Very impressive.

2 thoughts though. The first being, where did the electrical energy come from to charge the battery?

The second thought is how economical is the solution you have presented?

Consider this: 1 gal of gasoline is approximately 115000 BTU. So say in an airliner burning 2000 lbs per hour we are burning 33810000 BTU per hour. Thats Alot of energy. In all fairness there is alot of inefficiencies in our heat engine. Even at 30% efficiency or stated another way, if we need only 30% of a gallon at 100% efficiency, than we will need at least 10143000 BTU for this example.

Where are we going to get that energy? Batteries are great but they dont run on PFM. That energy comes from somewhere.