JR Propo DS8900G 3.5Kg.cm/0.05s Digital Tail Servo

Price: £49.95  £34.95
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  • The ultimate tail servo perfect for use in competition helicopters.
  • Ultra-speed servo for instant tail control reaction.
  • Aluminum heatsink centre case to help keep motor cool and increase efficiency.
  • Ultra Precision Nylon Gears.
  • Perfect for 600-size and larger helis.
  • JR's legendary digital holding power and resolution.
  • High Frequency Response System.
  • Dual Ball Bearing.


The DS8900G is the ultimate tail servo with it's high speed of 0.05s per 60 degrees it is perfect for use in 600 size and larger competition helicopters. The DS8900 has an Aluminum heatsink centre case to help keep motor cool and increase efficiency.

Supplied with mounting hardware and additional servo output arms. The DS8900G is dual ball raced and can only be used at 4.8v.


Dimensions:35 x 21 x 40.5mm

JR Servos and 4.8v

JR design their range of servos around the voltage of a 4 cell Ni-Cd or Ni-Mh battery. These batteries are rated at 4.8v but this is a nominal voltage for the battery pack. A 4 cell battery will reach slightly over 6v when fully charged.

With modern Li-Po and Li-Fe batteries being widely used, regulated power supplies are becoming common place in model aircraft to help keep the weight down, keep a stable voltage and to aid in high power situations on large aircraft with high power servos. The use of a regulated power supply upto 6v is fine to use.

However using a 5 cell Ni-Mh battery which is rated at 6v is not ok to use, this battery will reach over 7v when fully charged and may damage the servo. If you are looking to use this type of battery we would recommend the HV, WV or NX range of JR servos which can handle this extra voltage.

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This product was added to our catalog on Monday 12 February, 2018.