High-altitude research aircraft Grob G 520 “Egrett”
High-altitude research aircraft Grob G 520 "Egrett": After a week-long integration phase in Dension, Texas, where the Egrett is stationed, the aircraft, instruments, and team transferred to Minden, Nevada. There, the DLR and the AV Expert team met with the Perlan and Airbus teams, who had prepared the Blue Condor for the aircraft measurements. (© DLR)

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In December 2024, Airbus, the Perlan team, and DLR measured contrails from a hydrogen-powered turbojet engine in flight for the first time. This study represents an important step toward more climate-friendly aviation by investigating the factors influencing contrails on the climate.

Innovative approach to reducing climate impact

As part of the Blue project, a consortium consisting of , the Perlan team, and the German Center investigated the formation of contrails caused by combustion. This experimental , which took place in Minden, Nevada, marked a milestone by making the of a turbojet engine measurable in for the first time.

Comparison of hydrogen and kerosene-powered engines

Two modified Arcus gliders served as platforms for the comparison. One, equipped with an innovative engine, was developed by AeroDesignWorks. The other used a conventional kerosene engine. Both were launched by a Grob Egrett to an altitude of over nine kilometers to ensure realistic conditions for the formation of contrails.

Focus on microphysical properties

The aim of the measurement was to analyze the microphysical properties of contrails, particularly the number and size of ice crystals formed by hydrogen combustion. These properties play a crucial role in the of contrails. Contrail measurements were obtained in four of seven successful test .

Results and scientific evaluation

In addition to examining ice crystals, the study also focused on such as nitrogen oxides and aerosol particles. The data obtained, supplemented by ground-based engine test runs, are currently being evaluated and are expected to be published in a scientific publication in the near future to make the findings accessible to a wider public.

As a leading company, is committed to researching and developing sustainable technologies. In collaboration with renowned partners such as the Perlan team and the German Center (), strives to make more environmentally friendly and efficient.