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Futaba BLS373SV HV Brushless S-Bus2 Servo (0.11s/37Kg)


The BLS373SV is an extremely high specification HV servo from Futaba designed with 1/5 car racing in mind. It supports the ultra-fast SR (Super Response) mode used in the T7PX transmitter for the best reaction and 'feel' available. It is programmable (using the optional CIU-2 / CIU-3 USB adapter) and is compatible with both S.Bus and S.Bus2 systems. The final gear and output horn splines are machined from strong stainless steel for extreme durability in demanding situations. To cope with the extreme torque on offer the case was re-designed to include extra bracing for the output shaft. The electric motor is brushless to produce both speed and torque while simultaneously increasing the reliability and life. The BLS373SV was designed for high-voltage power and can be used with a 2S LiPo battery directly to extract the highest performance levels.


  • 37kg.cm torque with a metal gearbox
  • High-Voltage
  • Brushless motor
  • Strong ball bearings
  • Robust aluminium housing
  • High resolution
  • High accuracy
  • Low-wear potentiometer
  • Water resistant

Advantages of brushless motor technology:

  • 30% faster response time
  • Better acceleration
  • More resistant to vibration and shock
  • High efficiency, thus lower engine heating
  • No carbon brush wear, resulting in 5 times motor life
  • Special gearbox with minimum backlash
  • Cobalt Samarium Motor Magnets
  • Highest resolution
  • Same power consumption as conventional digital servos

The following parameters are programmable:

  • S.BUS channel assignment
  • Servo Reversal
  • Servo type (Normal/Retractable landing gear)
  • Soft start (On/Off)
  • Mode selection in case of signal failure Hold or Free
  • Soft servo run (On/Off)
  • Servo position (Servo Tester)
  • Servo-pitch adjustment +/- 300 µs (about 30 degrees)
  • Servo speed
  • Dead band setting
  • Servo travel adjustment (left and right individually)
  • Starting power
  • Attenuation
  • Holding force
  • ID storage


  • Case: Metal
  • S.BUS: S.Bus & S.Bus2
  • Futaba SR Mode: Yes
  • Weight: 84g
  • Bearings: Ballraced
  • Torque: 31 kg.cm @ 6V
  • Torque: 37 kg.cm @ 7.4V
  • Voltage: 4.8 - 7.4V
  • Speed: 0.11 sec/60° @ 7.4V
  • Speed: 0.14 sec/60° @ 6V
  • Dimensions: 40.5 x 21.0 x 38.4mm
  • Electric Motor: Brushless

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£219.99 Each

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