RDNA0403

Overview

The Radient RS-SD201-MG is a standard-size digital high-voltage servo that brings impressive performance and proven reliability to a wide range of RC applications. Whether you're building an RC car, truck, boat, aircraft, helicopter or drone, this metal-geared servo delivers the combination of speed, torque and durability that serious RC enthusiasts demand. Radient servos are rapidly building a reputation for reliability that complements their outstanding value, and the RS-SD201-MG is a perfect example of this commitment to quality. With its robust construction, dual ball-raced output shaft and metal gears, this servo is engineered to handle demanding RC tasks across cars, buggies, crawlers, scale models and many other applications.

This high-voltage capable servo is ideal for RC hobbyists who want dependable performance without compromise. The digital control system ensures precise and consistent centring, while the water-resistant design with O-ring seals provides protection against moisture and dust. If you're looking for a reliable servo for your RC car UK build, RC aircraft project, or any other hobby application, the RS-SD201-MG offers excellent value and performance. The servo features a 3P iron core motor for smooth operation and comes with everything you need to get started, including mounting hardware and servo horns.

At just 56 grams, this compact standard-size servo is light enough for speed-focused applications yet tough enough for rock crawlers and scale rigs. The 25-tooth spline output shaft is a popular standard that works with a vast range of servo horns and linkages available from RC retailers across the UK and beyond. Whether you're a seasoned competitor, weekend basher, or just discovering the world of RC, the RS-SD201-MG delivers the size, power, torque and speed to suit your application.

Key Features

• Digital Control System — Digital servo technology provides precise and consistent centring, ensuring accurate control inputs and repeatable performance across all your RC manoeuvres and adjustments.
• Metal Gears — Durable metal gear construction delivers superior strength and longevity compared to plastic alternatives, making this servo suitable for high-stress applications and demanding RC driving conditions.
• Dual Ball-Raced Output Shaft — The output shaft rides on dual ball bearings, reducing friction and wear whilst enabling smooth, responsive servo movement that improves overall handling and control feel.
• High-Voltage Capable (6.0–7.4V) — This servo can operate across both 6.0V and 7.4V power sources, giving you flexibility in battery selection and allowing increased performance when running higher-voltage LiPo packs.
• Water-Resistant Design with O-Ring Seals — O-ring seals provide robust protection against moisture, dust and debris, making this servo suitable for wet conditions, water-based RC applications and outdoor use in variable weather.
• 3P Iron Core Motor — The high-quality iron core motor design delivers smooth, efficient operation with minimal noise, providing consistent power delivery and responsive servo performance.
• 25-Tooth Spline Output — The standard 25-tooth spline is compatible with a huge selection of servo horns and linkage components widely available from UK RC retailers, offering maximum customisation flexibility.
• Lightweight Construction — Weighing just 56 grams, this servo is light enough for speed-focused RC cars and aircraft whilst maintaining robust durability and strength for demanding applications.
• Standard Servo Size — The compact standard form factor (40.8 x 20.1 x 38.0 mm) fits seamlessly into most RC car servo bays, helicopter control frames and aircraft fuselages without modification.

Technical Performance

The Radient RS-SD201-MG delivers impressive performance across the board, with speed and torque figures that stack up well against competitors in its class. At 6.0V, the servo achieves 0.12 seconds per 60 degrees of movement with 9.0 kg.cm of torque, whilst at 7.4V operation the servo accelerates to 0.10 seconds per 60 degrees with an impressive 10 kg.cm of torque output. This makes the RS-SD201-MG capable of handling 10kg servo applications, making it suitable for larger control surfaces on scale aircraft, multi-rotor drones, helicopters and RC boats, as well as powerful steering and throttle control duties on RC cars and trucks. The 3P iron core motor operates smoothly and efficiently, whilst the full metal gear drivetrain ensures durability under continuous operation. The dual ball-raced output shaft reduces friction and wear, allowing the servo to maintain its performance characteristics over extended use. The water-resistant case with O-ring seals protects the internal electronics and mechanisms, making this servo suitable for muddy off-road basher applications, water-based RC boating, and general outdoor RC use where dust and moisture exposure is inevitable. Whether you're running this servo in an RC car, truck, boat, aircraft, helicopter or drone, the combination of speed, torque, metal construction and sealed design makes it a reliable choice for serious hobbyists.

What's in the Box

• Radient RS-SD201-MG Digital High-Voltage Servo
• Mounting Hardware (brackets and screws)
• Multiple Servo Horns (standard spline-compatible designs)

Frequently Asked Questions

• What voltage should I run this servo at? — The RS-SD201-MG is designed to operate at either 6.0V or 7.4V, offering you flexibility in power source selection. Running at 7.4V will provide faster response times (0.10 seconds per 60 degrees versus 0.12 seconds) and increased torque output (10 kg.cm versus 9.0 kg.cm), which is beneficial for demanding applications or where maximum performance is required.
• Is the RS-SD201-MG waterproof? — The servo features a water-resistant design with O-ring seals and a sealed case, making it suitable for wet conditions and moisture exposure. Whilst not fully waterproof, the sealing measures provide reliable protection for muddy RC cars, water-based boats and outdoor use in variable weather conditions.
• What battery does this servo need? — This servo operates from standard 2S LiPo batteries (7.4V nominal) or lower-voltage 1S packs and 6.0V battery packs. Most RC enthusiasts pair this servo with 2S LiPo systems commonly used in modern RC cars and trucks, though compatibility depends on your specific RC vehicle's electrical system.
• What applications is the RS-SD201-MG suitable for? — This standard-size servo is incredibly versatile and works excellently in RC cars, trucks, buggies, crawlers, boats, aircraft, helicopters and drones. The 10kg torque rating and fast response time make it ideal for steering control in on-road and off-road RC cars, throttle control in boats, and control surfaces on aircraft and helicopters.
• How does this servo compare to other standard servos? — The RS-SD201-MG stands out with its combination of metal gears, digital control, dual ball-raced output shaft and water-resistant sealing. At its price point, it offers excellent value, delivering features typically found on more expensive servos whilst maintaining Radient's reputation for reliability and quality construction.
• Is this servo suitable for beginners? — Yes, absolutely. The RS-SD201-MG is straightforward to install in most RC applications and requires no special calibration or programming. Its durable metal gears and sealed design make it forgiving of typical beginner mistakes, whilst the responsive performance will help newer hobbyists develop their driving skills confidently.
• What is the servo spline type? — The RS-SD201-MG features a standard 25-tooth spline output, which is compatible with the vast majority of servo horns and linkage components available from UK RC retailers, ensuring you'll have no difficulty finding replacement parts or upgrade options.

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 Radient RS-SD201-MG Standard Digital HV MG Servo 10kg 0.1s 6.0 - 7.4V RDNA0403 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.