature is limited to -20°C to 60°C; storage temperature spans -30°C to 70°C. IP67 protection supports outdoor helicopter use.
The supplied configuration comprises one ES9254 II servo unit, servo horns, a mounting hardware kit and a user instruction manual. Procurement therefore concerns an individual helicopter control component. Its integration interfaces are the 25T output spline and JR electrical connector, alongside the specified body dimensions and lead length. For supply sizing, maximum current ranges from 3.5A at 6.0V to 5.0A at 8.4V, while no-load running current reaches 1800mA maximum at 8.4V. Idle current is specified separately at 11.5mA.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | EMAX ES9254 II |
| Product type | Magnetic encoder, coreless brushed, digital, all-metal helicopter servo |
| Operating voltage | 6.0–8.4V |
| Operating speed | 0.05 / 0.04 / 0.035 sec/60°At 6.0 / 7.4 / 8.4V, respectively. |
| Running current | 1200 / 1500 / 1800mA maxNo load; at 6.0 / 7.4 / 8.4V, respectively. |
| Stall torque | 5.0 / 6.5 / 7.5 kgf·cm maxAt 6.0 / 7.4 / 8.4V, respectively. |
| Maximum current | 3.5 / 4.3 / 5.0A maxAt 6.0 / 7.4 / 8.4V, respectively. |
| Idle current | 11.5mA |
| Storage temperature | -30°C to 70°C |
| Operating temperature | -20°C to 60°C |
| Net weight | 72 ±1g |
| Dimensions | 40 × 20 × 38.5mm |
| Connector | JR |
| Lead length | 300 ±8mm3-pin lead. |
| Output spline | 25T |
| Bearings | 2BB |
| Gear material | Metal |
| Control range and angle error | Up to 360° effective control; angle error less than 2° |
| Protection | IP67 |
| SKU | 0102007011 |
| Position feedback | Contactless magnetic encoder |
| Control chip response | Dedicated RC control chip responds about twice as fastCompared with conventional chips. |
| Housing | All-metal housing |
| Recommended applications | RC helicopter tail control, high-speed helicopter flight control, precision 25T servo installations and outdoor RC helicopter operation |
| Package contents | 1 × ES9254 II servo unit; servo horns and mounting hardware kit; user instruction manualIncluded equipment. |
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