Mercury - Enertia ECO Propeller 16" Diameter x 19" Pitch Right-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151255. Overview. There is a certain calm that comes when your boat feels perfectly dialed in - when power, control, and efficiency all meet in one smooth motion. That's what it's like running the Mercury Enertia ECO propeller. Built for boaters who want to go farther without compromise, it delivers effortless lift, steady cruising, and the kind of fuel savings that let you