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DS8917HV Ultra Speed Servo

by JR (JRPS8917HV)

$149.99
Reg: $219.99

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Product Description

Key Features

  • SuperSteel™ gears for continuous slop-free operation
  • Designed for high-voltage, direct 2S Li-Po/Li-Fe battery source
  • High speed provides heli pilots with the responsiveness they need
  • Standard size—fits in all helis 50-size and larger
  • Digital precision provides great accuracy and performance

Overview

The JR® 8917HV servo is the perfect choice for heli pilots who want high-speed servos and the JR reputation for incredible servo performance. The 8917HV servo provides pilots with everything they need—high speed, the use of Li-Pos without a regulator and the outstanding JR 3-year limited warranty.

Battery chemistries such as Li-Po, Li-Ion, and Li-Fe have become very popular within the RC community. They are the standard for powering electric motors and have also gained popularity as receiver battery packs. The issue is the output voltage of these batteries is higher then the previous standard 4- and 5-cell Ni-Cd and Ni-MH packs, 4.8V and 6V respectively. The higher voltage is not an issue with the receivers but can be for the servos. Many servos will not operate at these higher voltages for very long before burning out the motors or electronics.

To get around this issue modelers have had to use a regulator to drop the voltage to an acceptable operating range for their servos, usually around 5–6 volts. The addition of a regulator adds a component that, should it fail, can cause the loss of a model.

JR’s HV servos are designed with motors and electronics that operate off the direct voltage of a 2-cell Li-Po, Li-Ion, or Li-Fe receiver battery pack (6.6–7.4V nominal voltage). This eliminates the need for a regulator and lowers the chance for a power failure that can cause a catastrophic failure of your model. Also note that the HV servo specs are shown at the higher voltage (7.4V 2S Li-Po) but will still operate on a standard 5-cell 6V Ni-Cd, Ni-MH battery with a reduction in performance of approximately 10% in speed and torque.

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