Aluminum Propeller AMITA3 15.30X19 Left Hand

Function and Technical Context

This three-blade aluminum propeller AMITA3, with a diameter of 15.30 inches and pitch of 19 inches, acts as the final element of the propulsion system, converting the torque from the outboard or inboard motor into effective thrust on the water. The 19-pitch geometry determines the theoretical advance per shaft revolution, establishing the balance between cruising speed, acceleration, and the motor's working RPM range. Its counter-clockwise rotation (left-hand) makes it specifically suitable for dual-engine installations with counter-rotating propellers or for propulsion units that rotate counter-clockwise from the factory. Selecting the propeller with the correct pitch and rotation is critical for the motor to operate within its recommended RPM band: an oversized propeller in pitch excessively loads the propulsion unit, while insufficient pitch causes overspeed and premature wear of the internal gearbox components.

When to Replace This Part?

The most frequent signs that the propeller requires replacement are vibrations transmitted to the hull or tail shaft, loss of top speed or planing capability, inability of the motor to reach its rated revolutions under full load, and excessive cavitation phenomena visible in the wake astern. Aluminum propellers are especially sensitive to impact with submerged objects, which can bend or fracture the blades and cause dynamic imbalance; therefore, it is advisable to inspect the profile of each blade and the condition of the splined hub at the beginning and end of each navigation season. Timely replacement of a deteriorated propeller protects the stern seal, shaft, and gearbox from secondary damage that results in considerably more costly repairs in drydock.

Equivalent Manufacturer References