Patent 10435149 was granted and assigned to Bell Helicopter on October, 2019 by the United States Patent and Trademark Office.
An Unmanned Aerial Vehicle (UAV) has a first blade assembly configured to rotate in a first direction about an axis of rotation and a second blade assembly configured to rotate in a second direction opposite the first direction about the axis of rotation, wherein the second blade assembly can be selectively cocked relative to the axis of rotation.