Overview
The Futaba HPS-HC701 Low Profile Brushless Servo represents the pinnacle of high-performance cyclic servo engineering, purpose-built for demanding RC helicopter pilots who require precision, speed and reliability. This advanced programmable servo is engineered specifically for 500–800 size RC helicopters utilising 3D and F3C freestyle flight disciplines, where responsive control authority and repeatability are non-negotiable. Whether you're piloting your helicopter through aggressive 3D manoeuvres or competing in F3C events, the HPS-HC701 delivers the performance characteristics that separate winning flights from ordinary ones.
Featuring Futaba's custom high-power brushless motor technology and dual ball bearing construction, this low-profile servo combines exceptional torque output with lightning-fast response times. The servo operates across a wide voltage range from 4.8V through to 7.4V, making it compatible with standard 2S LiPo batteries as well as higher-voltage setups for maximum performance. The full-aluminium case construction—upper, middle and lower sections—provides outstanding rigidity and thermal dissipation, ensuring consistent performance even during extended flight sessions. When you purchase the Futaba HPS-HC701 brushless servo for your RC helicopter UK build, you're investing in a servo that's been engineered by one of the world's leading radio control manufacturers.
What truly sets this servo apart is its versatility and programmability. The HPS-HC701 supports both PWM and S.BUS2 digital protocols, meaning it integrates seamlessly with modern Futaba receivers and radio systems. The servo features switchable pulse width modes—760µs (factory default) and 1520µs—allowing you to optimise performance characteristics for your specific flying style and aircraft setup. This flexibility, combined with the servo's compact low-profile dimensions, makes it an ideal choice for pilots building precision helicopter platforms where space is at a premium.
Key Features
- Custom High-Power Brushless Motor — The servo is equipped with Futaba's proprietary HPS brushless motor, delivering exceptional power density and reliability that outperforms conventional brushed servo motors, resulting in smoother control inputs and longer operational lifespan for your RC helicopter.
- Dual Ball Bearing Construction — Precision dual ball bearings support the servo shaft, eliminating play and ensuring smooth, consistent motion throughout the full range of travel, which is critical for maintaining cyclic control stability during 3D and F3C manoeuvres.
- Programmable HV Electronics — The servo's high-voltage electronics can be programmed and configured via PC connection using the optional CIU-2 or CIU-3 USB adapter, allowing you to fine-tune performance parameters and switch between pulse width modes to match your flying requirements.
- Switchable Pulse Width Modes (760µs/1520µs) — Factory configured to 760µs mode by default, the servo can be reprogrammed to 1520µs mode using the GPB-1 v4.3 programmer, giving you flexibility to optimise torque and speed characteristics for your specific application.
- Multi-Protocol Support (PWM/S.BUS/S.BUS2) — Full compatibility with PWM, S.BUS and S.BUS2 digital protocols means this servo works seamlessly with a wide range of modern Futaba receiver systems and radio control equipment, future-proofing your investment in RC technology.
- Full-Aluminium Case Construction — The upper, middle and lower case sections are manufactured from aluminium alloy, providing excellent rigidity to resist vibration and deformation, whilst also offering superior heat dissipation to maintain performance consistency during extended flight sessions.
- Low-Profile Design — At just 40.5 × 21.0 × 26.2mm, the HPS-HC701's compact form factor is optimised for helicopter cyclic servo bays where space is restricted, allowing for clean, streamlined builds without interference with rotor mechanics or other aircraft systems.
- Lightweight Construction — Weighing only 56 grams, this servo minimises load on your servo mounts and reduces overall helicopter weight, contributing to improved agility and energy efficiency during flight.
- Metal Gears and Spline — The servo features high-strength metal gears through three stages, with the final-stage gear made from durable metal material, paired with a metal 25-tooth spline (Ø6mm) that resists stripping and provides long-term durability even under extreme control inputs.
- Wide Voltage Operating Range — Operating voltage spans from 4.8V through 8.4V, with a rated voltage of 6.0V–7.4V, giving you flexibility to use standard 2S LiPo batteries (nominal 7.4V) or lower-voltage alternatives, whilst maintaining performance within safe operating parameters.
Technical Performance
The Futaba HPS-HC701 delivers exceptional cyclic servo performance tailored for precision RC helicopter operations. In the factory-default 760µs mode, the servo achieves a torque output of 27.0 kgf·cm at 7.4V and 24.0 kgf·cm at 6.6V, providing ample control authority for aggressive cyclic inputs characteristic of 3D and F3C flight. Speed performance remains consistent across both voltage levels at 0.07 seconds per 60-degree rotation at 7.4V and 0.08 seconds at 6.6V, ensuring rapid and repeatable response to pilot inputs. When reconfigured to the optional 1520µs mode, torque increases to 30.0 kgf·cm at 7.4V (equivalent to 416.6 ounces-force per inch) and 26.5 kgf·cm at 6.6V, with speed remaining at 0.07 seconds per 60 degrees at 7.4V and 0.08 seconds at 6.6V, offering additional torque reserve for pilots demanding maximum control authority.
The servo's engineering emphasises precision and reliability through several key construction choices. The brushless motor eliminates the wear characteristics associated with brushed designs, contributing to extended service life and more consistent performance over time. The three-stage metal gearing system, with a reinforced metal final-stage gear, is engineered to withstand the demanding loads imposed by aggressive 3D cyclic inputs whilst maintaining tight tolerances and low backlash. Dual ball bearings support smooth shaft rotation and eliminate the play that would compromise control accuracy. The aluminium case construction provides excellent stiffness and thermal management, critical for maintaining performance consistency during extended flying sessions in variable environmental conditions. Power delivery is managed through the servo's high-voltage electronics, which can be programmed and optimised via PC connection using optional Futaba programming adapters. The servo requires no dry battery power and operates safely across the 4.8V to 8.4V range, making it compatible with modern LiPo battery technology used throughout the RC helicopter hobby in the UK and worldwide.
What's in the Box
- 1× Futaba HPS-HC701 Low Profile Brushless Servo
- Servo horns for control linkage mounting
- Mounting hardware for secure installation in helicopter frames
What You Need to Complete
- RC Helicopter 500–800 size airframe (for which this servo is designed)
- Futaba radio system with receiver supporting PWM, S.BUS or S.BUS2 protocol
- 2S LiPo battery (7.4V nominal) or compatible voltage source (4.8V–7.4V operating range)
- Battery charger compatible with LiPo technology
- CIU-2 or CIU-3 USB adapter (optional, only needed if you wish to reprogram servo modes or adjust settings via PC)
- GPB-1 v4.3 programmer (optional, only required to switch from factory 760µs mode to 1520µs mode)
- Servo linkage rods and control horns (may be included with your helicopter airframe)
Frequently Asked Questions
- Is the Futaba HPS-HC701 suitable for beginner RC helicopter pilots? — This servo is engineered for advanced cyclic control in 3D and F3C freestyle flying disciplines, making it most suitable for experienced pilots who understand aggressive manoeuvre control and servo programming. Beginner helicopter pilots typically start with simpler servo systems. However, if you're building a serious 500–800 size helicopter platform and plan to develop your skills toward competitive flying, the HPS-HC701 is an excellent long-term investment.
- What voltage battery does this servo require and how do I power it? — The Futaba HPS-HC701 operates within a voltage range of 4.8V to 8.4V, with a rated voltage of 6.0V to 7.4V. It is designed to work with 2S LiPo batteries (nominal 7.4V at full charge, falling to approximately 6.0V when partially discharged). You should connect the servo to your RC receiver's servo channels, which are powered by your helicopter's main battery system. Never use dry batteries to power this servo.
- Can I use this servo with my existing Futaba radio system? — The HPS-HC701 supports PWM, S.BUS and S.BUS2 protocols, making it compatible with all modern Futaba receiver systems. If you're using a PWM receiver, connect the servo directly to any channel. For S.BUS or S.BUS2 systems, connect the servo to the S.BUS port on your receiver. The servo will work immediately with no additional programming required.
- What is the difference between 760µs and 1520µs pulse width modes? — Both modes offer the same maximum speed of 0.07 seconds per 60 degrees at 7.4V, but they differ in torque output. The 760µs mode (factory default) provides 27.0 kgf·cm torque at 7.4V, whilst the 1520µs mode increases torque to 30.0 kgf·cm at 7.4V. If you need maximum control authority for aggressive flying, reprogram to 1520µs mode using the optional GPB-1 v4.3 programmer and CIU-2/-3 USB adapter.
- How do I reprogram the servo to switch modes or adjust settings? — Programming requires the optional CIU-2 or CIU-3 USB adapter (sold separately) and the GPB-1 v4.3 programmer software. Connect the servo to the adapter, plug the adapter into your PC, and use the Futaba programming software to adjust parameters including pulse width mode, servo direction and other performance settings. Instructions are available from Futaba's technical documentation.
- Is this servo waterproof and can I use it in wet conditions? — The HPS-HC701 is not explicitly rated as waterproof. Whilst the aluminium case construction offers some protection, you should protect the servo from direct water exposure and excessive moisture. If flying in humid or wet conditions, allow adequate drying time between flights.
- What is the spline size and what control horns are compatible? — The servo features a 25-tooth metal spline with 6mm diameter (25T Ø6mm). Standard Futaba servo horns compatible with this spline specification are included in the box. Ensure any aftermarket horns you purchase are also designed for 25T Ø6mm splines.
- How much torque does this servo produce and is it suitable for my helicopter size? — At 7.4V in 760µs mode, the servo produces 27.0 kgf·cm torque (375 ounces-force per inch). In 1520µs mode, torque increases to 30.0 kgf·cm (416.6 ounces-force per inch). This performance specification makes it ideal for 500–800 size RC helicopters. Verify your helicopter manufacturer's recommendations to ensure servo torque matches your airframe's cyclic control requirements.
- How quickly does this servo respond to control inputs? — Response time is 0.07 seconds per 60-degree rotation at 7.4V and 0.08 seconds at 6.6V, across both 760µs and 1520µs modes. This fast response is critical for maintaining stability and precision during 3D manoeuvres and competitive F3C flying, where delayed servo response can result in loss of aircraft control.
- What weight servo is this and will it add significant weight to my helicopter? — The HPS-HC701 weighs just 56 grams, making it one of the lighter servo options available for high-performance cyclic control. This minimal weight contribution helps maintain your helicopter's optimal centre of gravity and responsiveness without adding burden to servo mounts.
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 HPS-HC701 Low Profile Brushless Servo PWM/S.BUS2 27.0kg 0.07s 4.8V - 7.4V FUT05102718-3 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 Number: FUT05102718-3
- Product Type: HPS-HC701 Low Profile Brushless Servo
- Servo Classification: High Performance Cyclic Servo
- Colour: Black
- Case Material: Aluminium (upper, middle, lower sections)
- Gear Material: Metal (1–3 stage gears with high-strength metal final stage)
- Motor Type: Brushless (HPS custom high-power brushless motor)
- Bearing Type: Dual Ball Bearing construction
- Spline Type: Metal 25-tooth spline (Ø6mm)
- Length: 40.5mm (1.59 inches)
- Width: 21.0mm (0.83 inches)
- Height: 26.2mm (1.03 inches)
- Weight: 56 grams (1.90 ounces)
- Rated Voltage: DC 6.0V – 7.4V
- Operating Voltage: DC 4.8V – 8.4V
- Battery Type: LiPo (2S nominal 7.4V)
- Command Protocol: PWM, S.BUS, S.BUS2
- Programmable: Yes (via optional CIU-2/-3 USB adapter and GPB-1 v4.3 programmer)
- Pulse Width Mode Support: Switchable 760µs (factory default) and 1520µs modes
- Speed at 7.4V (1520µs mode): 0.07 seconds per 60°
- Speed at 6.6V (1520µs mode): 0.08 seconds per 60°
- Speed at 7.4V (760µs mode): 0.07 seconds per 60°
- Speed at 6.6V (760µs mode): 0.08 seconds per 60°
- Torque at 7.4V (1520µs mode): 30.0 kgf·cm (416.6 ounces-force per inch)
- Torque at 6.6V (1520µs mode): 26.5 kgf·cm (368.0 ounces-force per inch)
- Torque at 7.4V (760µs mode): 27.0 kgf·cm (375.0 ounces-force per inch)
- Torque at 6.6V (760µs mode): 24.0 kgf·cm (333.3 ounces-force per inch)
- Circuit Type: Digital
- Size Classification: Low Profile
- Intended Application: RC helicopters 500–800 size, 3D/F3C freestyle flying
- Included Accessories: Servo horns, mounting hardware
- Optional Programming Accessories: CIU-2 or CIU-3 USB adapter (sold separately), GPB-1 v4.3 programmer (sold separately)
- Battery Note: NO DRY BATTERY USE — only use rechargeable LiPo batteries
Product Description of Futaba FUT05102718-3 HPS-HC701 brushless servo
The Futaba FUT05102718-3 HPS-HC701 brushless servo with S.Bus2 is a high-performance cyclic servo engineered for precision control in 500–800 class 3D and F3C helicopters. Designed with a low-profile form factor and housed in a full aluminium case, this black servo delivers exceptional torque and speed for demanding cyclic applications. With a programmable brushless motor, dual pulse width switching, and compatibility with both PWM and S.Bus2 systems, the Futaba FUT05102718-3 low profile cyclic servo 27kg 0.07s offers the responsiveness, durability, and configurability required by advanced pilots. Whether you're executing high-speed maneuvers or fine-tuning flight stability, this servo provides the control authority needed to elevate your helicopter’s performance.
Key features of the Futaba FUT05102718-3 HPS-HC701 brushless servo
- Brushless motor – delivers smooth, high-efficiency operation with minimal wear
- Low-profile design – fits compact cyclic bays in 500–800 class helicopters
- High torque output – 27.0kgf.cm at 7.4V for aggressive cyclic control
- Fast response – 0.07 sec/60° at 7.4V for precise pitch and roll corrections
- Pulse width switching – supports both 760uS and 1520uS for gyro compatibility
- Aluminium case – enhances heat dissipation and structural rigidity
- 25T spline – ensures compatibility with standard Futaba horns and linkages
Why is the Futaba FUT05102718-3 programmable HV servo for helicopters ideal for cyclic control?
The Futaba FUT05102718-3 programmable HV servo for helicopters is specifically designed to handle the intense demands of cyclic control in high-performance rotorcraft. With a torque rating of 27.0kgf.cm and a response time of just 0.07 seconds per 60° at 7.4V, this servo delivers the speed and strength needed for rapid pitch and roll adjustments. Its programmable interface allows users to fine-tune performance parameters, ensuring optimal behavior across different flight modes. Whether you're flying aggressive 3D routines or executing precise F3C transitions, this servo offers the control fidelity required for expert-level maneuvering.
How does the Futaba HPS-HC701 servo with 760uS/1520uS switching enhance compatibility?
Compatibility with modern flight controllers and gyros is critical, and the Futaba HPS-HC701 servo with 760uS/1520uS switching provides flexible signal support to meet this need. Factory-set to 760uS, the servo can be reconfigured to 1520uS using the GPB-1 programmer (v4.3), allowing seamless integration with a wide range of cyclic control systems. This adaptability ensures accurate signal interpretation and responsive actuation, reducing latency and improving flight stability. It’s a vital feature for pilots who demand precision and reliability from their cyclic servos.
What makes the Futaba FUT05102718-3 with aluminium case and 25T spline durable under stress?
Durability is essential in high-torque cyclic applications, and the Futaba FUT05102718-3 with aluminium case and 25T spline is built to withstand the rigors of aggressive flight. The full aluminium housing provides superior heat dissipation and structural integrity, protecting internal components from vibration and impact. The 25T spline ensures secure linkage with standard Futaba horns, minimizing play and maximizing control fidelity. Combined with metal gears and a brushless motor, this construction delivers long-term reliability even under continuous high-load conditions, making it a trusted choice for serious helicopter pilots.
Is the Futaba low profile servo for 500–800 class 3D/F3C helicopters suitable for compact builds?
The Futaba low profile servo for 500–800 class 3D/F3C helicopters is optimized for installations where space is limited but performance cannot be compromised. Measuring just 40.5 × 21.0 × 26.2 mm and weighing 54 g, the servo fits easily into narrow cyclic bays and compact fuselage designs. Its low-profile form factor reduces aerodynamic drag and allows for cleaner cable routing, while still delivering the torque and speed needed for responsive cyclic control. This makes it an ideal solution for high-speed heli setups where every gram and millimeter counts.
How does the Futaba FUT05102718-3 HPS-HC701 brushless servo with S.Bus2 support advanced control systems?
The Futaba FUT05102718-3 HPS-HC701 brushless servo with S.Bus2 supports both PWM and S.Bus2 protocols, allowing it to integrate seamlessly with traditional receivers and advanced digital control systems. S.Bus2 compatibility enables streamlined wiring and centralized configuration, reducing setup complexity and improving reliability. This dual-protocol support ensures that the servo can be used across a wide range of helicopter builds, from legacy systems to cutting-edge telemetry-enabled platforms. It’s a future-proof feature that adds flexibility and scalability to any cyclic control setup.
What performance advantages does the Futaba FUT05102718-3 low profile cyclic servo 27kg 0.07s offer?
Cyclic control demands both speed and strength, and the Futaba FUT05102718-3 low profile cyclic servo 27kg 0.07s delivers on both fronts. With a torque rating of 27.0kgf.cm at 7.4V and a response time of 0.07 seconds per 60°, the servo provides crisp, authoritative cyclic movements that enhance flight stability and maneuverability. This combination of power and speed is especially beneficial during high-speed transitions, flips, and pitch-intensive maneuvers where precision is critical. The servo’s performance profile makes it a top-tier choice for pilots who prioritize control accuracy and responsiveness.
For helicopter pilots seeking a high-speed, high-torque cyclic servo with advanced signal compatibility and rugged construction, the affordable Futaba HPS-HC701 with 0.07s speed and 27kg torque offers unmatched value and reliability. Buy Futaba FUT05102718-3 servo with mounting hardware and horns today.
Technical Specifications of Futaba FUT05102718-3 HPS-HC701 brushless servo
Brand, Model and Product Type
- Brand: Futaba
- Model: FUT05102718-3
- Product Type: Futaba FUT05102718-3 HPS-HC701 brushless servo with S.Bus2, Futaba FUT05102718-3 low profile cyclic servo 27kg 0.07s, Futaba FUT05102718-3 programmable HV servo for helicopters, Futaba FUT05102718-3 with aluminium case and 25T spline, Futaba HPS-HC701 servo with 760uS/1520uS switching
- Product Color: Black
Dimensions
- Product Length: 4.1 cm – compact footprint for tight cyclic servo bays
- Product Width: 2.1 cm – low-profile design for streamlined helicopter builds
- Product Height: 2.6 cm – optimized for minimal interference with rotor mechanics
- Product Weight: 56 g – lightweight for reduced load on servo mounts
- Shipping Weight: 0.11 kg – includes packaging and accessories
Performance Specifications
- Torque at 7.4V (760uS): 27.0 kgf.cm – ideal for aggressive cyclic inputs in 3D/F3C flight
- Torque at 6.6V (760uS): 24.0 kgf.cm – maintains control authority under moderate voltage
- Torque at 7.4V (1520uS): 30.0 kgf.cm – enhanced output for high-speed cyclic response
- Torque at 6.6V (1520uS): 26.5 kgf.cm – reliable performance across voltage range
- Speed at 7.4V: 0.07 sec/60° – rapid actuation for precise cyclic corrections
- Speed at 6.6V: 0.08 sec/60° – consistent responsiveness under lower voltage
Motor and Signal Control
- Motor Type: High-power brushless – delivers smooth, efficient operation with minimal wear
- Signal Compatibility: PWM and S.Bus2 – supports both conventional and digital control systems
- Pulse Width Switching: 760uS (default), switchable to 1520uS via GPB-1 v4.3 – ensures gyro compatibility
Construction and Materials
- Case Material: Aluminium (upper, middle, bottom) – enhances heat dissipation and structural rigidity
- Gear Type: Metal – built for durability under high torque loads
- Spline Count: 25T – compatible with standard Futaba servo horns
Voltage and Power Requirements
- Rated Voltage: DC 6.0V – 7.4V – optimized for high-voltage cyclic servo applications
- Operating Voltage: DC 4.8V – 8.4V – supports a broad range of power sources
- Battery Compatibility: Dry batteries not supported – use regulated power systems only
Application and Use Case
- Servo Type: Low Profile – ideal for 500–800 class helicopters and compact cyclic installations
- Use Case: Cyclic servo for 3D/F3C helicopters – engineered for pitch, roll, and collective control
- Recommended Aircraft: Helicopters requiring fast, high-torque cyclic response
What’s in the Box
- 1 × Futaba HPS-HC701 Low Profile Brushless Servo
- Servo horns
- Mounting hardware
What You Require
- Compatible Futaba transmitter with S.Bus2 support
- Power source within 4.8V to 8.4V range
- GPB-1 programmer (v4.3) for pulse width switching
Sold Separately
- Futaba transmitter with programmable cyclic settings
- CIU-2 / CIU-3 USB adapter for PC configuration
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