Aluminum Propeller AMITA3 12.0X17 Right Hand

Function and Technical Context

The AMITA3 aluminum propeller with a diameter of 12.0 inches and a pitch of 17 inches acts as the final element in the outboard motor's propulsion chain, converting engine torque into hydrodynamic thrust to move the vessel through the water. Its three-blade design with right-hand rotation and Thru-Hub exhaust system—that is, with gas discharge through the hub—minimizes hydrodynamic drag and improves propulsive efficiency at cruise speed and at full load. This configuration is specific to Johnson and Evinrude outboard motors in the 40 to 75 HP range, ensuring that the motor operates within the RPM range recommended by the manufacturer. A propeller with incorrect pitch, bent blades, or cavitation directly causes loss of maximum speed, increased fuel consumption, and mechanical overload that significantly shortens the engine's service life.

When to Replace This Propeller?

The most common signs that the propeller requires replacement are abnormal vibrations perceptible in the shaft or hull at different operating speeds, inability to reach the specified maximum RPM, persistent cavitation during navigation, and noticeable loss of acceleration or maximum speed compared to the vessel's usual values. It is recommended to visually inspect the blades at the beginning and end of each boating season, checking for the absence of impacts, microcracks, bends, or cavitation erosion, as any deformation alters the dynamic balance and propulsive performance. Replacing the propeller preventively at the first sign of structural damage avoids more costly failures in the transmission system and ensures safe navigation.

Compatible Johnson/Evinrude Motors

Equivalent Manufacturer References