Mercury - Tempest Plus 3-Blade Stainless Steel Propeller 14.6" Diameter x 23" Pitch Right-Hand Rotation 3-Blade Stainless Steel Polished Finish 8M0151384. Overview. There's a feeling every boater knows when the engine roars, the bow lifts, and your boat glides forward like it was made for the water. That's what you get with the Mercury Tempest Plus 14.6" x 23" Pitch Propeller (8M0151384). It's built for those who crave control and speed in equal measure, offering smooth lift, crisp acceleration,