I was speculating about this with a friend the other day. The problem is the battery recharge time is way more than the flight time. You need better than 1:1 f

I was speculating about this with a friend the other day. The problem is the battery recharge time is way more than the flight time. You need better than 1:1 for this to work. Beamed power (sufficient to power something's lift) is going to have a scary energy density. Maybe mechanical energy storage is the way to go; use counter-rotating flywheels that you can spin up rapidly, and then bleed off rotational power directly into the fans. Use a battery for powering control circuitry only.