3W-International Gas and Heavy-Fuel Engines for Unmanned Aerial Systems and Vehicles

3W International

3W-International, manufacturer of two-stroke gas engines, develops and patents next-generation heavy-fuel (HF) engines for unmanned aerial systems (UAS). All HF-engines can run with JET A-I, JP-5, JP-8, mix ration 2% Aspen Oil 0.1% Diesel Valve Cleaner.

3W-International engines are used in unmanned fixed wings, helicopters and hybrid unmanned aerial vehicles (UAV). HF-Wankel engines and the sub-systems, are also part of the product line.

Single and multiple cylinder engines for UAS

3W-International offers one-cylinder, two-cylinder and four-cylinder engines.

All two-stroke engines measure 55cm and are delivered as a twin-spark (TS) version. The safety and reliability increase in both single-cylinder and multiple-cylinder engines when using the TS cylinder.

Both ignitions work independently and the engine runs at a quieter yet lower idle. When one ignition fails, the second ensures that the engine continues to run with slightly reduced rotational speed.

Rotary UAV engine for field operations

3W-International’s Wankel Rotary UAV engine is a hybrid cycle engine with a compact design.

The lightweight, four-stroke rotary engine (SRE) offers a high power-to-weight ratio, allowing an increased payload in field operations. With the hybrid boost power, an additional 15KW depend on store capacity, which simplifies lift-off or acceleration.

The 3W-180 SRE can run with gas or HF. Therefore, 3W-International offers a standard manifold or a high-pressure injection (HPI).

The cooling of the engine is guaranteed by water cooling of the housing and oil cooling of the rotor (active cooling).

Customised military engines for high-powered applications

All standard engines by 3W-International can be tailored according to customer specifications based on the used aircraft type, the required performance parameters or the fuel types.

They can be available with all auxiliary systems up to propellers and 3W-International’s complete propulsion systems consist of unpack, install and take off.

Long-term tests to verify vehicle durability

3W-International offers a wide variety of long-term tests, which are adapted and performed individually according to client requests using sophisticated measuring instruments.

A wide variety of long-term tests are required, from the 50-hour test for microlight aircraft to tests of up to 200 hours.

Muffler systems for engine development

3W-International mufflers use a variant of turbine wheels that are installed permanently in a cylinder.

The individual fins mounted on the wheels are queued up in defined angles, where they are arranged in opposed directions depending on the angle. This arrangement smooths the exhaust gas’ sound wave.

Time-between-overhauling (TBO) for ultimate engine performance

3W-International specifies TBOs of up to 400-600 hours, depending on the operational conditions and the maintenance of the engine. The number of hours will depend on the areas of use and the revolutions per minute (RPM) range. Maximum performances are possible if engines are driven at moderate speeds and serviced at regular intervals.

About 3W-International

3W-International GmbH is a leading developer of heavy fuel and petrol engines for Unmanned Aerial Vehicles (UAVs).

With 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.

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Press Release

Interview with 3W-International’s Karsten Schudt

In the past few weeks, 3W-International GmbH has gone through some turbulent times that brought about many new developments and changes, resulting in a very successful Xponential 2018.

White Papers

Multi-Fuel Engine Product Portfolio

In 2007, 3W International began to research and develop its first heavy fuel engines. Several developments were made and tested until the R&D department decided on the final engine design.

3W International GmbH

Hollerstraße 12

61350 Bad Homburg vor der Höhe


+49 6172 80 89 34 0 www.3w-international.com

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Press Release

6 June 2018

In the past few weeks, 3W-International GmbH has gone through some turbulent times that brought about many new developments and changes, resulting in a very successful Xponential 2018.

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1 May 2018

3W-International's performance partner, Sky Power GmbH, unveiled its engine and product concept prior to this year's Xponential, the leading trade fair based in Denver, US.

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30 April 2018

A-techsyn - manufacturer of VTOLs, fixed-wing UAS's, target-acquisition drones, and communications and autopilot systems - will introduce the first VTOL equipped with one of 3W-International's performance partner Sky Power's engines at Xponential 2018 as part of the 3W-International exhibition stand. A SP-110 FI TS based on 3W-International's 110ccm model is involved here. The engine can be deployed both as vertical drive and for power generation.

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23 April 2018

The executive management of 3W-Modellmotoren, which acted as production service provider for 3W-International, filed for bankruptcy during the past week. For this reason, Karsten Schudt, managing director of 3W-International, is making a statement that the leading engine supplier for UAS's is covered concerning this development.

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20 April 2018

To further expand its market presence in North America, 3W-International is expanding its own direct sales structure in this important target market. With Constantin Diehl, a representative has been acquired who will actively represent the German engine manufacturer in the US, Canada, and Mexico.

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16 April 2018

3W-International's performance partner, Sky Power, will introduce the first advanced engine to the professional public at Xponential 2018 in Denver. It involves a 110ccm, 2-stroke power plant that has been provided with a new injection and ignition. The basic engine originates from the firm of 3W-International.

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11 April 2018

3W-International's performance partner is introducing a new engine construction kit to enable more efficient and performance-optimised engines.

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9 April 2018

3W-International's performance partner Sky Power has also brought a new injection and ignition system to market, which can be used for all 3W petrol and heavy-fuel (HF) engines. The new systems are obtainable immediately. The conversion of engines already in use is also being offered. The objective was to massively reduce the engines' consumption.

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4 April 2018

3W-International authorised Sky Power for further development and performance enhancement of 3W engines. Along this line, the first new additional products and new performance engines will be presented even before Xponential 2018 in Denver, Colorado.

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26 March 2018

Increasing demand for two-stroke engines has prompted Hessian company 3W-International to expand its sales structure. But it's not just about the expansion of pure sales structures; it's also about expanding project management capacities.

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7 February 2018

The second edition of Unmanned Technologies & Security Expo & Conference (U.T.SEC) will take place on 7-8 March at the Exhibition Centre Nuremberg, in parallel with Enforce Tac, the special exhibition for police equipment.

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11 January 2018

Following its highly promising launch in early March 2017, preparations are already in full swing for the second Unmanned Technologies and Security (U.T.SEC) Expo and Conference.

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3 January 2018

3W-International unveiled its new 3W-180 SRE hybrid Wankel engine at last year's Xponential. Six months on, CEO Karsten Schudt draws a positive balance relative to the new engine.

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31 August 2017

With the advancing development of unmanned aerial vehicles (UAVs), muffler systems are moving increasingly into the focus of engine development. It doesn't matter here whether they are being used to increase performance or purely for sound-volume minimisation. 3W-International recognised this development early on and began developing a series of in-house mufflers.

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31 July 2017

3W-International joined Forum Luft and Raumfahrt Baden-Württemberg in late 2016. The Baden-Württemberg aeronautical network represents the interests of the aviation industry in South West Germany, serving as a network hub between business, science, politics, and society. Enhancing the global competitiveness of resident companies is the focus of the networking.

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2 July 2017

German engine manufacturer 3W-International saw increased demand for heavy fuel (HF) and gasoline combustion engines in 2016. Interest is increasing especially strongly for their use in unmanned helicopters. The reasons for this are manifold.

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1 June 2017

The new customer service of the German engine manufacturer is called 3W Engineering Services. This will not only be offered to existing and new 3W customers, but also to third-party customers and includes various service, test and measurement activities relating to engines and drive units and their further development.

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26 May 2017

The world first will be presented for the first time to the specialist audience at the XPONENTIAL Trade Fair taking place in Dallas, Texas, in May. Therefore, the German engine manufacturer is expanding its range of drive products for unmanned aerial vehicles (UAVs) by a further engine sector.

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Regional Offices

3W International GmbH

Hollerstraße 12

61350 Bad Homburg vor der Höhe


+49 6172 80 89 34 0 www.3w-international.com

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