Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience 'brown-outs' where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver smoothing the current delivery. However, in some cases, you may need to install an external BEC. Power HD D15 15kg 8.4v Low Profile Digital Servo, High Performance Coreless Servo. FeaturesSuitable for RC cars 1/10 scale on/off road and drifting. . HV Brushless Servo. . High power Coreless Motor. . Upper/middle/bottom: Aluminium Case. . Servo Dimensions Total Height (A ) = 31mm. Body Width (B ) = 41mm. Below Mount (C ) = 16mm. Above Mount (D ) = 12mm. Total Length (E ) 54mm. Total Width (F ) = 20mm. How To: Install a ServoIn this video, Hamish gives a step-by-step guide on installing a Servo and how to avoid stripping your servo gears. SpecificationsSpecifications. 6.0V. 7.4V. 8.4V. Torque (kg-cm). 13.5. 16.5. 18.0. Torque (oz/in). 187.5. 229.1. 250.0. Speed (sec). 0.10. 0.095. 0.085. Operating Voltage (DCV). 6.0 ~ 8.4. Weight (g). 55.0. Bearing Type. Ball Bearing x 2. Motor Type. Coreless Motor. Gear Type. Titanium & Steel. Operating Temperature (°C). -20 to 60. Working Frequency. 1520?s / 333Hz. Size (mm). 41.0 x 20.0 x 26.3. Size (in). 1.61 x 0.79 x 1.04. Included itemsDescription. QTY. Power HD D15 15kg 8.4v Low Profile Digital Servo. 1. Accessory Pack. 1.