公开(公告)号：US20190351999A1

公开(公告)日：2019-11-21

申请号：US15982420

申请日：2018-05-17

Applicant: Bell Helicopter Textron Inc.

Inventor： Frank Bradley Stamps ,  Michael K. McNair ,  John Richard McCullough

IPC: B64C27/00 ,  B64D27/10 ,  B64D27/24 ,  B64C27/08

Abstract: A propulsion assembly for a rotorcraft includes a blade assembly, a drive shaft coupled to the blade assembly and an electric motor coupled to the drive shaft and operable to provide rotational energy to the drive shaft to rotate the blade assembly. The propulsion assembly includes a landing assistance turbine coupled to the drive shaft and operable to selectively provide rotational energy to the drive shaft during an underpowered descent to rotate the blade assembly and provide upward thrust, thereby reducing a descent rate of the rotorcraft prior to landing.