Model: LH120

　　Wheelbase: 2100mm (four axis eight propeller)

　　Payload capacity:50 KG

　　Tethered hovering height: 100 meters

　　Wind resistance: Wind force 7

　　Hanging time: ≥ 12 hours

　　Onboard power supply power: 24-30KW

　　Municipal power/generator: AC380V

　　Application scenarios: Fire rescue, tactical transportation, civilian logistics, etc.

　　Working principle of Tethered Drone

　　The Tethered Drone is connected to a ground power source through a cable, enabling long-term aerial hovering and mission execution.

　　The mooring box converts the single-phase 220V (or three-phase 380V) AC power provided by the generator (mains power) into high-voltage DC power DC400-1500V and outputs it to the mooring cable. After being stepped down by the onboard power supply, it is converted into a DC stabilized output suitable for Drone Power Supply (such as 50V for 12S), providing a long endurance power supply mode for the drone.

　　Application areas of Tethered Drone

　　The application of Tethered Drone is very extensive, including but not limited to emergency rescue (emergency lighting, emergency communication, high-rise firefighting), military (intelligence surveillance, electro-optical reconnaissance, radar electronic warfare), public safety (relay self-organizing network, environmental monitoring), and civilian (nighttime power repair, high-rise building cleaning/spraying). These application scenarios require drones to remain in a fixed position for a long time to complete specific tasks.

　　LH-120 Tethered Drone System: A Comprehensive Guide to Structure, Transport, Maintenance, and Solutions

　　The LH-120 Tethered Drone System redefines persistent aerial intelligence, security, and communication. Engineered for missions requiring uninterrupted flight times spanning hours, days, or even weeks, it is the ideal solution for critical infrastructure monitoring, public safety operations, and large-scale event security. This comprehensive guide delves into the robust structure of the LH-120, outlines crucial transportation and maintenance protocols, and explores its versatile application solutions for B2B clients worldwide.

　　Structural Overview: Engineered for Endurance and Reliability

　　The LH-120 is not a modified consumer drone; it is a purpose-built aerial system designed from the ground up for the unique demands of tethered operation. Its architecture prioritizes stability, power efficiency, and resilience.

　　1. The Aerial Vehicle: Maximized Stability and Performance

　　The airframe is constructed from a combination of carbon fiber composites and high-strength engineering plastics. This material selection ensures a lightweight yet incredibly rigid structure capable of withstanding prolonged operation in challenging weather conditions, including sustained winds.

　　Multi-Rotor Configuration: The LH-120 utilizes a hexacopter (6-rotor) design. This configuration provides inherent redundancy; in the unlikely event of a single motor or propeller failure, the remaining five can maintain stable flight, allowing for a controlled and safe landing.

　　High-Efficiency Brushless Motors and Propellers: The drone is equipped with custom-wound, high-torque brushless motors paired with large-diameter, low-pitch propellers. This combination is optimized not for speed, but for maximum thrust-to-power ratio, ensuring efficient lift and stable hover over extended periods.

　　Integrated Avionics and Redundant Systems: The flight controller is a specialized unit hardened against electromagnetic interference from the tether power system. It features redundant Inertial Measurement Units and a high-precision GNSS (GPS/GLONASS/BeiDou) module for unwavering positional hold. The entire avionics suite is powered by a backup battery that activates automatically if the tether power is interrupted, enabling a safe, controlled landing.

　　2. The Tethered System: The Lifeline of Persistent Flight

　　The tether is the core innovation that enables the LH-120's exceptional endurance.

　　Micro-Tether Cable: Unlike standard cables, the LH-120's tether is a lightweight, fiber-optic micro-tether. This design minimizes weight and wind resistance, allowing the drone to fly higher and more stably. The fiber-optic core provides secure, low-latency, and high-bandwidth data transmission for video and communications, immune to radio frequency interference.

　　Conducting Wires for Power: Wrapped within the tether are ultra-thin copper conductors that deliver high-voltage power from the ground station to the drone. Using a higher voltage reduces current, which minimizes power loss over long distances and allows for a thinner, lighter cable.

　　Tether Reel and Deployment System: The ground station contains an automated reel with a slip-ring mechanism. This critical component allows for the continuous transmission of power and data while the tether is being wound or unwound, eliminating cable tangling. The deployment system ensures smooth and controlled tether management during ascent and descent.

　　3. The Ground Station: Power and Control Hub

　　The ground station is the operational heart of the system, providing a stable platform and uninterrupted power.

　　Power Supply Options: The system is highly adaptable. It can be powered by a standard AC grid connection, a dedicated generator, or a silent, emission-free battery pack for fully mobile operations.

　　Intelligent Power Management: The ground station houses a power converter that transforms the input power to the optimal high-voltage DC required by the drone. It includes comprehensive safety features such as overload protection, surge suppression, and real-time power monitoring.

　　Ground Control Station (GCS): Operators control the system via a ruggedized laptop or tablet running dedicated GCS software. The interface provides real-time telemetry, including altitude, power status, wind speed, and system health alerts. It also manages the payload and displays the live video feed.

　　Transportation and Handling Guidelines

　　Proper transportation is vital to protect the sophisticated components of the LH-120 system and ensure it arrives in perfect working condition.

　　Packaging and Pre-Transport Preparation

　　Customized Hard Cases: The LH-120 system is shipped in custom-foamed, ATA-300 certified hard cases. The aerial vehicle, ground station, tether reel, and accessories each have precisely cut foam slots, preventing any movement during transit.

　　Tether Cable Care: The tether cable must be carefully wound onto its dedicated reel before transport. Avoid sharp bends, kinks, or crushing. The reel should be securely fastened within its case.

　　Battery Disconnection and Safety: If the system includes a portable battery pack, ensure it is disconnected and charged to a storage level (typically 30-50%). Verify that all power sources are switched off before packing.

　　Documentation: Ensure the shipping box contains all necessary documentation, including packing lists and commercial invoices, to facilitate smooth customs clearance for international B2B shipments.

　　Handling and Storage Recommendations

　　Lifting and Moving: Always use the handles provided on the transport cases. Do not stack heavy items on top of the cases. The ground station, if heavy, should be moved using appropriate equipment.

　　Environmental Conditions: Store and transport the system in a cool, dry environment. Avoid prolonged exposure to direct sunlight, extreme heat (above 50°C / 122°F), or sub-zero temperatures, as this can damage electronics, batteries, and the tether cable.

　　Post-Transport Inspection: Upon receipt, carefully inspect the outer packaging for signs of severe impact. Open the cases and visually inspect all components for any physical damage. Before the first flight, perform a full system check as outlined in the user manual.

　　Maintenance Requirements for Optimal Performance

　　Proactive and scheduled maintenance is the key to ensuring the long-term reliability and safety of the LH-120 system.

　　Daily/Pre-Flight Maintenance Checklist

　　Airframe Inspection: Visually inspect the entire drone structure for cracks, stress fractures, or loose components. Pay special attention to the motor arms and propeller mounts.

　　Propeller Check: Examine all propellers for nicks, cracks, or imbalances. Ensure they are securely fastened. Damaged propellers must be replaced immediately.

　　Tether Cable Inspection: Carefully run the tether through your fingers, checking for any cuts, abrasions, exposed wires, or damaged strengthening fibers. Even minor damage can compromise performance and safety.

　　Connector Integrity: Check all electrical and fiber-optic connectors on the drone and ground station for dirt, damage, or bent pins. Ensure they are clean and firmly connected.

　　System Functional Test: Power on the system and perform a short-duration hover test at a low altitude to verify all systems—flight control, power transmission, data link, and payload—are functioning correctly.

　　Scheduled and Periodic Maintenance

　　Every 100 Flight Hours:

　　Perform a detailed inspection of all motor bearings for wear or grit.

　　Check the tightness of all critical fasteners and screws on the airframe and ground station, applying a thread-locking compound if specified.

　　Clean electrical contacts with isopropyl alcohol and compressed air.

　　Every 500 Flight Hours or 12 Months (Annual Service):

　　This is a major service interval. We strongly recommend returning the entire LH-120 system to an authorized service center.

　　Service includes a full vibration analysis, motor balancing, deep calibration of all sensors, and a thorough inspection of the internal electronics of both the drone and the ground station.

　　The tether cable should undergo a full electrical and optical performance test to check for internal degradation.

　　Long-Term Storage Protocol

　　For storage exceeding one month:

　　Thoroughly clean all components and ensure they are completely dry.

　　Store the system in its original cases.

　　If equipped, store the battery pack at a proper storage charge in a fire-proof container.

　　Store in a climate-controlled environment with stable temperature and low humidity.

　　Application Solutions: Deploying Persistent Aerial Capability

　　The LH-120's ability to provide a stable, long-endurance aerial platform makes it a transformative tool across numerous industries.

　　1. Critical Infrastructure Security and Monitoring

　　Solution: Deploy the LH-120 as a permanent or rapid-deployment sentry for power substations, oil and gas pipelines, ports, and airports.

　　Benefit: Provides a persistent, elevated vantage point for continuous surveillance, replacing or supplementing fixed cameras and ground patrols. Its thermal imaging payload can detect intrusions day and night, while its presence acts as a powerful deterrent.

　　2. Public Safety and Emergency Response

　　Solution: Use the LH-120 for situational awareness during large public events, protests, firefighting operations, and search-and-rescue missions.

　　Benefit: Offers command centers a stable, real-time video overview of the entire incident area for hours on end. The secure fiber-optic data link ensures that sensitive video feeds cannot be intercepted or jammed. The system can also serve as a temporary communications relay.

　　3. Broadcasting and Live Event Coverage

　　Solution: Utilize the LH-120 as an "aerial camera crane" for broadcasting sporting events, concerts, and festivals.

　　Benefit: Provides a completely stable shot from a unique, fixed aerial perspective for extended durations, eliminating the need for costly helicopter rentals and the limitations of battery-powered drones. The high-bandwidth fiber tether enables the transmission of broadcast-quality video.

　　4. Military and Border Patrol Operations

　　Solution: Establish a persistent intelligence, surveillance, and reconnaissance (ISR) post for temporary forward operating bases or border surveillance.

　　Benefit: Delivers uninterrupted aerial monitoring of a designated area, enhancing force protection and perimeter security. The system's resilience to jamming and its ability to operate for days make it a force multiplier for defense and homeland security applications.

　　Conclusion: The Unmanned Aerial Sentinel

　　The LH-120 Tethered Drone System is more than just a product; it is a robust, reliable, and versatile aerial solution engineered for the most demanding operational requirements. Its thoughtful structural design, coupled with clear guidelines for transport and maintenance, ensures maximum operational readiness and a long service life. By understanding its capabilities and integrating it into your security or operational protocol, you gain an unwavering eye in the sky that dramatically enhances safety, efficiency, and situational awareness. Contact our team today to discuss how the LH-120 can be tailored to your specific B2B needs.