Abstract: A rotary lawn mower cutting blade with reduced drag and improved cutting ability includes a central mounting section, intermediate sections, and outboard sections along a common longitudinal axis and disposed about a common center of rotation. The outboard sections include downward and inward projecting sections. The cutting blade also preferably includes cutting edges on the full extent of the leading edge of the outboard section including the downward and inward projecting sections. Additionally, the outer section can be twisted slightly to enhance airflow upward.

Abstract: A rotary lawn mower cutting blade with reduced drag and improved cutting ability includes a central mounting section, intermediate sections, and outboard sections along a common longitudinal axis and disposed about a common center of rotation. The outboard sections includes downward and inward projecting sections. The cutting blade also preferably includes cutting edges on the full extent of the leading edge of the outboard section including the downward and inward projecting sections. Additionally, the outer section can be twisted slightly to enhance airflow upward.

Abstract: A rotary lawn mower cutting blade with reduced drag and improved cutting ability includes a central mounting section, intermediate sections, and outboard sections along a common longitudinal axis and disposed about a common center of rotation. The outboard sections includes downward and inward projecting sections. The cutting blade also preferably includes cutting edges on the full extent of the leading edge of the outboard section including the downward and inward projecting sections. Additionally, the outer section can be twisted slightly to enhance airflow upward.

Abstract: A flexible coupling for flexibly joining two rotating or moveable members includes a unitized body having a first end and a second end coaxial to each other, and therebetween having one or more coaxial longitudinally spaced disks with center holes; two or more axial spacing portions formed from the body of each disk to provide a spacing means and joining means for unitizing the disks to each other; means for joining the unitized disks to the first and second ends; and means at the first end for coaxially connecting to a first one of the two rotating or moveable members, and means at the second end for coaxially connecting to a second one of the two rotating or moveable members.