Heavy Fuel, Gasoline Engines & Wankel Rotary UAV Engines

3W International is a leading developer of heavy fuel and gasoline engines for Unmanned Aerial Vehicles (UAVs). With more than 30 years of experience in developing, manufacturing and testing engines, we provide fully tested high-reliability propulsion solutions with reduced fuel consumption and noise levels to UAV manufacturers worldwide.

Heavy Fuel Engines (HFE) for UAVs

Two-Stroke Multi-Fuel Engines for Fixed Wing and VTOL Drones

Our Heavy Fuel engines are available in one-, two- or four-cylinder models and have been tested under the harshest of conditions to ensure the highest performance and reliability. We can also provide our patented engine mufflers to further reduce noise levels.

Engines with a cylinder capacity of 20.68 cubic inches and higher are fitted with manually operated compression release valves as standard, with automatically operated valves available upon request. Engines with a cylinder capacity of 3.30 cubic inches are fitted with automatically operated valves as standard, reducing the load on the crankshaft if an external electrical starter is used, and allowing the engine to be stopped and restarted while the UAV is in the air.

All engines with a capacity of 55 cc or higher can be delivered as a twin-spark version, with independently operating ignitions.  This provides quieter running, increased safety and reliability and redundant operation.

1-Cylinder UAV Engines:

2-Cylinder UAV Engines:

4-Cylinder UAV Engines:

Find out more: Heavy Fuel UAV Engines (HFE)

Gas Engines for UAVs

Two-Stroke Gasoline Engines for Fixed Wing and VTOL Drones

Our gasoline engines are also available in one-, two- or four-cylinder models. All engines can be fitted with a carburettor, or with an electronic fuel injection system that increases power, reduces fuel consumption and allows better control and regulation of the engine. As with our heavy fuel engines, all gasoline engines with a capacity of 55 cc or higher can be delivered as a twin-spark version, with independently operating ignitions.

All gasoline engines can also be upgraded to Competition series, optimized for enhanced performance with modified transfer ports and individually adjusted compression for each cylinder. Competition series engines benefit from increased power and torque, as well as improved throttle response at lower RPM ranges, and are painted with two coats of highly temperature-resistant metallic orange 2K engine paint.

1-Cylinder UAV Engines:

2-Cylinder UAV Engines:

4-Cylinder UAV Engines:

Find out more: Gas Engines for UAVs

Wankel Rotary UAV Engine

3W-180 SRE 4-Stroke Hybrid Engine

Our new 3W-180 SRE Wankel Rotary UAV Engine is a Wankel hybrid cycle engine with a compact design. This lightweight 4-stroke rotary engine features an outstanding power-to-weight ratio, allowing UAVs to carry greater payloads.

The hybrid boost power provides the engine with an additional 15KW (depending on storage capacity), giving greater lift-off or acceleration capabilities to unmanned aircraft. The 3W-180 SRE can be run on gasoline or heavy fuel, with the option for standard manifold or high pressure injection (HPI). The engine housing is water-cooled and the rotor is actively cooled by oil.

Specifications:

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Complete UAV Propulsion Units

Customized UAV Propulsion Systems

We can tailor our standard engine designs to your exact specifications, including unmanned aircraft type, fuel type and performance parameters, to create a complete custom propulsion system. We can also provide all auxiliary subsystems, down to the propellers.

Our wide range of experience and technical knowledge, coupled with high-quality components, will provide you with a finished solution precisely tailored to your demands.

Find out more: Complete UAV Propulsion Units

3W Engineering Services

Design, Development, Manufacturing and Testing of UAV Propulsion Systems

We offer a comprehensive suite of engineering services to help our clients develop new propulsion systems, optimize existing designs, and integrate propulsion units into the chassis of their UAVs.

Our areas of expertise in the design of propulsion systems and subsystems include:

With our state-of-the-art in-house test benches, we have the capabilities to thoroughly test both our own designs as well as third-party designs. Our test equipment is also available for rent. Tests include:

Our wide range of experience and technical knowledge, coupled with high-quality components, will provide you with a finished solution precisely tailored to your demands.

Find out more: 3W Engineering Services