fundamental personality disorder
ConingAngel:
Sorry to report that it's not the helicopter, it's the fundamental brain structure.
BUT, compared to some things obsessive persons get into, it's far preferable; compare heliaddiction with, for instance, bank robbing, car stealing, mercenary soldiering, ambulance chasing, or (gasp!) being a politician!
So if it wasn't helis, it would be something else. His personality was damaged in childhood (mom was terrorized by a low-flying chopper, perhaps?), and they've closed all the mental hospitals, so there's very little you can do. Try wearing a beanie with a rotor on the top, hover around the bedroom wearing nothing else, possibly he'll notice you.
(I'm visiting with my preschool grandkids while putting my son-in-law through his Instrument Rating. My daughter his wife keeps taking me aside and fiercely whispering "I don't mind his being all wrapped up in this training. What scares me is, what is he going to take up NEXT??")