Jim, that is correct, in the full scale vLazair there is an onboard 15kw generator, powered by a separate gas motor, that charges the batteries in flight. Should never need to charge batteries from the power grid and it will only take about 15 minutes in flight to charge the last landing and last takeoff. The generator is just a JM1 motor attached to a gas motor and its 3 phase output rectified. Generator runs at governed rpm which sets charge voltage. Very light setup.

Dale