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AERO Hydrogen & Battery Summit: Bosch Aviation Technology presents concept for ground-breaking hydrogen aircraft engine

Innovation project paves the way for climate-friendly propulsion of light aircraft

  • System and hydrogen expertise from Bosch Aviation Technology enables the development of climate-friendly propulsion systems based on proven engine designs
  • High power output and reliability thanks to special Bosch components for hydrogen operation
  • Hydrogen from renewable energy sources makes the engine climate-friendly and almost particle-free
Cornelia Dürr

Cornelia Dürr

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Vienna – In the face of increasing social environmental awareness and targeted political initiatives such as the European Green Deal, interest in climate-friendly propulsion solutions for aviation is growing. To demonstrate the great potential offered by hydrogen in aircraft propulsion, Bosch Aviation Technology, a subsidiary of Robert Bosch AG based in Vienna, has converted a conventional aircraft engine for operation with hydrogen as part of an innovation project. The basic unit, a four-cylinder gasoline engine, comes from the Austrian manufacturer BRP-Rotax, a leader in the development and production of powertrain systems for the leisure and powersports sector. "In implementing the feasibility study, we were able to draw upon the proven performance of the Rotax 916 aircraft engine and combine this with our many years of experience in the hydrogen sector. Instead of developing an entirely new engine, we opted to modify an established engine design as we anticipate strong demand for this pioneering approach in future customer projects due to the time, cost, and approval advantages," explains Christian Grim, General Manager of Bosch General Aviation Technology GmbH, which has been transferring products, services, and technologies from the automotive sector to the aviation industry for over 15 years.

Rapid conversion and high performance achieved on the test bench

As part of a feasibility study, the experts from Bosch successfully completed the necessary modifications for hydrogen operation on a 1.4-liter turbo engine in around four months. Thanks to their extensive development work on the engine test bench, they were able to significantly optimize the performance of the hydrogen engine. All components for the hydrogen system are based on volume-production developments from Bosch.

In its current project stage, the engine already delivers 115 kilowatts of maximum power and thus comes within around 2% of the basic gasoline engine. With a specific future development of a prototype, it will be possible to further increase the output.

As a result, the concept for future aircraft engines pursued by Bosch Aviation Technology could help to reduce carbon emissions in general aviation. The innovation project is thus in keeping with Bosch's strategic decision to intensify cross-segment developments of future drive and propulsion systems that will maximize the environmental compatibility and minimize the emissions of tomorrow's mobility.

Mobility is the largest Bosch Group business sector. According to preliminary figures, it generated sales of 55.9 billion euros in 2024, and thus contributed around 62 percent of total sales. This makes the Bosch Group one of the leading mobility suppliers. Bosch Mobility pursues a vision of mobility that is safe, sustainable, and exciting. For its customers, the outcome is integrated mobility solutions. The business sector’s main areas of activity are electrification, software and services, semiconductors and sensors, vehicle computers, advanced driver assistance systems, systems for vehicle dynamics control, repair-shop concepts, as well as technology and services for the automotive aftermarket. Bosch is synonymous with important automotive innovations, such as electronic engine management, the ESP anti-skid system, and common-rail diesel technology.

The Bosch General Aviation Technology GmbH is a 100% subsidiary of Robert Bosch AG Austria and was founded in 2008 with its headquarters in Vienna. The business unit offers products, technologies, and services for a variety of applications, with a special focus on general aviation. For over 15 years, Bosch Aviation Technology has successfully transferred proven automotive technology to the aviation sector.
Additional information is available online at https://www.bosch-aviation.com/

In Austria, the Bosch Group achieved a revenue of around 1.4 billion euros in 2023 with more than 3,200 employees. In 2024, the Bosch Group celebrated its 125th anniversary in Austria: On October 1, 1899, the company Dénes & Friedmann took over the representation of Bosch products for the entire Danube Monarchy. This marked the beginning of Bosch's activities in Austria and the start of a flourishing success story. Today, Bosch is represented in Austria with all four business sectors: Mobility, Industrial Technology, Consumer Goods, and Energy and Building Technology. International competence centers for the development of innovative and forward-looking mobility solutions are located in Vienna, Linz, and Hallein. Nearly half of the workforce in Austria is employed in the engineering sector. Committed technical talents find an inspiring work environment at Bosch in Austria to actively drive future topics forward. Dynamic employees in the production facilities in Hallein, Bischofshofen, Linz, and Pasching, as well as in sales and administrative areas, contribute to the sustainable success of the Bosch Group in Austria.
Additional information is available online at http://www.bosch.at, http://www.bosch-presse.at.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 417,900 associates worldwide (as of December 31, 2024). According to preliminary figures, the company generated sales of 90.5 billion euros in 2024. Its operations are divided into four business sectors: Mobility, Industrial Technology, Consumer Goods, and Energy and Building Technology. With its business activities, the company aims to use technology to help shape universal trends such as automation, electrification, digitalization, connectivity, and an orientation to sustainability. In this context, Bosch’s broad diversification across regions and industries strengthens its innovativeness and robustness. Bosch uses its proven expertise in sensor technology, software, and services to offer customers cross-domain solutions from a single source. It also applies its expertise in connectivity and artificial intelligence in order to develop and manufacture user-friendly, sustainable products. With technology that is “Invented for life,” Bosch wants to help improve quality of life and conserve natural resources. The Bosch Group comprises Robert Bosch GmbH and its roughly 470 subsidiary and regional companies in over 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. Bosch’s innovative strength is key to the company’s further development. At 136 locations across the globe, Bosch employs some 86,900 associates in research and development, of which nearly 48,000 are software engineers.

Additional information is available online at www.bosch.com, www.iot.bosch.com, www.bosch-press.com.

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