Mart,
The big headache is how to generate the electrical power.
The good news is that the helicopter will be fly-by-wire.
The bad news is that the wire will be from the helicopter to the ground.
Slowrotor,
Information on this motor [Plettenberg ~ Inrunner ~ HP 370/40 Heli] is located here.
http://www.plettenberg-motoren.com/U..._40h/Motor.htm
An electric motor for a manned helicopter will have to be a little closer to the ones that Mart mentioned. However, four or five Plettenberg ~ Predators, at 11KW each might do.
http://www.plettenberg-motoren.com/U...ator/Motor.htm
Dave