Overview

The Futaba HPS-H701 is a professional-grade standard brushless servo designed for demanding RC helicopter and high-performance aircraft applications. This is a servo engineered for pilots who demand precision, reliability and raw control authority in their large-scale RC models. Whether you're operating a collective pitch helicopter, fixed-wing aerobatic aircraft, or any RC application requiring fast, powerful servo response, the HPS-H701 delivers exceptional performance in a compact, lightweight package that fits standard servo bays across the UK RC hobby market.

Featuring brushless motor technology, the HPS-H701 achieves remarkable speed and torque whilst maintaining the efficiency and durability that professional RC pilots expect. The servo supports multiple control protocols including PWM, S.BUS and S.BUS2, making it compatible with a wide range of modern Futaba radio systems and receivers. With its aluminium case construction, metal gears and advanced brushless motor, this is a servo built to withstand the rigours of intensive flying and demanding control inputs.

Futaba has established itself as a leader in RC radio control since 1962, and the HPS-H701 represents the pinnacle of servo engineering. This servo is ideal for experienced RC pilots, competition flyers and serious enthusiasts who refuse to compromise on control quality or reliability. If you're looking for a high-performance brushless servo in the UK RC market, the HPS-H701 is the natural choice for large helicopters and high-performance aircraft.

Key Features

• Brushless Motor Architecture — The HPS-H701 uses brushless motor technology rather than traditional brushed designs, which means zero brush wear, longer operational lifespan, superior efficiency and consistent performance across thousands of flight hours. This technology is essential for serious RC pilots who need reliable, maintenance-free servo operation.
• Exceptional Torque Output of 40.0kg at 7.4V — With 40.0 kilogram-force centimetres of torque at 7.4V and 36.0 kgf·cm at 6.6V, the HPS-H701 delivers extreme control authority for cyclic and tail surfaces on large helicopters. This torque specification means your servo will hold position against wind forces, aerodynamic loads and aggressive control inputs without hesitation or lag.
• Lightning-Fast Speed of 0.07 Seconds — The servo completes a 60-degree sweep in just 0.07 seconds at 7.4V (0.075 seconds at 6.6V), providing the rapid response required for precise helicopter control, aerobatic manoeuvres and real-time flight corrections. This speed is critical for maintaining stability in collective pitch systems and fixed-wing control surfaces.
• Multi-Protocol Control Support — The HPS-H701 supports PWM, S.BUS and S.BUS2 command protocols, giving you complete flexibility to integrate with any Futaba radio system or third-party S.BUS2 compatible receiver in your RC setup. This future-proofs your investment and ensures compatibility with both traditional and modern RC radio architectures.
• Compact Standard Size Housing — Measuring just 40.5 × 21.0 × 37.8mm and weighing only 76 grams, the HPS-H701 fits standard servo bays found on large helicopter frames, fixed-wing platforms and other RC models across the UK RC hobby. The compact footprint is ideal for tight mounting spaces in cyclic and tail setups where multiple servos operate in close proximity.
• Aluminium Case Construction — The servo features upper, middle and lower aluminium case components that provide structural rigidity, vibration damping and excellent heat dissipation during extended flight sessions. Aluminium construction ensures durability without excessive weight, maintaining the servo's lightweight profile whilst resisting impact damage.
• Metal Gears with Titanium Final Stage — The HPS-H701 employs a three-stage metal gear train with a titanium final stage gear, delivering superior strength and precision compared to plastic alternatives. Metal gears reduce backlash, improve centering accuracy and withstand the high torque loads demanded by helicopter control surfaces without stripping or slipping.
• Dual Ball Bearing Motor Support — The brushless motor is supported by dual ball bearings on both sides of the rotor, minimising friction, reducing heat generation and ensuring smooth, reliable rotation across the servo's full operating lifespan. This bearing arrangement is characteristic of professional-grade servos and directly contributes to the HPS-H701's exceptional speed and efficiency.
• 25-Tooth Spline Output — The servo features a 25-tooth spline with 6mm diameter shaft, which is the industry-standard servo spline found on virtually all RC helicopter horns and servo arms. This universal compatibility means you can source horns from any major RC supplier in the UK market without adapter plates or modifications.
• Wide Voltage Range from 4.8V to 7.4V — The servo operates safely anywhere from 4.8V (two 2S LiPo packs) through to 7.4V (one 2S LiPo pack), allowing you to optimise performance based on your power system and application. Running at 7.4V delivers maximum torque and speed, whilst 4.8V operation provides a lower-power option for specific flight conditions or to extend battery life.

Technical Performance

The Futaba HPS-H701 represents the convergence of brushless servo technology and professional-grade engineering. The HPS brushless motor is specifically designed for high-performance RC applications, delivering consistent torque output across the entire voltage range without the power loss and heat generation associated with traditional brush-type servo motors. The metal three-stage gear train with titanium final stage is precision-machined to minimise backlash whilst handling the substantial torque loads placed on helicopter cyclic and tail servos during aggressive flying. The dual ball bearing motor support system ensures that the brushless rotor rotates with minimal friction, enabling the servo to achieve its rapid 0.07-second transit speed whilst maintaining thermal efficiency during extended flight sessions.

The aluminium case construction serves both functional and protective purposes: the upper, middle and lower case sections are precisely machined to provide a rigid structural frame that resists deformation under load, whilst the aluminium material conducts heat away from internal components during high-demand operations. This is particularly important for large helicopter applications where cyclic servos operate continuously throughout the flight, adjusting swashplate angle dozens of times per second. The servo's compact 40.5 × 21.0 × 37.8mm footprint combined with its 76-gram weight makes it suitable for installation in standard servo bays found on modern collective pitch helicopter frames manufactured by leading brands across the UK RC market.

Electrical performance is equally impressive: the HPS-H701's support for PWM, S.BUS and S.BUS2 protocols ensures compatibility with the full range of Futaba radio systems, from conventional multi-channel transmitters to modern digital systems offering telemetry and advanced control features. The servo accepts voltage input anywhere from 4.8V to 7.4V, allowing integration into power systems ranging from simple four-cell NiMH receiver packs through to modern LiPo battery configurations. At maximum voltage (7.4V), the servo delivers 40.0 kgf·cm of torque and completes a 60-degree arc in 0.07 seconds, making it one of the fastest and strongest standard-size servos available to UK RC pilots operating large helicopters and demanding fixed-wing applications.

What's in the Box

• 1x Futaba HPS-H701 Standard Brushless Servo
• Servo horns (multiple configurations included)
• Mounting hardware (servo frame and fasteners)

Frequently Asked Questions

• Is the Futaba HPS-H701 brushless servo suitable for large helicopter control applications? — Yes, absolutely. The HPS-H701 is specifically engineered for large helicopters requiring high torque and rapid response. The 40.0kg torque specification and 0.07-second speed make it ideal for cyclic pitch control and tail servo applications on collective pitch helicopters commonly flown by serious RC pilots across the UK. The servo's brushless motor design also means lower power consumption compared to traditional brushed servos, extending flight times when multiple HPS-H701 servos are installed in a single helicopter.
• What voltage does the HPS-H701 require and what batteries are compatible? — The HPS-H701 operates across a wide voltage range from 4.8V to 7.4V, giving you flexibility in receiver power system design. At 4.8V, the servo runs on a standard four-cell NiMH battery pack commonly used in RC receivers, whilst 7.4V operation requires a 2S LiPo battery pack. At maximum voltage (7.4V), the servo delivers full 40.0kg torque and 0.07-second speed specifications. Many UK RC pilots use dedicated servo LiPo batteries in their helicopters to maximise control authority whilst maintaining separate main flight batteries.
• What radio systems and receivers are compatible with the HPS-H701? — The HPS-H701 supports PWM, S.BUS and S.BUS2 command protocols, making it compatible with all modern Futaba radio systems and any third-party receiver offering S.BUS2 compatibility. This gives you enormous flexibility whether you're running a classic multi-channel Futaba system or a modern digital radio with telemetry features. The servo accepts standard servo connector plugs found on all Futaba receivers and S.BUS2 compatible systems across the UK RC market.
• How does the brushless motor in the HPS-H701 compare to traditional brushed servos? — Brushless servo technology eliminates carbon brush wear, which means your HPS-H701 requires virtually no maintenance and will operate reliably for thousands of flight hours without degradation. Brushless motors also run cooler and more efficiently than brushed alternatives, consuming less current from your receiver battery and generating less heat during extended flying sessions. The HPS-H701's brushless design is one reason it's preferred by professional RC helicopter pilots and competition flyers who demand absolute reliability.
• What makes the metal gears and titanium final stage important in this servo? — Metal gears provide superior strength and precision compared to plastic gears, essential when handling the high torque loads generated during helicopter flight. The titanium final stage gear is particularly important because it's the gear most directly engaged with your servo horn, directly transmitting torque to control surfaces. Titanium offers exceptional hardness and wear resistance, meaning your HPS-H701 will maintain precise centering and zero backlash flight after flight, month after month, without any gear wear or slipping.
• Is the HPS-H701 suitable for beginners or is it only for advanced RC pilots? — Whilst the HPS-H701 is a professional-grade servo, it's appropriate for any RC pilot operating a large helicopter or demanding fixed-wing aircraft, regardless of experience level. The servo's reliability and consistent performance actually make it an excellent choice for learning because you can focus on flying without worrying about servo performance issues. However, this is not an entry-level servo for small micro helicopters or basic trainers — it's designed for serious large-scale RC aircraft where control authority and response speed are critical safety factors.
• What is the difference between PWM and S.BUS2 control protocols on the HPS-H701? — PWM (Pulse Width Modulation) is the traditional servo control method using individual wires from your receiver, where each servo requires a separate channel. S.BUS2 is a digital protocol that allows multiple servos to be controlled through a single data line, reducing wiring complexity and receiver clutter. The HPS-H701's support for both protocols means you can integrate it into either traditional or modern receiver architectures depending on your preference and existing equipment. Many UK RC pilots prefer S.BUS2 for its simplified wiring and additional telemetry capabilities.
• How does the servo's 0.07-second speed translate to real-world flight performance? — A 0.07-second transit speed means the servo completes a full 60-degree control surface movement in just 70 milliseconds, providing the rapid response required for smooth helicopter flight and aerobatic manoeuvres. This speed is essential for cyclic pitch control where small, quick adjustments maintain stability in wind, and for tail servo response where rapid authority corrections prevent uncommanded rotation. For fixed-wing aerobatic flying, this speed enables crisp, responsive control inputs that professional RC pilots demand during inverted flight and aggressive manoeuvres.
• Does the HPS-H701 come with servo horns and what spline size does it use? — Yes, the servo comes with multiple servo horns and mounting hardware included in the box. The HPS-H701 uses a standard 25-tooth spline with 6mm diameter shaft, which is the universal standard servo spline found on RC helicopter and aircraft control horns throughout the UK hobby market. This means you can source replacement horns from any major RC supplier without compatibility concerns.

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-H701 Standard Brushless Servo PWM/S.BUS2 40.0kg 0.07s 4.8V - 7.4V FUT05102721-3 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.