Advances in hydrogen fuel cells for vehicles are giving aerospace another low-carbon propulsion option.

Startup Elroy Air begins flight tests of a large VTOL unmanned aircraft designed for responsive logistics.

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As more hydrogen-powered vehicles hit the roads, fuel cells are attracting interest for electric aviation.

NASA eyes electric demo; DLR plans electric regional; UK launches Future of Flight; Impossible’s flying battery; ROBOpilot crashes.

Advances in aerospace vehicles almost always follow advances in propulsion. And propulsion technology continues to advance, creating new opportunities. So what is in store for the future? Attending the AIAA Propulsion & Energy conference in Indianapolis, senior editor Guy Norris and technology editor Graham Warwick discuss possibilities ranging from nuclear rockets to electric aircraft.

Sweden’s all-electric regional; design challenge winner; Dzyne’s robotic pilot; dissipating wake vortices; active flow-control X-plane.

New techniques reduce risk for SLS as NASA steps up test campaign for Europa Clipper cargo version.