Replacing the MP 305 mechanical-drive riding trowel, MP 315 is billed as an entry-level trowel with features from larger riders. It comes equipped with a torque converter clutch that provides full variable speed control of the rotors. Other features include: manual steering and blade pitch controls; air-cooled Honda gas engine; two 46-inch-diameter, four-blade non-overlapping rotors reaching speeds of 145 rpm; and electric-powered spray system for retardant application.