40.1 kW integrated start-motor-generator UAV engine with electronic injection, low-vibration opposed-cylinder design, 2 kW onboard power generation, optional high-thrust carbon propeller, and quick-detach modular architecture—engineered for medium-class fixed-wing, composite-wing, and target UAVs.

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UAV Engine ModelsQS27A 20KWQS27B 20KWQS55A 40KWQS55B 40KW

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📘 PRODUCT DESCRIPTION

The QS55A Integrated Start-Motor-Generator Engine is UAVPOWER’s high-performance propulsion system designed for medium-class tactical UAVs requiring substantial power output, onboard electrical generation, and exceptional flight stability.
With 54.5 hp (40.1 kW) rated power and advanced electronic injection, the QS55A ensures efficient combustion, reliable ignition, and strong acceleration throughout its 1500–6500 RPM operational band.

Its horizontal-opposed cylinder architecture significantly reduces vibration, improving ISR payload clarity, avionics stability, and flight endurance under high dynamic loads.
The integrated start-motor-generator provides rapid engine startup and delivers 2 kW @ 28 V continuous power for onboard electronics, datalinks, and payload systems—ideal for mission-intensive UAV operations.

Engineered with a quick-disassembly integrated structure, the QS55A supports fast field maintenance and minimizes downtime during continuous mission cycles.
Its auto-brake shutdown feature engages immediately after engine cutoff, preventing propeller rotation and maximizing landing and ground safety.

Weighing under 22.5 kg, the QS55A achieves an optimal power-to-weight ratio for 150–300 kg UAV platforms requiring long endurance, high climb rates, or heavy payload capacity.

An optional high-thrust carbon fiber propeller delivers >89 kgf static thrust and >60 kgf dynamic thrust @ 50 m/s, adding only +1.0 kg, making it ideal for high-altitude and high-load mission profiles.

⭐ Key Advantages

• Integrated Start-Motor-Generator System

Provides instant startup, stable 28V electrical power, reduced wiring complexity, and simplified aircraft integration.

• High Power Output (40.1 kW / 54.5 hp)

Delivers strong thrust for takeoff, climb, and high-demand mission phases in medium-size UAVs.

• Horizontal-Opposed Low-Vibration Engine Architecture

Ensures exceptional flight stability and protects sensitive payloads such as EO/IR sensors and telemetry modules.

• Intelligent Electronic Injection System

Optimal fuel-air management reduces fuel consumption and enhances mid–high RPM performance.

• Quick-Detach Modular Design

Enables rapid maintenance and efficient turnaround during frequent mission cycles.

• Auto-Braking Safety Shutdown

Stops propeller rotation immediately after engine cutoff, increasing landing and personnel safety.

• Optional High-Thrust Carbon Fiber Propeller

• Static thrust: >89 kgf

• Dynamic thrust: >60 kgf @ 50 m/s

• Adds only +1.0 kg
  Perfect for heavy-load UAVs and target drones requiring rapid acceleration.

📊 Technical Specifications

✈️ Application Scenarios

• Fixed-Wing UAVs

Long-range ISR, high-endurance patrol, maritime surveillance, and heavy-payload missions.

• Composite-Wing UAVs

Hybrid aerodynamic platforms requiring stable, high-output propulsion.

• Target Drones

High-speed maneuvering, sustained acceleration, and rapid response mission profiles.

• 150–300 kg UAV Platforms

Ideal powertrain for tactical, industrial, and training UAV systems.