Abstract: A chainsaw includes a sprocket coupled to a chain and configured to drive the chain, wherein the sprocket comprises a receiving area defining a drive surface; a clutch disposed at least partially in the receiving area of the sprocket, wherein the clutch comprises: a hub defining a central axis, the hub being rotationally keyed to an output shaft of a motor; a centrifugal weight disposed between the hub and the sprocket and movable in a radial direction relative to the central axis; and a spring compressed between the hub and the centrifugal weight to bias the centrifugal weight in a radial direction towards the central axis; wherein the centrifugal weight comprises a drive feature on a radially outer surface, and wherein the drive feature is configured to selectively interface with the drive surface of the sprocket when the output shaft is rotating above a threshold rotational speed.

Abstract: Blowers, e.g., for use in outdoor applications, are provided. A blower includes an air inlet; an air outlet; and a fan assembly disposed between the air inlet and the air outlet. The fan assembly has a multi-stage fan. The multi-stage fan includes a plurality of axial fans mounted on a drive shaft and a plurality of stator fans arranged in series with the axial fans, wherein each axial fan comprises a plurality of blades each having a blade tip. Each stator fan includes a stackable housing segment. Each of the stackable housing segments are coupled together in series to form the blower housing.

Abstract: Blowers, e.g., for use in outdoor applications, are provided. A blower includes an air inlet; an air outlet; and a fan assembly disposed between the air inlet and the air outlet. The fan assembly has a three-stage fan. The three-stage fan includes three axial fans mounted on a drive shaft and three stator fans arranged in series with the axial fans, wherein each axial fan comprises a plurality of blades each having a blade tip. The three-stage fan has a dimensionless flow coefficient ? in a range from about 0.3 to 0.5 as calculated by the equation ?=(q/(A))/?R where q represents flow (m3/s), A represents cross sectional area at the fan (m2), ? represents speed (rad/s) and R represents fan tip radius (m) measured at a blade tip.

Abstract: Blowers, e.g., for use in outdoor applications, are provided. A blower includes an air inlet; an air outlet; and a fan assembly disposed between the air inlet and the air outlet. The fan assembly has a three-stage fan. The three-stage fan includes three axial fans mounted on a drive shaft and three stator fans arranged in series with the axial fans, wherein each axial fan comprises a plurality of blades each having a blade tip. The three-stage fan has a dimensionless flow coefficient ? in a range from about 0.3 to 0.5 as calculated by the equation ?=(q/(A))/?R where q represents flow (m3/s), A represents cross sectional area at the fan (m2), ? represents speed (rad/s) and R represents fan tip radius (m) measured at a blade tip.