When you feel a vibration in the driveline and a loss of power, it might cause damage to the propeller. A propeller blade is a rotating fan that displaces water when rotated and exerts linear thrust upon a working fluid, such as water or air. It works by turning torque into thrust and then converting power into action. When the propellers turn, it creates a force to move the flowing water downward and behind the blades. Consider the design of propeller blades to remove water. Always check your propeller blades, especially if going on a long boat trip. Key Features: Introduction to provide the tournament towboat a strong, exceptionally smooth, and steady pull. Find a high-performance propeller with strong and affordable performers. Specifications: Brand: OJ Propellers SKU: 1233B UPC: 01073B Weight: 10.00 LBS Size: 13 x 14 Part Number: 1233 B Shaft Size: 1" Standard, keyway, Tapered, Rotation: Left Hand Material: Nibral Number Of Blades: 4 cupped