公开(公告)号：US11254425B2

公开(公告)日：2022-02-22

申请号：US16595169

申请日：2019-10-07

Applicant: The Aurora Flight Sciences Corporation

Inventor： William Thalheimer ,  Andrew Mark Heafitz

IPC: B64C27/30 ,  B64C27/54 ,  B64C27/467 ,  B64C27/10

Abstract: Rotor assemblies for aircraft are described that include a plurality of blades that are disposed vertically on a common axis along different horizontal planes. When the rotor assemblies are free-wheeling, the blades form a vertically stacked configuration, and when the rotor assembly is driven in rotation to generate lift, the blades bloom out from the vertically stacked configuration. At least one of the blades in the rotor assembly has a blade geometry that is different with respect to other blades such that when the blades are vertically stacked and free-wheeling, the collective shape of the blades is aerodynamic in shape, based on the different blade geometry, that reduces aerodynamic drag on the rotor assembly.

公开(公告)号：US20210101677A1

公开(公告)日：2021-04-08

申请号：US16595169

申请日：2019-10-07

Applicant: The Aurora Flight Sciences Corporation, a subsidiary of The Boeing Company

Inventor： William Thalheimer ,  Andrew Mark Heafitz

IPC: B64C27/54 ,  F01D5/02 ,  B64C27/10 ,  B64C27/467

Abstract: Rotor assemblies for aircraft are described that include a plurality of blades that are disposed vertically on a common axis along different horizontal planes. When the rotor assemblies are free-wheeling, the blades form a vertically stacked configuration, and when the rotor assembly is driven in rotation to generate lift, the blades bloom out from the vertically stacked configuration. At least one of the blades in the rotor assembly has a blade geometry that is different with respect to other blades such that when the blades are vertically stacked and free-wheeling, the collective shape of the blades is aerodynamic in shape, based on the different blade geometry, that reduces aerodynamic drag on the rotor assembly.