公开(公告)号：US20190127059A1

公开(公告)日：2019-05-02

申请号：US15796910

申请日：2017-10-30

Applicant: Bell Helicopter Textron Inc.

Inventor： Levi C. Hefner ,  Frank B. Stamps

IPC: B64C27/82 ,  B64C27/12

Abstract: There is provided a rotorcraft, including a body, including a front portion and a tail portion; a main rotor system coupled to the front portion of the body, the main rotor system operable to provide a lifting force on the body; and an anti-torque system coupled to the tail portion of the body, the anti-torque system including a primary tail rotor system and a secondary tail rotor system; wherein the primary tail rotor system and the secondary tail rotor system are operable to provide a first anti-torque force and a second anti-torque force. In other aspects, there are methods of providing anti-torque force in a rotorcraft.

公开(公告)号：US10940945B2

公开(公告)日：2021-03-09

申请号：US15796910

申请日：2017-10-30

Applicant: Bell Helicopter Textron Inc.

Inventor： Levi C. Hefner ,  Frank B. Stamps

IPC: B64C27/82 ,  B64C27/12

Abstract: There is provided a rotorcraft, including a body, including a front portion and a tail portion; a main rotor system coupled to the front portion of the body, the main rotor system operable to provide a lifting force on the body; and an anti-torque system coupled to the tail portion of the body, the anti-torque system including a primary tail rotor system and a secondary tail rotor system; wherein the primary tail rotor system and the secondary tail rotor system are operable to provide a first anti-torque force and a second anti-torque force. In other aspects, there are methods of providing anti-torque force in a rotorcraft.

公开(公告)号：US20200070996A1

公开(公告)日：2020-03-05

申请号：US16120676

申请日：2018-09-04

Applicant: Bell Helicopter Textron Inc.

Inventor： Levi C. Hefner ,  Frank B. Stamps ,  Alan C. Ewing ,  Jaret F. Burgess ,  Carey W. Cannon

IPC: B64D35/04 ,  B64C27/26 ,  B64C27/14 ,  B64C27/06 ,  B64C27/82 ,  B64C11/30

Abstract: A pusher rotorcraft is provided in one example embodiment and may include at least one engine in mechanical communication with a drop-down gearbox; a driveshaft in mechanical communication with the drop-down gearbox, a main rotor gearbox, and a tail system gearbox; a main rotor system in mechanical communication with the main rotor gearbox; an anti-torque system in mechanical communication with the tail system gearbox; and a pusher propeller system in mechanical communication with the tail system gearbox.

公开(公告)号：US10210856B1

公开(公告)日：2019-02-19

申请号：US15933810

申请日：2018-03-23

Applicant: Bell Helicopter Textron Inc.

Inventor： Levi C. Hefner ,  Frank B. Stamps

IPC: G10K11/178 ,  G10K11/175 ,  B64C27/04 ,  B64C27/82 ,  H04R1/28

Abstract: A noise control system for a ducted rotor assembly, the ducted rotor assembly including a hub, a duct, and two or more blades coupled to the hub and supported by the duct. The noise control system including a microphone configured to receive a sound input generated by the ducted rotor assembly, the microphone configured for association with the hub; a speaker unit configured to generate a cancellation noise, the speaker configured for association with the hub; and a controller operably connected to the microphone and the speaker unit, the controller configured to selectively adjust harmonics of the cancellation noise to reduce an acoustic signature of the ducted rotor assembly. In another aspect, there is provided a rotorcraft with a ducted rotor assembly in a tail portion including a noise control system. In a third aspect, there is a method of reducing an acoustic signature of a ducted rotor assembly.