How to assemble an ARF RC aircraft step by step
A general ARF assembly workflow for many aircraft: dry fit, hinges, servo installation, power setup, CG, control checks and first-flight preparation.
FZ825 Metal Gear HV Digital Standard Servo 30Kgf.cm 0.12sec for Big-scale RC Planes, Helis and Jets
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Contact RC-MODEL for current availability, technical fit, compatible accessories and a formal quote.
FZ825 Metal Gear HV Digital Standard Servo 30Kgf.cm 0.12sec for Big-scale RC Planes, Helis and Jets is a KST Servos product selected for Helicopter Servos. This page is written for practical buying decisions, with the key fit, size, voltage and performance details organized in one place.
Use it to compare torque, speed, voltage range, construction, dimensions, weight, variants and accessory compatibility before choosing the right component for an RC aircraft, helicopter, car, glider, UAV or workshop installation.
Key Advantages
- Extreme Torque and Excellent Speed
- Two Ball Bearings
- CNC Aluminium Case
- Ideal for Big-scale and Aerobatic Models
Core Specifications
- Voltage Range: DC6.0V-8.4V
- Rated Voltage: DC7.4V
- Motor Type: Coreless DC Motor
- Gear Set Material: Metal Gear
- Ball Bearing: 2BB
- Case Dimensions: 40*20*38mm ±0.2mm
- Weight: 70g±10%
- Item: FZ825 Standard Servo
- Torque: 20Kgf.cm@6.0V, 25Kgf.cm@7.4V, 30Kgf.cm@8.4V
- Speed: 0.15sec/60°@6.0V, 0.14sec/60°@7.4V, 0.12sec/60°@8.4V
- Working Frequency: 1520us/333Hz
- Default Travel Angle: ±50° =100° Total
Relevant RC Academy guides
Learn before you buy
These guides explain the setup, safety checks and accessory choices that usually matter for this product type.
Servo selection: torque, speed, gears and voltage
How to select servos for trainers, sport aircraft, large models, cars and boats without under-sizing a control surface.
How to balance an RC aircraft and find the correct CG
One of the most important setup guides: find the CG, install the flight battery, balance the aircraft and avoid nose-heavy or tail-heavy surprises.
Mandatory pre-flight checks for safer RC flying
A repeatable inspection routine for control direction, radio range, failsafe, battery, fasteners, propeller, CG and field readiness.
How to perform the first test flight of an RC aircraft
Ground checks, takeoff planning, trim passes, battery timing and first landing strategy for a new or repaired RC aircraft.
| Technical Specifications | |
| Manufacturer | KST Servos |
| Brand | KST |
| Product Code | BR0023.0223 |
| All Variant SKUs | BR0023.0223 |
| Rated Voltage | DC7.4V |
| Voltage Range | DC6.0V-8.4V |
| Working Frequency | 1520us/333Hz |
| Default Travel Angle | ±50° =100° Total |
| Temperature Range | -20℃……+65℃ |
| Motor Type | Coreless DC Motor |
| Gear Set Material | Metal Gear |
| Position Sensor | Potentiometer |
| Ball Bearing | 2BB |
| Case Dimensions | 40*20*38mm ±0.2mm |
| Weight | 70g±10% |
| KST Collections | Helicopter Servos, Industrial, Standard Servos, FZ Series |
| Series | FZ Series |
| Size Class | Standard Servos |
| Application | Helicopter Servos |
| Features | Extreme Torque and Excellent Speed; Two Ball Bearings; CNC Aluminium Case; Ideal for Big-scale and Aerobatic Models |
| Package Includes | 1 * FZ825 Servo; 1 pack of accessories; Download; Technical Specification for FZ825 Servo |
| Item | FZ825 Standard Servo |
| Torque | 20Kgf.cm@6.0V, 25Kgf.cm@7.4V, 30Kgf.cm@8.4V |
| Speed | 0.15sec/60°@6.0V, 0.14sec/60°@7.4V, 0.12sec/60°@8.4V |
| Product Type | RC |
Tags: KST Servos, BR0023.0223, Helicopter Servos, Industrial & UAV Servos, Standard Servos, FZ Series, Gears, RC servo