Many of the vehicle concepts under study for the coming wave of urban air mobility (UAM) are the size of today’s small helicopters, so it is perhaps no surprise that major propulsion players in the current vertical-lift market are laying out plans to compete for this next big opportunity. With larger size comes the need for more power and, with battery technology still lagging, these future propulsion systems are focused on gas turbine-based hybrid-electric concepts rather than ...

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