Original Message

SWP is a power issue. SWP is pure and simple not having enough power to leave or maintain a high hover with the power avaiable. In either case, the aircraft starts descending. VRS initiates with or without sufficient power when the descent can not be arrested with 'typical' lift. I say it that way because I am told that some helos have the excess power to use pure thrust to stop VRS-particularly lightly loaded Aircranes.