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.

Savox - SB-2283MG Digital High Voltage Brushless Motor Servo, Metal Gear

Features

Leading edge digital servo technology
High efficiency Brushless motor
Accurate and fast response
Super high resolution
Aluminium case for improved motor cooling and total strength
Ball beared
Precision Metal gears

Technical specifications:

Servo Technology: Digital High Voltage
Input Voltage (V): 6.0V - 7.4V
Servo Type / Size: Standard
Motor Type: Brushless Motor
Gear Material: Metal Gears
Ball Beared: Ball Beared
Servo Case: Aluminium
Speed 60°/Sec @ 7.4V: 0.048 Sec/60°
Torque kg/cm @ 7.4V: 10.0 Kg/cm
Length (mm): 40.3 mm
Width (mm): 20.2 mm
Height (mm): 38.7 mm
Weight (g): 76 g
Connector type: JR
Spline size: 25T Spline

SAV-SC-1268SG Servo Specifications

Total Height (A) = 38.7mm
Body Width (B) = 40.3mm
Below Mount (C) = 25.9mm
Above Mount (D) = 11.7mm
Total Length (E) = 54mm
Total Width (F) = 20.2mm

Savox SB-2283MG Standard 10kg 7.4V Brushless Metal Geared Servo

Savox SB-2283MG Standard 10kg 7.4V Brushless Metal Geared Servo