Donald Gary Hunter

US Patent:

20210122491, Apr 29, 2021

Filed:

Oct 23, 2019

Appl. No.:

16/661035

Inventors:

- Chicago IL, US
Donald J. Hunter - Scottsdale AZ, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

B64D 45/00
B64C 27/06
B64C 27/00
B64F 5/60

Abstract:

A method is provided for alerting a rotorcraft crew member of a potential collision of a rotor blade of the rotorcraft having a rotor shaft and a rotor azimuth. The method comprises estimating a total rotor flapping value associated with the rotor blade during an operating condition of the rotorcraft. The estimated total rotor flapping value is relative to the rotor shaft as a function of the rotor azimuth. The method also comprises comparing the estimated total rotor flapping value to a rotor flapping limit value during the operating condition of the rotorcraft. The method further comprises sending a warning signal to a warning device when the estimated total rotor flapping value lies outside of the rotor flapping limit value to alert the rotorcraft crew member of a potential collision of the rotor blade of the rotorcraft.