3W-International Heavy-Fuel and Gas Engines for Unmanned Aircraft

3W International

3W-International manufactures next-generation heavy-fuel (HF) and gas engines for the unmanned aerial vehicle (UAV) industry.

The company’s engines are designed for unmanned fixed wings, helicopters and hybrid unmanned aerial vehicles (UAV).

Custom-made UAV propulsion systems for maximum power

3W-International engines can be supplied with a carburettor or an electronic injection, and can be customised based on the used aircraft and fuel types, or the necessary performance parameters.

3W-International’s complete propulsion systems consist of unpack, install and take off, and the engines can be provided with all auxiliary systems.

Wankel rotary hybrid cycle engines for field operation payloads

3W-International’s Wankel Rotary UAV Engine is a compact hybrid cycle engine, which is lightweight and provides a high power-to-weight ratio, increasing field operation payloads.

An additional 15KW depend on store capacity with the hybrid boost power, which simplifies lift-off or acceleration. The 3W-180 SRE can run on gas or HF, and is offered with a standard manifold or high-pressure injection (HPI). Engine cooling is guaranteed by water cooling of the housing and oil cooling of the rotor (active cooling).

Single and multiple cylinder engine ignitions

3W-International supplies one-cylinder, two-cylinder and four-cylinder engines. All two-stroke engines measure 55cm and are delivered as a twin-spark (TS) version, which increases safety and reliability.

Both ignitions operate separately and general operational behaviour is quieter as the engine runs at a lower idle. When one ignition stops, the second ensures that the engine continues to run with slightly reduced rotational speed.

Long-term tests for aircraft durability verification

3W-International offers an extensive variety of long-term tests that are adapted and performed individually according to client requests using state-of-the-art measuring instruments.

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

Muffler systems for aircraft engine development

3W-International mufflers use turbine wheels that are permanently installed in a cylinder. The individual fins mounted on the wheels are organised / configured in defined angles and arranged in opposite directions, depending on the angle, which smoothes out the exhaust gas’ sound wave.

Time-between-overhauling (TBO) for extreme engine propulsion

3W-International specifies TBOs between 400-600 hours, according to engine maintenance and the conditions of use.

The total number of hours will depend on the revolutions per minute (RPM) range and applications. It is possible to achieve maximum performance 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

3W-International’s Managing Director Karsten Schudt Comments on Company Developments

Managing director of 3W-International, Karsten Schudt, discusses the company's developments and changes that followed its turbulent period, resulting in success at 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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Products and Services


Press Release

6 June 2018

Managing director of 3W-International, Karsten Schudt, discusses the company's developments and changes that followed its turbulent period, resulting in success at Xponential 2018.

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1 May 2018

Sky Power GmbH has revealed its engine and product concept ahead of Xponential 2018.

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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 last week. For this reason, 3W-International managing director Karsten Schudt has released a statement that the leading engine supplier for UAS's remains unaffected in spite of this development.

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20 April 2018

3W-International is expanding its own direct sales structure in this important target market to further extend its market presence in North America. 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

Sky Power will introduce 3W-International's first advanced engine to the public at Xponential 2018 in Denver. It involves a 110ccm, two-stroke power plant that has been supplied 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, Sky Power, is introducing a novel engine construction kit at Xponential 2018 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 for use with all 3W petrol and heavy-fuel (HF) engines.

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4 April 2018

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

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26 March 2018

Increasing demand for two-stroke engines has prompted 3W-International to expand its sales structure and 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

Preparations are already in progress for the second Unmanned Technologies and Security (U.T.SEC) Expo and Conference, following its highly promising launch in early March 2017.

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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 later, CEO Karsten Schudt draws a positive balance relative to the new engine.

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31 August 2017

Muffler systems are gradually becoming the focus of engine development with the advancing development of unmanned aerial vehicles (UAVs). As a result of this, 3W-International began developing a series of in-house mufflers.

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31 July 2017

In 2016, 3W-International joined forces with Raumfahrt Baden-Württemberg and Forum Luft.

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2 July 2017

In 2016, 3W-International saw an increase in the interest of heavy-fuel (HF) and gasoline combustion engines, especially so for their use in unmanned helicopters.

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1 June 2017

German engine manufacturer 3W-International has provided a new customer services solution for both new and existing, as well as third-party customers.

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26 May 2017

German engine manufacturer 3W-International is expanding its range of drive products for unmanned aerial vehicles (UAVs) by a further engine sector, the 3W-180 SRE Wankel.

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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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