As aviation is turning to new technologies and resources to define a sustainable future, some efforts are beginning to become concrete advancements.Gradually leaving the PowerPoint presentation stage, they are being moved to drawing boards and early testing. In other words, the promoters of new propulsion systems, such as hydrogen-fueled engines and hybrid-electric architectures, are delving into the practicalities of the projects.The various endeavors epitomize the different approaches with which a new technology may be tackled. Established players are engaged in a series of multiyear research and technology projects and then development programs. Some startups have chosen to fast-track.The tasks underway vary from ensuring hydrogen technologies will bring actual benefits-as opposed to creating new problems-to spurring investments in sustainable aviation fuels (SAF) and talking to regulators about how to certify entirely new systems.
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