Uh. We're getting into technicalities. I haven't seen the heli theory for a while. I remember 'OR visible moisture'. I'm not blessed with loads of dosh and slaving a lot towards flying. Kinda protracted to put it mildly. I'm getting used to gliding patterns/circuits these days - need a flying fix, even if not choppers. Very straightforward checklist, no engine management. 'Speeding up on base and final for landing' :-P