Aluminum Propeller AMITA3 14.3X21 Left Hand 2512-143-21

Function and technical context

The AMITA3 left-hand propeller with a diameter of 14.3 inches and a pitch of 21 inches acts as the final element in the drive train, transforming the rotational energy of the engine into hydraulic thrust that propels the vessel. Its counter-rotating direction makes it indispensable in dual-engine OMC installations, where it is paired with a right-hand pitch propeller to neutralize yaw torque and maintain a stable straight course without steering effort. The geometry of its three blades is calibrated to provide balanced performance between cruising speed and acceleration response in medium-displacement vessels. Manufactured in marine aluminum alloy, it combines structural lightness with corrosion resistance suitable for both freshwater and saltwater navigation under normal operating conditions. A deteriorated or unbalanced propeller not only reduces effective thrust, but also transmits vibrations to the propeller shaft, accelerating bearing wear and compromising the integrity of the stern seal.

When to replace this propeller?

The most common signs that the propeller requires replacement are: abnormal vibrations perceptible at the stern or rudder during navigation, loss of top speed with no attributable cause to the engine, cavitation phenomena when accelerating—characterized by sudden loss of traction and visible effervescence under the stern—and physical damage such as warping, cracks or nicks on the blades caused by impacts with submerged objects. It is recommended to visually inspect the propeller at each haul-out or seasonal service, paying special attention to the condition of the rubber hub, as even slight blade warping alters dynamic balance and progressively accelerates shaft bearing deterioration. Replacing the propeller preventively after any impact, however minor the damage may appear, prevents more costly repairs to the gearbox and stern seal assembly.

Equivalent manufacturer references