Irlandes, are they talking about recirculation when they say power settling? It can be as much of a gotcha as vortex ring if you are operating into small sites with fences and buildings around them (Northern Ireland forts for example). Someone once bounced a Wessex 5 feet back into the air in a lovely place called Forkhill when he flared to the high hover just above the fence and then ran out of power as we sank into the fort and recirculation help us plummet earthwards. Thank God for the Wessex undercarriage!!