I did some numbers on Randall Fishman's aircraft. He indicated that it costs $10,000 to replace the battery packs. For each full charge, the battery packs can provide 2 hours of flight time. If translated to gas usage, it would be $12 @ today's gas price. Randall also claims the battery has 800 cycles. That would be 800 flights of 2 hours and about $9,600 for gas if an ICE of the same power output is used. That's about the price of replacing the battery pack. I have not include the cost of charging the battery and the maintenance of the ICE. For the sake of the conversation, let's say they are about the same, give and take a few. Here is the kicker, the electric motor is a lot less expensive than a gas engine and virtually no maintenance required, especially when the power of the engine goes up. Your thoughts?