What I see very often, though, is proponents breezily making assumptions that place very strict (unacceptable?) constraints on how the power system will be used. "Then, after takeoff, the batteries will be recharged in cruise flight" etc. To my mind, normal (non-emergency) ops in a powered airplane shouldn't include any approach/landing without the ability to execute a missed approach/go-around. So, if we need to fly for 20 minutes to recharge the batteries, we can't do a safe, normal landing in that window. Can't go beat up the pattern and get 10 landings in an hour. A precautionary landing within the first 20 minutes becomes more than just an inconvenience, etc. A "normal" IC powerplant provides a lot of flexibility: 100% power until the last drop of fuel is used.Back on topic, the viable near-term use I see for hybrid power in aircraft is applications where you need some multiple of cruise power (big multiples, like 2-3x or more) for very short periods. Think electric VTOL that transitions to wingborne flight for cruise.