Lightweight 20 kW UAV engine with integrated start-motor, horizontal-opposed low-vibration design, electronic injection, auto-braking safety shutdown, and optional high-thrust carbon fiber propeller—ideal for 100–200 kg fixed-wing, composite-wing, and loitering UAVs.

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UAV Engine ModelsQS27A 20KWQS27B 20KWQS55A 40KWQS55B 40KW

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📘 PRODUCT DESCRIPTION

The QS27B Start-Motor 20 kW Engine is a compact, high-efficiency propulsion solution engineered for tactical UAV platforms requiring stable output, rapid start response, and low-vibration performance.
Designed with a horizontal-opposed cylinder layout, the engine maintains exceptional stability in flight, improving ISR payload clarity and overall structural endurance.

Powered by 92# gasoline and above, the engine uses a 50:1 fuel–oil lubrication ratio and an advanced electronic injection (INJECTION) system to ensure optimal combustion efficiency.
Its full speed range of 1500–6500 RPM provides broad mission flexibility, from low-noise cruise to high-power climb segments.
With a minimal fuel consumption rating of <350 g/kWh, the system supports long-endurance operations typical of ISR, patrol, or loitering platforms.

A fully integrated motor-start mechanism delivers instant, reliable engine ignition, while the auto-brake shutdown function halts propeller rotation immediately after engine stop, enhancing landing and ground-crew safety.

Weighing less than 11.6 kg, the Start-Motor version improves payload allocation and simplifies installation.
Its quick-detach integrated structure enables fast field servicing during intensive mission cycles.

Key Advantages

• Integrated Start-Motor Architecture

Fast, reliable ignition; reduced wiring; simplified UAV integration; ideal for rapid deployment missions.

• Horizontal-Opposed Low-Vibration Engine

High stability for electro-optical sensors, communication systems, and long-endurance flight performance.

• Lightweight & Compact (<11.6 kg)

Optimized power-to-weight ratio for 100–200 kg tactical UAV airframes.

• Intelligent Injection System

Precise electronic fuel delivery ensures consistent performance across the full RPM band.

• Auto-Braking Safety Shutdown

Stops propeller rotation immediately after engine cutoff for safer landing and maintenance.

• Optional Carbon Fiber Propeller

• Static thrust: >45 kgf

• Dynamic thrust: >28 kgf @ 50 m/s

• Adds only +0.6 kg
  Ideal for high-thrust, heavy-payload, or high-altitude environments.

Technical Specifications

Application Scenarios

• Fixed-Wing UAVs

Designed for long-endurance ISR, mapping, coastal patrol, and medium-altitude missions.

• Composite-Wing / Transition UAVs

Stable, efficient propulsion for hybrid aerodynamic platforms.

• Loitering Munition Systems

Low-vibration design enhances guidance stability and terminal accuracy.

• 100–200 kg UAV Platforms

Optimized power-to-weight ratio for tactical and industrial UAV applications.