DS315MG has a hardened steel drive train and a coreless motor capable of running from 4.8V to 8.4V (4 cell NiMH to 2S LiPo) meaning these servos will deliver the power and reliability you need. They are super high speed with pretty good torque.
DS315MG 8.4V Digital Metal Gear Mini Servo 4.8kg 0.07sec for RC Helicopters
Features
CNC Aluminium Case
Programmable
2 Ball Bearings
With 12mm Coreless Motor
High Precision Metal Gear
Large Stall Torque of 4.8Kg
Lightweight and Compact Design
Specification
Item: DS315MG V8.0 Mini Servo
Rated Voltage: DC6.0V
Voltage Range: DC4.8V-8.4V
Torque: 2.8Kgf.cm@4.8V / 3.5Kgf.cm@6.0V / 4.3Kgf.cm@7.4V / 4.8Kgf.cm@8.4V
Speed: 0.10sec/60°@4.8V / 0.09sec/60°@6.0V / 0.08sec/60°@7.4V / 0.07sec/60°@8.4V
Working Frequency: 1520μs/333Hz
Default Travel Angle: ±70°=140° Total
Temperature Range: -20℃……+65℃
Soft Start: Programmable
Programmable: Yes
Case Material: Aluminium Alloy
Motor Type: Coreless DC Motor
Gear Set Material: Hardened Steel
Position Sensor: Potentiometer
Ball Bearing: 2BB
Case Dimensions: 23mm*12mm*27.5mm±0.2mm
Weight: 20g±10%