ADX 390

Elevate Your UAV Performance with the ADX 390 from U.S. UAV Engines

Push the boundaries of UAV performance with the ADX 390—a 390cc, four-cylinder boxer engine that delivers outstanding power in an impressively lightweight design. Evolved from the reliable ADX 195 twin, the ADX 390 offers increased output while maintaining exceptional agility and efficiency in flight.

Lightweight Power, Built for Demanding Missions

Ultra-Light Construction: Maximize power-to-weight ratio for extended flight times and greater payload capacity.
High-Performance Output: Designed to meet the demands of heavy-lift and high-speed operations with ease.

Precision Engineering for Unmatched Dependability

CNC-Machined Crankcase: Enjoy a stronger, more stable build with reduced vibration for smoother operation.
Boxer Four-Cylinder Design: Balanced power delivery ensures consistent, reliable performance on every mission.

Tailored for Your UAV Requirements

Dual Spark Option: Improve safety and redundancy with twin ignition systems.
Custom Crankcase & Cylinder Heads: Configure the engine to support advanced cooling, increased performance, or specific mission profiles.
Sensor Integration Ready: Built-in options for adding mission-critical sensors to enhance data collection and system optimization.

Uncompromised Performance, Minimal Weight

The ADX 390 offers the perfect balance of power and lightweight efficiency—giving your UAV the edge it needs. Discover how U.S. UAV Engines can help elevate your platform’s capabilities. Contact us today to learn more about the ADX 390.

Technical data

Displacement: 390 ccm
Weight: ADX 390 8200grams/ with starter 9740grams/ with starter and generator 101/6/8 -10000grams including ignition) with starter and generator 101/14/20 10600grams including ignitions) Weight of the exhaust system shown in the gallery is 850grams
Bore: 52mm
Stroke: 38mm
RPM range: 1000-8500 ot/min
Max launching acceleration load: 20G
Ignition: processor controlled two separate units
Spark plugs: NGK CM-6 optionally Denso U20M-U
Spark plug electrodes gap: 0,5-0,7mm
Intake system: Reed valves
Recommended oil: Full synthetic oil for two stroke air cooled engines
Recommended fuel: Automotive gas BA 95 or higher
Fuel mixture oil-gas: 1:30(break-in) 1:40 (normal run)
Carburetor: Walbro WB-27
Normal/Max CHT: 160/200 degrees of Celsius
Fuel consumption: 3,8l/hr. @ 3500 RPM 40×16 twin blade propeller
Propeller configuration: Tractor or Pusher
MTBF: 280hrs

Options

Rotation Options: Our engines are available with customizable rotation—choose between clockwise (CW) or counterclockwise (CCW) configurations. This flexibility allows seamless adaptation to your propulsion system layout and aerodynamic requirements.
Exhaust System: We offer two primary exhaust configurations. Standard SSA Compact or Direct Mount System. Additionally, we can engineer custom exhaust solutions to meet your specific spatial or thermal management needs.
Double Spark Plug Heads: For enhanced safety and redundancy, our engines can be equipped with double spark plug heads. This ensures continued engine operation even in the event of a spark plug failure—ideal for mission-critical UAV operations.
Additional Sensor Mounting Positions: We provide optional sensor mounting positions on the cylinder heads or crankcase, offering flexibility to integrate additional telemetry or monitoring systems tailored to your application.
Cylinder Head Redesign: Our team can completely redesign cylinder heads to improve cooling efficiency or to ensure the engine fits within your custom cowl space—perfect for specialized airframe integration.
Electric Starter: Optional electric starters enable quick and effortless engine start-ups, saving time and minimizing ground operation complexity.
Automatic Deco Valves: For improved airborne restart capabilities, engines can be fitted with automatic decompression (deco) valves, making mid-air restarts more reliable and user-friendly.
Integrated Power Generator: We offer engines with integrated brushless power generators, ensuring high-efficiency power output to support onboard electronics, payloads, and other mission systems.
Custom-Made Backplates: We can design custom backplates that provide optimized mounting solutions and are tailored to fit the structural requirements of your UAV platform.
Electronic Fuel Injection (EFI): Upgrade to electronic fuel injection for superior fuel efficiency, performance consistency, and altitude adaptability, ensuring top-tier engine behavior across varying environmental conditions.