Electric Skydive Ops
Electric powerplant for skydive ops might be feasible. You could have a few spare quick exchange batteries ready to go after say 2 sorties of 0.3 - 0.4. You can come down near vertical with the prop charging the batteries. Also climbing in the flight levels would not be a problem as the climb rate would be near linear all the way up as there is no loss of power, only slight loss of wing lift efficiency as you climb. Would be the perfect jumpship to convert a Caravan if the batteries aren't too heavy. Just a crazy thought!