公开(公告)号：US20210197962A1

公开(公告)日：2021-07-01

申请号：US16790304

申请日：2020-02-13

Applicant: Bell Textron Inc.

Inventor： Albert Gerard Brand ,  Ronald Lorenz Kisor

IPC: B64C27/00 ,  B64C27/57 ,  B64D43/02

Abstract: A system and method for protecting a rotorcraft from entering a vortex ring state, the method including monitoring a vertical speed of a rotorcraft, comparing the vertical speed to a vertical speed safety threshold, and performing vortex ring state (VRS) avoidance in response to the vertical speed exceeding the vertical speed safety threshold. The performing the VRS avoidance includes determining a power margin available from one or more engines of the rotorcraft, limiting the vertical speed of the rotorcraft in response to the power margin exceeding a threshold, and increasing a forward airspeed of the rotorcraft in response to the power margin not exceeding the threshold.