AgustaWestland is applying for 3 US Patents on this craft. Application Nbrs; 20130026303, 20130026304, 20130026305.
Claims in these applications have been previously, and publicly, discussed on this Rotorhead forum.
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This is a 'compressed' version of one claim.
"rotor .. being operable as .. an electrical power generator for re-charging said storage device ... by .. the action of a wind current.
Said .. rotor .. in a direction facing the wind current, when .. on ground and said storage device .. needs to be re-charged."
Some knowledgeable people on PPRuNe had a very, very serious discussion about this recharging concept in
this 2006 thread.
Dave