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.
A20-3813 V8.0 Brushless HV Phosphor Bronze & Hardened Steel Gear Servo 43Kgf.cm 0.12sec/60degree
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A20-3813 V8.0 Brushless HV Phosphor Bronze & Hardened Steel Gear Servo 43Kgf.cm 0.12sec/60degree is a KST Servos product selected for Aircraft Servos, Car Servos, Industrial & UAV 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
- Hardened steel gears
- Extreme torque and excellent speed
- CNC aluminium case
- Brushless DC motor
Core Specifications
- Voltage Range: DC6.0V-8.4V
- Rated Voltage: DC7.4V
- Motor Type: Brushless DC Motor
- Gear Set Material: Hardened Steel
- Ball Bearing: 2BB
- Weight: 72g±10%
- Item: A20-3813 Brushless HV Servo
- Torque: 30Kgf.cm@6.0V, 38Kgf.cm@7.4V, 43Kgf.cm@8.4V
- Speed: 0.18sec/60°@6.0V@25℃, 0.13sec/60°@7.4V@25℃, 0.12sec/60°@8.4V@25℃
- Working Frequency: 1520μs/333Hz
- Default Travel Angle: ±50°=100°Total
- Operating Temperature Range: -10℃...... +65℃
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 | BR0023.0140 |
| All Variant SKUs | BR0023.0140 |
| Rated Voltage | DC7.4V |
| Voltage Range | DC6.0V-8.4V |
| Working Frequency | 1520μs/333Hz |
| Default Travel Angle | ±50°=100°Total |
| Case Material | Aluminum Alloy |
| Motor Type | Brushless DC Motor |
| Gear Set Material | Hardened Steel |
| Position Sensor | Potentiometer |
| Ball Bearing | 2BB |
| Weight | 72g±10% |
| KST Collections | Aircraft Servos, Car Servos, Industrial, Industrial Servos, Standard Servos, A Series |
| Series | A Series |
| Size Class | Standard Servos |
| Application | Aircraft Servos, Car Servos, Industrial & UAV Servos |
| Features | Hardened steel gears; Extreme torque and excellent speed; CNC aluminium case; Brushless DC motor |
| Package Includes | 1 * A20-3813 Brushless HV Servo; 1 * Pack of Accessories; Download; A20-3813 Servo Technical Specification |
| Item | A20-3813 Brushless HV Servo |
| Torque | 30Kgf.cm@6.0V, 38Kgf.cm@7.4V, 43Kgf.cm@8.4V |
| Speed | 0.18sec/60°@6.0V@25℃, 0.13sec/60°@7.4V@25℃, 0.12sec/60°@8.4V@25℃ |
| Product Type | RC |
| Operating Temperature Range | -10℃...... +65℃ |
| Shielded Connecting Cable | 22AWG |
| Case Dimension | 40.5mm*20mm*38mm±0.2mm |
Tags: KST Servos, BR0023.0140, Aircraft Servos, Car Servos, Industrial & UAV Servos, Standard Servos, A Series, Gears, RC servo