Overview
The Futaba S-A501 Standard Coreless Servo is a high-performance digital servo engineered for precision RC aeroplane applications, particularly those in the 30cc aircraft class. This advanced servo represents the pinnacle of Futaba's servo technology, combining coreless motor innovation with robust metal gearing to deliver exceptional speed, torque and reliability. Whether you're flying fixed-wing aircraft, exploring competitive aerobatic flying, or building an advanced RC model, the S-A501 provides the control authority and responsiveness you need for demanding flight operations.
As a recognised standard-size servo compatible with both PWM and S.BUS2 control protocols, the Futaba S-A501 integrates seamlessly into modern RC systems. The servo's compact dimensions of 40×20×36.8mm mean it fits easily into standard servo bays found in 30cc aircraft, whilst its lightweight 61-gram construction ensures minimal added mass to your airframe. This is particularly important for RC aeroplane enthusiasts in the UK and across Europe who understand that servo weight directly impacts aircraft performance, handling characteristics and battery consumption.
The S-A501 is built to exacting Japanese manufacturing standards by Futaba, a company with over 60 years of heritage in radio control technology. Every component, from the dual ball bearing gear support to the metal multi-stage gearing, reflects Futaba's commitment to precision engineering. RC model shop customers can be confident they're investing in a servo backed by Futaba's reputation for excellence and proven longevity in demanding RC applications.
Key Features
- S.BUS2 and PWM Control Compatibility — This dual-protocol support allows the servo to work with a wide range of modern Futaba radio systems and compatible third-party equipment, future-proofing your investment and providing flexibility in system configuration as your RC interests evolve.
- Coreless Digital Motor — The coreless motor design eliminates iron losses and reduces inertia, resulting in faster response times and smoother control compared to traditional coreless motors, which translates directly to more precise aircraft control during flight.
- Exceptional Speed: 0.11 seconds per 60 degrees at 7.4V — This rapid response time ensures your control inputs are executed immediately, critical for aerobatic flying, combat manoeuvres and maintaining stable flight in challenging wind conditions typical of UK flying locations.
- Powerful Torque Output: 16.8 kgf·cm at 7.4V — The high torque rating delivers strong control authority for primary flight surfaces including elevators, rudders and ailerons, maintaining authority even when deflecting control surfaces at speed or against aerodynamic loads.
- Metal Gears with Dual Ball Bearing Support — The servo features metal 2-3 stage gearing in the main stages with an aluminium final stage gear, all supported by dual ball bearings for smooth operation, reduced backlash and extended service life even in intensive flying schedules.
- Aluminium Middle Case Construction — The sturdy aluminium middle case provides structural rigidity and excellent heat dissipation, protecting internal components whilst keeping the servo lightweight and resistant to the vibration and stresses inherent in aircraft servo duty.
- 25T Metal Spline (Ø6mm) — The standard metal spline accepts standard Futaba servo horns and arms, ensuring compatibility with existing servo hardware and allowing easy customisation of control throw geometry to match your specific aircraft requirements.
- Rated Voltage Range 6.0V to 7.4V — The servo accepts input from standard 2-cell LiPo batteries (7.4V fully charged) down to 6.0V nominal, with performance scaling appropriately across the voltage range, allowing operation from partially discharged batteries without performance loss.
- Standard Size Form Factor — At just 40×20×36.8mm, the S-A501 fits standard servo installation spaces found in most 30cc aircraft and many smaller models, simplifying installation and allowing straightforward integration into fuselage, wing and empennage mounting locations.
- Complete Servo Package — Arrives with multiple servo horns and mounting hardware included, allowing immediate installation without purchasing additional accessories, saving time and cost for RC aeroplane enthusiasts ready to put the servo into service.
Technical Performance
The Futaba S-A501 Standard Coreless Servo represents a sophisticated piece of precision engineering optimised for RC aeroplane flight control applications. The coreless digital motor design eliminates the iron core found in traditional servo motors, reducing rotational inertia and electrical losses whilst maintaining impressive power output across the servo's rated voltage range. At maximum voltage (7.4V), the servo delivers 16.8 kgf·cm of torque with a response speed of 0.11 seconds per 60 degrees, figures that place it at the high end of performance for standard-size servos. At 6.6V nominal voltage from a fully charged 2-cell LiPo pack, torque remains respectable at 15.0 kgf·cm with speed of 0.12 seconds per 60 degrees, ensuring reliable performance throughout the battery discharge cycle. The multi-stage metal gear train consists of 2-3 stages of metal gears with an aluminium final stage gear, supported throughout by dual ball bearings that eliminate side-play whilst distributing radial loads evenly across the gear train. This bearing arrangement is essential in servo duty where rapid direction reversals and sustained load applications are commonplace during aerobatic flying and precision manoeuvres.
The servo case features an aluminium middle section sandwiched between plastic end caps, providing an excellent balance between weight (just 61 grams complete) and structural rigidity. The aluminium middle case also aids heat dissipation, important for servos experiencing sustained load during longer flights or continuous corrective inputs in windy conditions. The servo accepts digital input via both PWM (pulse width modulation) and S.BUS2 protocols, allowing integration with Futaba's latest generation control systems whilst maintaining backward compatibility with older PWM-based radio systems. The 25T metal spline shaft (6mm diameter) mates with standard Futaba servo horns and arms widely available in the UK RC market, ensuring you have diverse options for control surface rigging geometry and throw adjustment. The servo's rated operating voltage range of 4.8V to 7.4V encompasses everything from fully charged 2-cell LiPo batteries through various discharge states and down to partially depleted battery voltages, providing operational flexibility without performance cliffs that might degrade flight characteristics unexpectedly.
What's in the Box
- 1x Futaba S-A501 Standard Coreless Servo
- Multiple servo horns for varied control surface applications
- Mounting hardware including screws and fasteners for secure installation
Frequently Asked Questions
- Is the Futaba S-A501 suitable for beginner RC aeroplane pilots? — Whilst the S-A501 is an excellent servo, it represents a premium specification more commonly found in intermediate to advanced RC aircraft applications rather than entry-level trainers. Beginners starting with basic trainer aircraft might find more cost-effective servo options suitable for their needs, but experienced pilots looking for the best performance will find the S-A501 indispensable.
- What battery does this servo need and how does voltage affect performance? — The S-A501 operates across the range 4.8V to 7.4V, meaning it runs from standard 2-cell LiPo batteries which charge to 7.4V nominal. A fully charged 2-cell LiPo delivers maximum performance (16.8 kgf·cm torque, 0.11 seconds per 60 degrees), whilst at 6.0V the servo still produces 13.8 kgf·cm torque at 0.13 seconds per 60 degrees. Most RC pilots use 2-cell LiPo batteries sized appropriately for their airframe, with the S-A501 drawing power-proportional current during operation rather than continuous high current like electric motors do.
- How does the S-A501 compare to other standard-size servos? — The S-A501 distinguishes itself through several factors: coreless motor technology for faster response, dual ball bearing gear support for precision and longevity, metal gears throughout the drive train for durability, and dual-protocol support (PWM and S.BUS2) for modern radio integration. The 0.11-second response time at 7.4V places it among the fastest standard-size servos available, important for aerobatic flying and responsive control. The 16.8 kgf·cm torque rating ensures adequate control authority even on larger control surfaces or in high-speed flight conditions.
- What does S.BUS2 control mean and do I need it? — S.BUS2 is Futaba's advanced digital servo control protocol allowing bidirectional communication between radio transmitter and servo, enabling telemetry feedback about servo position, voltage and current draw to be transmitted back to the pilot. This capability appears on advanced Futaba radio systems but the servo also supports traditional PWM protocol, so it works with any compatible radio system regardless of whether you use the advanced telemetry features.
- Is the S-A501 waterproof for flying in rainy conditions? — Whilst the servo's metal gearing and bearings are robust, Futaba does not specify waterproof or weather-sealed ratings for the S-A501. In rainy UK flying conditions, protecting the servo from direct water exposure through careful aircraft design and weatherproofing the fuselage is recommended, though brief exposure to moisture during typical RC operations should not cause problems.
- How much does the servo weigh and why does that matter? — The S-A501 weighs just 61 grams, making it one of the lightest high-performance standard-size servos available. In RC aeroplane applications, servo weight directly affects aircraft balance, centre of gravity position, and overall weight budget. Lighter servos allow either larger fuel tanks, larger batteries or better performance-to-weight ratios critical for aerobatic and competitive flying.
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 Futaba S-A501 Standard Coreless Servo PWM/S.BUS2 16.8kg 0.11s 4.8V - 7.4V FUT05102719-3 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.
- Brand: Futaba
- Model: S-A501
- Model Number: FUT05102719-3
- Product Type: Standard Size Digital Coreless Servo
- Colour: Black
- Control Protocols: PWM, S.BUS, S.BUS2
- Motor Type: Coreless Digital
- Dimensions: 40×20×36.8mm
- Length: 40mm
- Width: 20mm
- Height: 36.8mm
- Weight: 61g
- Shipping Weight: 0.12kg
- Max Torque at 7.4V: 16.8 kgf·cm (233.4 oz/in)
- Max Torque at 6.6V: 15.0 kgf·cm
- Max Torque at 6.0V: 13.8 kgf·cm (191.7 oz/in)
- Max Speed at 7.4V: 0.11 seconds per 60 degrees
- Max Speed at 6.6V: 0.12 seconds per 60 degrees
- Max Speed at 6.0V: 0.13 seconds per 60 degrees
- Voltage Range: 4.8V - 7.4V
- Rated Voltage: 6.0V - 7.4V
- Gears: Metal 2-3 stage gearing with aluminium final stage gear
- Spline: 25T Metal Spline (Ø6mm)
- Bearings: Dual Ball Bearing support
- Case: Aluminium middle case with plastic end caps
- Circuit: Digital
- Included Components: 1x S-A501 Standard Coreless Servo, servo horns, mounting hardware
- Suggested Application: RC aeroplane applications, 30cc aircraft class
- Age Recommendation: 14+
Product Description of Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2
The Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2 is a precision-engineered standard-size servo designed for 30cc class aircraft requiring high torque and responsive control. Built around a digital coreless motor architecture, this black servo delivers a torque output of 16.8kgf.cm at 7.4V and a speed of 0.11 seconds per 60°, making it ideal for throttle, elevator, and rudder applications in mid-size planes. With support for both PWM and S.Bus2 protocols, the Futaba FUT05102719-3 standard digital servo 16.8kg 0.11s offers flexible integration with conventional receivers and advanced telemetry systems, ensuring reliable performance across a wide range of setups.
Key features of the Futaba FUT05102719-3 S-A501 coreless servo
- Digital coreless motor – delivers smooth, precise movement with reduced power draw
- Standard-size footprint – compatible with most 30cc aircraft servo bays
- High torque output – 16.8kgf.cm at 7.4V for confident control authority
- Fast response – 0.11 sec/60° at 7.4V for accurate actuation under load
- Metal gear train – ensures long-term durability in vibration-heavy environments
- Dual ball bearings – enhances mechanical efficiency and reduces wear
- 25T spline – compatible with Futaba-standard servo horns and linkages
- Plastic case – lightweight housing designed for general-purpose airframe integration
Why is the Futaba FUT05102719-3 PWM servo for 30cc aircraft ideal for mid-size planes?
The Futaba FUT05102719-3 PWM servo for 30cc aircraft is tailored for pilots operating mid-size planes that demand reliable torque and responsive control. With a torque rating of 16.8kgf.cm and a speed of 0.11 seconds per 60° at 7.4V, this servo provides the strength and agility needed for precise throttle, elevator, and rudder movements. Its standard dimensions (40.0 × 20.0 × 36.8 mm) allow for seamless installation into common servo bays, while the PWM signal compatibility ensures broad receiver support. Whether you're flying aerobatics or scale models, this servo delivers dependable performance where it counts.
How does the Futaba FUT05102719-3 with metal gears and dual bearings improve durability?
Durability is essential in aircraft servos, and the Futaba FUT05102719-3 with metal gears and dual bearings is built to withstand the rigors of flight. The metal gear train resists wear and maintains torque transmission under load, while dual ball bearings reduce friction and extend operational life. These features ensure consistent performance even in vibration-prone environments, making the servo a reliable choice for long-term use in 30cc class aircraft. Combined with its coreless motor design, the servo offers smooth motion and mechanical resilience throughout the flight envelope.
What benefits does the Futaba S-A501 servo with 25T spline and plastic case offer for installation?
Installation is simplified with the Futaba S-A501 servo with 25T spline and plastic case. The 25T spline output shaft ensures compatibility with Futaba-standard servo horns, allowing users to integrate the servo into existing control linkages without modification. The plastic case provides a lightweight housing that reduces overall airframe weight while maintaining structural integrity. This combination of universal spline design and lightweight construction makes the S-A501 a practical choice for hobbyists and professionals seeking efficient setup and reliable performance.
Is the Futaba standard servo for 7.4V setups and S.Bus2 systems suitable for telemetry integration?
The Futaba standard servo for 7.4V setups and S.Bus2 systems is designed to support both conventional and advanced control architectures. Its compatibility with S.Bus2 enables streamlined wiring and centralized configuration, while the 7.4V rating ensures optimal torque and speed for demanding flight conditions. This dual-protocol flexibility allows users to integrate the servo into telemetry-enabled systems, providing real-time feedback and enhanced control precision. Whether you're upgrading an existing aircraft or building a new one, this servo offers the adaptability needed for modern RC setups.
How does the Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2 enhance control fidelity?
Control fidelity is critical in RC aviation, and the Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2 delivers smooth, accurate motion across all control surfaces. The coreless motor architecture reduces cogging and improves responsiveness, while digital signal processing ensures consistent output under varying loads. With S.Bus2 support, users can configure servo parameters and monitor performance through compatible transmitters, enhancing situational awareness and flight stability. These features make the S-A501 a trusted component for pilots who prioritize precision and reliability in their aircraft builds.
For RC pilots seeking a high-torque, fast-response servo with advanced signal support and installation-ready convenience, the affordable Futaba S-A501 with 0.11s speed and 16.8kg torque is a top-tier choice. Buy Futaba FUT05102719-3 servo with horns and mounting hardware today.
Technical Specifications of Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2
Brand, Model and Product Type
- Brand: Futaba
- Model: FUT05102719-3
- Product Type: Futaba FUT05102719-3 S-A501 coreless servo with S.Bus2, Futaba FUT05102719-3 standard digital servo 16.8kg 0.11s, Futaba FUT05102719-3 PWM servo for 30cc aircraft, Futaba FUT05102719-3 with metal gears and dual bearings, Futaba S-A501 servo with 25T spline and plastic case
- Product Color: Black
Dimensions
- Product Length: 4.0 cm – standard fit for 30cc aircraft servo bays
- Product Width: 2.0 cm – compact enough for multi-servo installations
- Product Height: 3.7 cm – suitable for fuselage and wing-mounted control surfaces
- Product Weight: 61 g – balanced for mid-size aircraft without adding excess load
- Shipping Weight: 0.12 kg – includes packaging and accessories
Performance Specifications
- Torque at 7.4V: 16.8 kgf.cm – delivers strong control authority for throttle, rudder, and elevator
- Torque at 6.6V: 15.0 kgf.cm – maintains reliable output under moderate voltage
- Torque at 6.0V: 13.8 kgf.cm – suitable for legacy setups with lower voltage
- Speed at 7.4V: 0.11 sec/60° – fast actuation for responsive control inputs
- Speed at 6.6V: 0.12 sec/60° – consistent performance across voltage range
- Speed at 6.0V: 0.13 sec/60° – smooth operation for general-purpose flight
Motor and Signal Control
- Motor Type: Coreless – provides efficient, low-friction movement with reduced cogging
- Signal Compatibility: PWM and S.Bus2 – supports both conventional and digital control systems
Construction and Materials
- Gear Type: Metal – built for durability under high-load conditions
- Bearings: Dual ball bearings – enhances mechanical efficiency and longevity
- Spline Count: 25T – compatible with Futaba-standard servo horns
- Case Material: Plastic – lightweight housing for general-purpose airframe integration
Voltage and Power Requirements
- Rated Voltage: DC 6.0V – 7.4V – optimized for mid-voltage aircraft systems
- Operating Voltage: DC 4.8V – 7.4V – supports a broad range of power sources
- Battery Compatibility: Dry batteries not supported – use regulated power systems only
Application and Use Case
- Servo Type: Standard – ideal for 30cc class aircraft and general-purpose control surfaces
- Use Case: Throttle, elevator, rudder, and flap control – engineered for mid-size aircraft
- Recommended Aircraft: 30cc class planes requiring high torque and fast response
What’s in the Box
- 1 × Futaba S-A501 Standard Coreless Servo
- Servo horns
- Mounting hardware
What You Require
- Compatible Futaba transmitter with S.Bus2 support
- Power source within 4.8V to 7.4V range
Sold Separately
- Futaba transmitter with programmable servo settings
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