Mercury - Enertia 3-Blade Stainless Steel Propeller 13.6" Diameter x 21" Pitch Right-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151243. Overview. You know that moment when your boat lifts onto plane the surge, the balance, the smooth acceleration that feels effortless? That's the kind of performance you get from the Mercury Enertia 3-Blade Stainless Steel Propeller (8M0151243). It's more than just speed it's about the connection between you, your boat, and the water. This prop g