Abstract: A high efficiency turf maintenance apparatus having low power consumption and good cutting performance is presented herein. A multi-blade blade assembly is disclosed to reduce power consumed in driving the blade assembly and enhance longevity of a dischargeable power supply. In some aspects described herein, a first blade of the multi-blade assembly can have a first length that is greater than a second length of a second blade. Further, the first blade or the second blade can be substantially bilaterally symmetric about a rotation axis of the multi-blade assembly. In alternative or additional aspects, the second blade can provide lift within a deck of the high efficiency turf maintenance apparatus to propel turf clippings from within the mow deck through a discharge opening therein.

Abstract: A torque limiter assembly and/or damage mitigation assembly that can limit torque and other forces from being applied to a motor or motor assembly of a lawn maintenance device such as a mower. For example, sudden blade-stop events or other events that might damage the motor can instead be absorbed or dispersed by the torque limiter assembly via use of a friction material. The torque limiter assembly can have a shaft and bearings that are independent of the motor shaft and motor bearings. The friction material can serve as a mechanical linkage between the two independent shafts operating to limit torque exchanges between the two shafts that exceed a defined magnitude. In the event that wear or damage is sustained, such will tend to be limited to the torque limiter assembly, which can be repaired or replaced in a more cost effective or simplified manner than the motor assembly.

Abstract: A blade adapter apparatus configured to couple multiple cutting blades to a shaft of an outdoor power equipment. The blade adapter apparatus can simplify attachment of multiple blades, which can be performed prior to interfacing with the outdoor power equipment. The blade adapter apparatus can prevent the multiple blades from being attached according to an improper orientation and prevent the multiple blades from being attached according to an improper order. The blade adapter apparatus can furthermore robustly distribute load from a high energy impact event, and/or maintain a fixed angle between blade tips of a multi-blade assembly.