Introduction
The Stemedu BLS-HV70MG is a high-performance 70KG brushless digital servo designed for demanding RC applications. Featuring an all-metal, IP67 waterproof construction, it delivers high torque and speed for 1/8 and 1/10 scale RC vehicles, helicopters, and airplanes. This manual provides essential information for proper setup, operation, and maintenance to ensure optimal performance and longevity.
A front-side view of the red and black Stemedu BLS-HV70MG 70KG High Torque Brushless RC Digital Servo, highlighting its robust construction.
Product Features
- High Torque & High Speed: Outputs 71kg.cm torque at 8.4V and 55kg.cm at 4.8V. Achieves a high-speed response of 0.11 seconds/60° at 8.4V and 0.13 seconds/60° at 4.8V.
- Brushless Motor: Utilizes an efficient brushless motor for extended lifespan (40% longer than traditional brushed motors), low-noise operation, and stable performance in high-voltage RC equipment.
- IP67 Waterproof: The fully sealed metal casing provides IP67 waterproof protection, allowing the servo to withstand water immersion and operate reliably in wet, snowy, or extreme outdoor conditions.
- All-Metal Gear & Case: Constructed with durable stainless steel gears and a CNC aluminum alloy case for enhanced durability, precise control, reduced noise, and extended lifespan.
- Flexible Control & Versatility: Offers a 270° control angle (PWM from 500µs to 2500µs), making it suitable for a wide range of high-load applications including 1/5 to 1/10 ratio remote control vehicles, ships, and robots.
Specifications
This image displays the Stemedu BLS-HV70MG servo alongside a table detailing its technical specifications, including signal type, motor type, operating voltage, torque, and dimensions.
| Feature | Detail |
|---|---|
| Signal Type | Digital |
| Motor Type | Brushless |
| Dead Band | ≤3µsec |
| Operating Voltage | 4.8V-8.4V |
| Control System | PWM (1520us/333Hz) |
| Mechanical Angle | 360° |
| Bearing | Two Ball Bearings |
| Operating Travel | 270°±10° (500-2500uSec) |
| Operating Speed (sec/60°) | 0.12 (8.4V), 0.14 (7.4V), 0.17 (6.0V), 0.21 (4.8V) |
| Max. Operating Travel Angle | 358°±10° (500-2500uSec) |
| Connector Wire | 300mm±5mm |
| Gear Material | Stainless steel |
| Shell Material | Aluminum Alloy |
| Horn Gear | 25T |
| Dimension | 40 x 20 x 39.8 mm (1.57 x 0.79 x 1.6 inches) |
| Weight | 85g (3.0oz) |
| Torque (4.8V) | 58 kg-cm (2,045 oz-in) |
| Torque (6.0V) | 62 kg-cm (2,186 oz-in) |
| Torque (7.4V) | 68 kg-cm (2,398 oz-in) |
| Torque (8.4V) | 71 kg-cm (2,504 oz-in) |
This diagram provides precise measurements of the Stemedu BLS-HV70MG servo, crucial for proper installation and fit within RC models.
What's in the Box
- 1 x Stemedu BLS-HV70MG Servo
- Assorted Servo Horns (plastic and aluminum)
- Mounting Hardware (screws, brass inserts)
Setup
- Mounting: Securely mount the servo in your RC model using the provided screws and brass inserts. Ensure the servo is firmly seated to prevent movement during operation.
- Connecting: Connect the servo's signal wire to the appropriate channel on your receiver. Ensure the polarity is correct (signal, positive, negative). If using a high-voltage setup (above 6.0V), ensure your receiver and BEC (Battery Eliminator Circuit) can handle the voltage or use an external BEC.
- Attaching Servo Horn: With the servo connected and powered on (and the RC system centered), carefully attach the desired servo horn to the output shaft. Ensure the horn is centered before tightening the screw. Choose a servo horn appropriate for your application; the kit includes various plastic and an aluminum horn.
- Initial Calibration: Power on your RC transmitter and receiver. Verify that the servo responds correctly to steering inputs. Adjust end-points and sub-trim on your transmitter as needed to achieve the desired range of motion and center position without binding.
This image shows the Stemedu BLS-HV70MG servo with different types of servo horns, illustrating the variety of attachments available for different applications.
Operating
- Voltage Range: The servo operates within a voltage range of 4.8V to 8.4V. For optimal performance and torque, an 8.4V (2S LiPo) power source is recommended.
- Control Angle: The servo provides a 270° control angle when the PWM signal ranges from 500µs to 2500µs. Ensure your RC system is configured to utilize this full range if desired.
- Environmental Use: Due to its IP67 waterproof rating, the servo is designed to operate in wet conditions. However, prolonged submersion or exposure to corrosive liquids should be avoided. After use in wet conditions, it is recommended to clean and dry the exterior of the servo.
This image visually represents the 270-degree range of motion of the servo, showing how the control arm rotates within this angle.
Maintenance
- Regular Inspection: Periodically inspect the servo for any signs of damage, loose connections, or excessive wear on the gears.
- Cleaning: Keep the servo clean from dirt, dust, and debris. Use a soft brush or compressed air for cleaning. For wet conditions, rinse with fresh water and dry thoroughly.
- Gear Check: While the gears are metal, inspect them for any play or grinding noises. If issues arise, consider professional inspection or replacement.
- Waterproofing Seal: Ensure the seals around the casing remain intact, especially after impacts or prolonged use in harsh environments, to maintain its IP67 rating.
Troubleshooting
- Servo Not Responding:
- Check all connections to the receiver and power source.
- Verify the receiver and transmitter are powered on and bound.
- Ensure the battery has sufficient charge.
- Test with a different servo or receiver channel if possible.
- Erratic Movement/Glitching:
- Check for radio interference.
- Ensure power supply is stable and sufficient (consider a BEC if voltage drops).
- Inspect wiring for damage.
- Check for mechanical binding in the linkage.
- Overheating:
- Ensure the servo is not under constant load or binding.
- Verify operating voltage is within specified limits.
- Check for proper ventilation around the servo.
- Excessive Noise:
- Some digital servos produce a slight buzzing sound; this is normal.
- Loud grinding or clicking may indicate gear damage or binding. Inspect gears and linkages.
Warranty
This product is covered by a limited manufacturer's warranty against defects in materials and workmanship. Please refer to the retailer's return policy or contact the manufacturer directly for specific warranty terms and conditions. Keep your proof of purchase for warranty claims.
Support
For technical assistance, troubleshooting, or parts inquiries, please contact Stemedu customer support through their official website or the retailer where the product was purchased. Provide your product model number (BLS-HV70MG) and a detailed description of the issue for faster service.
