Aluminum Propeller AMITA3 12.30X15 Right Hand

Function and Technical Context

This three-blade aluminum propeller with a diameter of 12.30 inches and a 15-inch right-hand pitch acts as the final link in the transmission chain for outboard motors, converting engine torque into hydraulic thrust on the water. It operates in the propulsion system with exhaust gas evacuation through the hub (Thru-Hub Exhaust system), which integrates the exhaust outlet through the center of the propeller and is the standard for the OMC range at these power ratings. Manufactured from marine-grade aluminum, it offers the optimal balance between structural lightness and corrosion resistance in both fresh and saltwater, making it suitable for recreational vessels and intermediate use in the 40 to 75 HP range. A damaged propeller not only reduces maximum speed and fuel efficiency, but can induce vibrations that deteriorate the shaft seal, foot bearings, and rubber hub, generating secondary failures with costs far exceeding that of the propeller itself.

When to Replace This Part?

The clearest indicators that the propeller requires replacement are: inability of the engine to reach maximum RPM under normal load conditions, perceptible vibrations at the motor foot or transom, persistent cavitation, difficulty in planing and disproportionate increase in fuel consumption relative to thrust obtained; blades with eroded, bent or notched leading edges alter the effective pitch and worsen all these symptoms. A detailed visual inspection is recommended at the beginning of each season and after any impact with a submerged object, as even minor deformations alter the dynamic balance of the propeller. Replacing it preventively upon any deformation prevents progressive damage to the rubber hub and foot gears, whose repairs are considerably more costly than replacement of the propeller itself.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References