A hybrid-electric aircraft is not defined by adding a generator to a battery. Its value comes from controlling multiple energy sources as one propulsion system.
Energy follows the mission
Take-off, climb and cruise ask different things from the propulsion system. The power split should change with them rather than forcing every phase through one fixed operating point.
Control strategy turns installed hardware into useful range.
Efficiency compounds
Losses appear across generation, conversion, storage, cabling and the electric machine. Each fraction matters because the aircraft must carry both the energy and the hardware that processes it.
System efficiency matters more than a single peak number.
Measure the right outcome
Kilowatts describe components. Payload, range and dependable thrust describe an aircraft.
Propulsion should be judged by the mission capability it unlocks.
Hybrid-electric range is designed across the complete powertrain.