ALUMINUM PROPELLER 12.1X9 RIGHT 48-87818A11

Function and technical context

The propeller is the fundamental propulsion element of the marine transmission system, responsible for converting the engine power into forward or reverse movement of the boat. This 12.1-inch pitch, 9-inch diameter aluminum propeller operates on the motor's output shaft, propelling water rearward to generate traction. Its aluminum construction offers an optimal balance between structural strength and lightness, minimizing rotational inertia and improving engine response. Clockwise rotation (clockwise rotation) is designed to synchronize with Mercury engines of the specified series, ensuring maximum propulsive efficiency and predictable directional behavior of the vessel.

When to replace this part?

The propeller requires inspection and possible replacement when symptoms such as abnormal shaft vibrations, loss of maximum speed even at full throttle, audible cavitation (bubbling noise) or visible deformation of the blades are observed. It is recommended to check the condition of the propeller at the beginning of each sailing season and after any impact with submerged objects or bottoms. Although aluminum is resistant to marine corrosion thanks to its nature, impacts, blade erosion and loss of balance compromise hydrodynamic efficiency; Preventive replacement prevents destructive vibrations that affect engine bearings and seals.

Equivalent manufacturer part numbers