Aluminum Propeller Amita 3 8X9 Right Hand

Function and Technical Context

The three-bladed aluminum propeller with an 8-inch diameter and 9-inch pitch, in right-hand rotation version, acts as the final element of the propulsion chain in small-displacement outboard motors, converting the torque generated by the output shaft into net thrust on the water. It operates in the external propulsion system, connected directly to the motor's tail shaft, and its correct selection in terms of diameter, pitch and rotation direction determines both the propulsive efficiency and the actual load supported by the motor at each operating speed. The aluminum used in its manufacture offers a combination of lightness and toughness especially suited for low-power motors, facilitating lively acceleration and reducing rotational inertia. An incorrectly sized or damaged propeller forces the motor to operate outside its optimal range, causing excessive fuel consumption, cavitation and premature wear of the shaft seal and internal bearings.

When to Replace This Part?

The clearest indicators that the propeller requires replacement are vibrations transmitted to the transom during navigation, loss of top speed without apparent engine cause, and increased engine revolutions without speed increase, an unmistakable sign of cavitation due to eroded or deformed blades. Impacts with rocky bottoms, abrasive sediments or floating debris can bend or nick the blades, altering dynamic balance and subjecting the shaft to radial loads that accelerate deterioration of the seals. It is recommended to visually inspect the propeller at each seasonal maintenance and replace it immediately upon any appreciable deformation, as prolonging its use in poor condition may result in transmission assembly failures with costs far exceeding the replacement part itself.

Compatible Johnson/Evinrude Motors

Equivalent Manufacturer References