HR Titan 4 Series 14-1/2"D x 15"P RH Rotation 4-Blade Stainless Steel Thru Hub Exhaust Propeller with 15 Tooth Spline Hub for 225 hp (3553-145-15) by SOLAS Propellers. Stainless steel Solas HR Titan 4 propeller offers excellent stern lift and acceleration and won't compromise on cruising speeds or fuel efficiency. This quality stainless steel propeller delivers powerful thrust and very smooth performance with increased speed and fuel economy in the engine's mid-range. The added cupping on the HR Titan 4 is great for increased maneuverability, keeping your boat on plane and holding tight in turns. The HR Titan 4 also offers a high rake blade design, which provides your boat with good bow lift.