The rotating Impinger is designed to sample the airborne movement of a spray cloud at a fixed location to provide datasets that include droplet densities: Dv.1, Dv.5, and Dv.9 values. The impinger uses Teflon coated 1/8″ acrylic rods or 1″ glass slides that are attached in a vertical orientation on each end of a rotating arm, rotating at a known speed. The impinger slide position maintains a rotating speed of 5.6 meters per second based on the motor rpm of approximately 600 rpm and a slide distance position from the center motor shaft location of 18 cm.