Mercury - Tempest Plus 3-Blade Stainless Steel Propeller 14.6" Diameter x 26" Pitch Right-Hand Rotation 3-Blade Stainless Steel Polished Finish 8M0151387. Overview. Every serious boater knows the feeling when your engine roars to life, the throttle pushes back just right, and the boat leaps forward with purpose. That's what the Mercury Tempest Plus 14.6" x 26" Pitch Propeller (8M0151387) delivers: clean power, sharp response, and the kind of control that makes you feel connected to the water.. I