The Allen MP 215 is a total re-design of its MP 205 mechanical-drive riding trowel. With a higher horsepower gasoline engine and heavy-duty drive train, the unit has an air-cooled Honda gasoline engine, two 36-inch-diameter 4-blade non-overlapping rotors and a torque-converter clutch, giving the operator full variable-speed control of the rotors. It has an electric-powered spray system for application of retardant. www.alleneng.com/