i thought you where joking.
hybrid cars have a petrol engine charging the battery. so they are not much different from a normal car.
they (and ev's) also use regenerative braking to charge the battery. ie when they go down hill or slow down, they get about 30% of the power back that they used to go up the hill. but if the hybrid only ever drives on the flat at constant speed (like an aircraft) the regen and battery do absolutely nothing.
for aircraft, there is no hills to climb up and down like a car, so recharging is not useful. the biggest problems is simply weight vers the amount of power storage, vers how many paying passengers you can carry. plus weather factors and safety issues.
also the only time aircraft go "down hill" is when they go to land. charging up the battery doesn't help extend the range of the trip because the trip has ended.
yes you can charge by air flow, such as the RAT, but your trading air speed for battery power, so you keep going slower until you crash.
you can't fly along and recharge at the same time, thats perpetual motion.
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