ET0018-2

Overview

The Etronix ES090 is a reliable, standard-sized waterproof servo designed for use in RC cars, boats, and aircraft. Whether you're a seasoned RC enthusiast running a competitive RC car UK setup or a hobbyist exploring RC models, this servo delivers the performance and durability you need. Now upgraded to handle 7.4V and fully HV capable, it combines robust metal gears with a practical balance of speed and torque, making it an excellent choice for demanding RC applications across a wide range of platforms.

Built with precision engineering, the Etronix ES090 ensures smooth, precise control every time you use it. This standard-size servo fits seamlessly into most RC car, boat, and aircraft setups, offering the familiar 25T spline format that works with countless ready to run RC models and custom builds. The waterproof design means you can confidently use this servo in wet conditions, from RC boat racing to off-road adventures where moisture exposure is a concern. At just £17.09, it represents excellent value for money and a reliable upgrade option for RC enthusiasts looking to improve their model's performance.

RC Model Shop stocks the Etronix ES090 because we recognise that quality servos are the backbone of responsive RC performance. Whether you need this servo for steering control, throttle management, or camera pan functionality, its proven reliability makes it a go-to choice for RC hobbyists throughout the UK and beyond.

Key Features

• Metal Gears — Constructed with durable metal gears rather than plastic, this servo resists wear and delivers consistent performance over thousands of cycles, making it far more reliable for heavy-use RC applications than budget alternatives with plastic gears.
• High Torque Output — Delivering 9kg-cm of torque at 7.4V, the ES090 provides more than enough pulling power to control larger RC car servos, boat rudders, and aircraft control surfaces with confidence and precision.
• Rapid Response Speed — With a 0.13-second transit time at 7.4V, this servo responds quickly to your radio commands, translating to snappier steering and more responsive control on the track or water.
• Fully Waterproof Design — The complete waterproof sealing means you can use this servo in RC boats, amphibious RC vehicles, and outdoor RC cars exposed to rain or spray without fear of water damage or electronics failure.
• 7.4V HV Capable — Unlike older servo technology, the ES090 is fully HV (high voltage) capable and runs smoothly at 7.4V, delivering improved performance compared to standard 6.0V operation whilst remaining backward compatible.
• Standard Size Format — The compact 40.7 x 20.4 x 37mm dimensions fit standard servo bays in most RC cars, boats, and aircraft, making installation straightforward and compatible with the vast majority of RC platforms.
• 25T Spline Mount — The universal 25T spline ensures compatibility with standard servo horns and linkages used across the RC hobby, allowing easy integration into existing setups or new builds.
• Plastic and Aluminium Case — The combination of lightweight plastic and reinforced aluminium components provides excellent balance between weight savings and structural durability, important for maintaining speed and precision in RC models.

Technical Performance

The Etronix ES090 represents a well-engineered servo solution for intermediate and experienced RC enthusiasts. Built around durable metal gears, this servo delivers 9kg-cm of torque at 7.4V, with an impressive 0.13-second response time over a 60-degree arc—fast enough for competitive RC car racing, responsive enough for precise boat steering, and strong enough for aircraft control surfaces. The servo accepts power from 6.0V NiMh batteries (delivering 7kg-cm torque and 0.15-second speed) right through to 7.4V LiPo or LiFe packs (9kg-cm torque and 0.13-second speed), making it a versatile choice for different RC setups and power systems. The waterproof rating is complete—not just splash-resistant—meaning you can confidently deploy this servo in RC boats, amphibious vehicles, and outdoor RC cars where water exposure is inevitable. The plastic and aluminium case strikes an excellent balance: plastic keeps weight minimal whilst aluminium reinforcement protects the mechanism where it matters most. The 25T spline is the industry standard for this servo size, ensuring you'll have no shortage of compatible horns, linkages, and mounting hardware available. At 40.7 x 20.4 x 37mm, it's truly standard-sized, fitting neatly into servo bays designed for conventional servos, making upgrades and replacements straightforward. The combination of metal gears, HV capability, and waterproof construction makes this servo tougher than many budget alternatives whilst remaining affordable—ideal for RC enthusiasts who want reliability without premium pricing.

What's in the Box

• Etronix ES090 9kg-cm 0.13s Standard Size Waterproof Servo
• Standard servo horns (included with servo)

What You Need to Complete

• RC receiver compatible with your radio transmitter system
• Servo control lead connection to your receiver
• Power supply (6.0V NiMh or 7.4V LiPo/LiFe battery)
• RC model equipped with a standard servo bay (car, boat, or aircraft)

Frequently Asked Questions

• Is the Etronix ES090 suitable for RC boat applications? — Yes, absolutely. The complete waterproof design makes this servo ideal for RC boat steering and throttle control. Whether you're running a small RC speedboat or a larger scale RC cruiser, the 9kg-cm torque provides excellent holding power against water resistance and rudder drag, whilst the waterproof sealing means water intrusion is not a concern even if you capsize or experience heavy spray.
• What voltage should I run the Etronix ES090 at? — This servo operates across a voltage range from 6.0V NiMh (where it delivers 0.15-second speed and 7kg-cm torque) through to 7.4V LiPo or LiFe (where it delivers 0.13-second speed and 9kg-cm torque). Most modern RC cars and boats run 7.4V, so you'll get the best performance and fastest response from a 2-cell LiPo pack. The servo is fully HV capable, meaning it's designed to handle the slightly higher voltage without degradation.
• How does the Etronix ES090 compare to plastic-gear servos? — The key difference is durability. This servo uses metal gears throughout, which resist wear and maintain precision over thousands of operating hours. Plastic-gear servos are cheaper upfront but wear faster and lose accuracy sooner, requiring replacement more frequently. If you're a regular RC user, the metal gears in the ES090 represent better long-term value.
• Can I use this servo in an RC car? — Yes, the ES090 works perfectly for RC car steering control. The 0.13-second response time delivers snappy steering feel, whilst the 9kg-cm torque easily handles the mechanical advantage of most RC car steering linkages. It's equally at home in entry-level bashers and competitive track cars.
• Is this servo good for beginners? — The Etronix ES090 is suitable for both beginners and experienced users. It's standard-sized, easily installed, and doesn't require special wiring or configuration beyond basic RC receiver connection. However, it's worth noting that this is a servo only—you'll need to provide your own receiver, radio system, and RC model platform. If you're entirely new to RC, a ready to run RC car or boat kit might be a better starting point.
• What makes the 25T spline important? — The 25T spline is the industry-standard horn mount for this servo size, meaning you'll have endless options for servo horns, linkages, and control arms from multiple manufacturers. This universal compatibility makes customisation, repair, and upgrades straightforward—you won't be locked into proprietary components.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ETRONIX ES090 9KG/0.13s STD SIZE WATERPROOF MG SERVO ET0018-2 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.