Mercury - Enertia 3-Blade Stainless Steel Propeller 13.6" Diameter x 21" Pitch Left-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151242. Overview. There's something special about the moment your boat lifts onto plane - that clean, powerful surge where everything feels perfectly in sync. The Mercury Enertia 3-Blade Stainless Steel Propeller (8M0151242) delivers that feeling every single time. It's fast off the line, steady at speed, and confident through every turn. Built for boate