Heedm "If this is so, then the disc won't follow, it will stay with the helicopter." - true but the swash plate will help I suppose.
ALSO (various) FORCES don't mean ENERGY is happening. FORCES need to be applied over a DISTANCE eg 1 JOULE if you push a NEWTON for 1 METER. If you do it at a rate eg 1 METER per SECOND then you're talking POWER ... 1WHAT?
Good night (really)