Abstract: A cutting attachment for forming a swale in a substantially level area of terrain. The cutting attachment is designed to be connected to a landscaping vehicle, such as a skid-steer. The attachment comprises a frame which has a first immobile blade mounted to a front end thereof. First blade is substantially V-shaped when viewed from above and comprises three integrally formed and immovably connected sections. The three sections are disposed at particular angles to each other. Each of the sections includes a straight portion and a rearwardly angled portion that extends outwardly away therefrom. As the landscaping vehicle is moved in a first direction across the terrain, the first blade cuts into the terrain and creates a shallow depression therein. The shallow depression mirrors the profile of the shape of the first blade of the cutting attachment. The attachment further includes a second blade that is pivotally connected to an outer surface of the first blade.

Abstract: A supercharging system for an internal combustion engine, consisting of a positive displacement air pump mechanically driven by the engine, and an electromagnetic clutch activated during high torque demand operating conditions. The system produces a high torque output in a high torque demand range from a relatively small displacement engine, with economy operation during normal engine operating conditions. A flow modulation control system provides a smooth transition from natural aspiration to supercharged operating conditions and includes a sensing of the pressure drop across the throttle plate and modulation of the supercharger air flow into the engine intake in accordance with the sensed pressure differential. The flow modulation also enables high efficiency supercharging with the engine operating under partial pressure supercharging as required in ascending a grade.