Model: LH90

　　Wheelbase: 2300mm

　　Payload capacity: 20-30KG

　　Tethered hovering height: 100-300 meters

　　Wind resistance: Wind force 7

　　Hanging time: ≥ 12 hours

　　Onboard power supply power: 16-24KW

　　Municipal power/generator: AC380V

　　Application scenarios: Wall cleaning, communication relay, electro-optical reconnaissance, environmental detection, 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.

　　The LH90 Tethered Drone system is engineered for mission-critical, persistent aerial operations, providing a stable and continuous platform for communications, surveillance, and security. To ensure this advanced system delivers maximum operational uptime and a long service life, a thorough understanding of its maintenance, material construction, and after-sales support is essential. This comprehensive guide details the protocols and features that make the LH90 a reliable long-term investment for B2B clients.

　　Maintenance Requirements: Ensuring Peak Performance

　　Proactive and scheduled maintenance is the cornerstone of the LH90's reliability. Adhering to these procedures will minimize downtime and ensure operational safety.

　　Daily / Pre-Flight Maintenance Checklist

　　A brief but thorough inspection must be conducted before each operation.

　　Visual Airframe Inspection: Check the entire drone structure, including arms and landing gear, for any signs of cracks, stress fractures, or loose components.

　　Propeller Check: Examine all propellers for nicks, cracks, or imbalances. Ensure they are securely fastened. Replace any damaged propellers immediately.

　　Tether Cable Inspection: Carefully run the tether through your fingers, checking for cuts, abrasions, kinks, or exposed wires. Pay close attention to the connection points at the drone and the ground station.

　　Connector Integrity: Verify that all electrical and data connectors are clean, undamaged, and firmly seated.

　　System Functional Test: Power on the system and perform a short-duration, low-altitude hover test to verify flight stability, power delivery, and data link integrity.

　　Scheduled Periodic Maintenance

　　Structured maintenance intervals are crucial for long-term health.

　　Every 50 Flight Hours:

　　Perform a detailed inspection of motor bearings for smooth operation and signs of wear.

　　Check the tightness of all critical fasteners on the airframe and ground station, applying thread-locker if specified by the manual.

　　Clean electrical contacts with isopropyl alcohol and compressed air.

　　Every 300 Flight Hours or 12 Months (Annual Service):

　　This is a major service interval. We strongly recommend sending the entire LH90 system to an authorized service center.

　　Service includes a full vibration analysis, motor balancing, deep calibration of all sensors (IMU, GNSS), and a thorough inspection of the internal electronics.

　　The tether cable undergoes a full electrical and mechanical 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 drone, tether reel, and ground station in their original, dry, and temperature-controlled cases.

　　The tether should be neatly wound onto its reel without sharp bends.

　　If the system includes a portable battery pack, ensure it is charged to the recommended storage voltage (typically 3.8V per cell).

　　Comprehensive After-Sales Support Policy

　　Our partnership with you extends far beyond the point of sale. We provide a robust, multi-channel support ecosystem to ensure your operational continuity.

　　Professional Technical Support Channels

　　Dedicated Support Portal: This is the primary channel for support. Registered clients gain access to a knowledge base, software downloads, and a ticketing system to track the status of requests.

　　Email Support: For detailed technical inquiries and documentation requests, with a target response time of one business day.

　　Scheduled Video Calls: For complex operational challenges, we can arrange one-on-one video sessions with our senior engineers for real-time, visual diagnostics.

　　Warranty and Repair Services

　　The LH90 system is backed by a clear and comprehensive warranty.

　　Standard Warranty Coverage: The core system, including the aerial vehicle and ground station electronics, is covered by a 12-month limited warranty from the date of delivery against defects in materials and workmanship.

　　Warranty Service Process: To initiate a claim, contact support to receive a Return Material Authorization (RMA) number. All returned units must be shipped with this RMA number clearly marked. Our technicians will diagnose the issue, provide a report, and execute the repair or replacement promptly.

　　Out-of-Warranty Services: We offer lifelong paid repair and maintenance services beyond the standard warranty period, ensuring the long-term sustainability of your LH90 fleet with transparent pricing.

　　Spare Parts and Component Replacement

　　We maintain a global inventory of genuine LH90 spare parts and accessories. Using non-genuine parts will void the product warranty and may compromise safety. Available items include:

　　Propulsion System: Replacement propellers, brushless motors.

　　Power System: Tether reel assemblies, Power modules.

　　Structural Parts: Replacement arms, landing gear.

　　Expedited Shipping: For critical component failures, we offer expedited shipping options to minimize operational downtime.

　　Maintenance and Care Guide: A Closer Look

　　Beyond the schedule, understanding the "why" behind maintenance actions enhances care.

　　Tether System Care

　　The tether is the system's lifeline and requires particular attention.

　　Proper Winding: Always use the automated reel. Manual winding can introduce twists and kinks that weaken the cable.

　　Abrasion Prevention: Ensure the tether does not rub against sharp edges during deployment or flight. Use cable guides as instructed.

　　Environmental Exposure: While rugged, the tether should be inspected more frequently if used in abrasive environments (e.g., sandy or dusty conditions).

　　Battery Care for Mobile Operations

　　Charging: Always use the provided or approved smart charger. Never leave batteries charging unattended. Charge in a well-ventilated, fire-proof area.

　　Lifespan Monitoring: The Ground Control Station software provides battery health data. Retire batteries that show significant swelling, voltage sag, or high internal resistance.

　　Software and Firmware Updates

　　Regular Updates: Keep the flight controller and ground station software up to date. Updates often include performance improvements, new features, and critical safety patches.

　　Pre-Update Checklist: Always back up your configurations and perform updates in a stable environment, not immediately before a critical mission.

　　Material and Construction Specifications

　　The durability of the LH90 is a direct result of its advanced material selection and precision engineering.

　　Aerial Vehicle Materials

　　Airframe: The primary structure is manufactured from carbon fiber composite and aerospace-grade aluminum alloy.

　　Carbon Fiber: Used for the arms and central plate, providing an exceptional strength-to-weight ratio and rigidity, which is crucial for stable flight and vibration damping.

　　Aerospace Aluminum: Used for high-stress load-bearing points, such as motor mounts and landing gear hinges, offering superior durability and impact resistance.

　　Propulsion System:

　　Motors: Custom-wound, high-torque brushless motors designed for continuous operation, not peak bursts. They are sealed to protect against dust and moisture.

　　Propellers: Made from reinforced glass-fiber reinforced nylon, offering a balance of stiffness, lightness, and impact resistance.

　　Tethered System Materials

　　Tether Cable: This is a custom-engineered micro-tether.

　　Conductors: Ultra-fine, high-purity copper wires for efficient power transmission.

　　Data Core: A single-mode optical fiber for secure, high-bandwidth, low-latency data transmission, immune to electromagnetic interference.

　　Strength Member: A woven aramid fiber (e.g., Kevlar®) core that provides the cable's tensile strength, allowing it to withstand high tension without stretching or breaking.

　　Jacket: A polyurethane or other advanced polymer blend outer jacket that offers excellent abrasion, UV, and chemical resistance.

　　Reel and Slip-Ring Assembly:

　　The reel is constructed from reinforced polymer.

　　The slip-ring, critical for continuous power and data transfer, uses precious metal contacts for low electrical resistance and long service life, housed in a sealed unit to prevent contaminant ingress.

　　Ground Station Materials

　　The enclosure is made from die-cast aluminum for superior electromagnetic shielding and heat dissipation, protecting the sensitive internal power conversion and control electronics.

　　Conclusion: A Partnership in Persistent Flight

　　The LH90 Tethered Drone System is a sophisticated investment in persistent aerial capability. Its robust material construction, when paired with a disciplined maintenance regimen and supported by a responsive, professional after-sales network, guarantees a platform you can depend on for the long haul. By understanding its construction and adhering to the outlined care and support procedures, you ensure that the LH90 will continue to be a vital asset for your security, surveillance, or communication missions, day after day, year after year.