STAINLESS STEEL PROPELLER 15x21 RIGHT 48-13702A46

Function and technical context

The propeller is the fundamental propulsion element of the marine transmission system, responsible for converting the engine's power into thrust through rotation in the water. In Mercury Mercruiser petrol engines and Command Thrust systems, the propeller works directly coupled to the tail shaft, transmitting the rotary movement of the engine towards the stern to generate the boat's propulsion. INOX stainless steel guarantees structural strength and durability in saltwater environments, avoiding galvanic corrosion that would quickly degrade a conventional aluminum propeller. A damaged or unbalanced propeller causes loss of hydrodynamic efficiency, abnormal vibrations, increased fuel consumption and a significant reduction in speed and maneuverability.

When to replace this part?

The propeller should be inspected regularly for cracks, deformations, erosion on the leading edges of the blades or loss of material due to impacts with rocks, debris or irregular bottoms. Symptoms of deterioration include persistent vibrations at certain revolutions, abnormal humming, unexplained reduction in maximum speed and erratic behavior in the bow. It is recommended to check the propeller at least once per sailing season and replace it preventively if visible damage is detected, even if it is small; An emergency repair at sea or a complete breakage of a blade is always more expensive than a scheduled replacement. Preventive replacement is especially critical in coastal navigation or in areas with underwater debris.

Equivalent manufacturer part numbers