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.

In this video, Hamish gives a step-by-step guide on installing a Servo and how to avoid stripping your servo gears.

Power HD brings a range of crawler specific high-torque & high-voltage servos. With three variants; 40kg/cm, 30kg/cm, & 20kg/cm featuring a waterproof case & wiring system.

• Servo case is CNC machined, ensuring higher quality

• Customised Power HD waterproofing system

• Uses Hardened Steel Gears for extra strength and durability

• The 32-bit high-frequency MCU creates more precise operation with locked-rotor & power-on slow-start protection

• Casing is anodized in Blue

• Torque(6.0V): 15.0 kg-cm (208.3 oz/in)

• Torque(7.4V): 18.0 kg-cm (250.0 oz/in)

• Torque(8.4V): 20.0 kg-cm (277.7 oz/in)

• Speed: 0.11 sec (6.0V) ? 0.09 sec (7.4V) ? 0.08 sec (8.4V)

• Operating Voltage?6.0 ~ 8.4 DC Volts

• Weight: 82.0 g (2.89 oz)

• Bearing Type?Ball Bearing x 2

• Motor Type?Coreless Motor

• Gear Type?Titanium & Steel

• Operating Temperature?-20?~60?

• Working frequence?1520?s / 333hz

• Size?40.7 x 20.5 x 38.5 mm (1.60 x 0.81 x 1.52 in)

Power HD WH-20KG Coreless Servo Dimensions

• Total Height (A) = 44mm

• Body Width (B) = 40.7mm

• Below Mount (C) = 28mm

• Above Mount (D) = 16mm

• Total Length (E) = 20.6mm

• Total Width (F) = 54.2mm