Multi-c Propeller ALUM.AMITA3 12X10 Right Hand 4311-120-10

Function and Technical Context

The AMITA3 aluminum propeller, with a diameter of 12 inches and pitch 10, right-hand rotation, acts as the final element in the propulsion chain for outboard motors: it converts the engine torque transmitted by the tail shaft into direct hydraulic thrust on the water. Its three-blade AMITA3 profile is designed for low to medium power range motors—specifically for 40 and 50 hp four-stroke ranges—achieving an optimal balance between acceleration response and efficiency at cruising speed. The specific geometry of the blades reduces the tendency to cavitate under normal operating conditions, thus protecting the shaft, hub, and tail bearings. A damaged or unsuitable propeller not only wastes engine energy, but can cause vibrations that accelerate wear on the shaft seals and gearbox gears, resulting in more costly mechanical failures.

When to Replace This Component?

The clearest signs that the propeller needs replacement are perceptible vibrations in the shaft or hull during navigation, loss of top speed or planing performance with no apparent engine issue, and unjustified increase in fuel consumption. Aluminum blades are especially vulnerable to impacts with bottoms, rocks, or entangled lines, which create bends, nicks, or imbalances that are not always evident to the naked eye; therefore it is advisable to perform a detailed visual inspection at the beginning and end of each boating season. Replacing the propeller preventatively at any visible damage, no matter how minor, avoids asymmetric stress on the propulsion shaft and prevents failures in the seals and tail bearings at the most inconvenient moment.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References