Aluminum Propeller AMITA3 15.8X15 Left-hand

Function and Technical Context

As the final element in the propulsion chain, this aluminum propeller from the AMITA3 series converts the rotational energy of the engine into effective hydraulic thrust, directly determining cruise speed, acceleration performance, and fuel consumption. With a diameter of 15.8 inches and a pitch of 15 inches, its geometry is specifically designed for high-power engines around 225 hp to operate within their optimal RPM range, maximizing performance without overloading the propulsion unit. The left-hand rotation—counterclockwise when viewed from aft—makes it the essential solution for counter-rotating installations or dual-propeller configurations where the port shaft requires reverse rotation. The three-blade profile of the AMITA3 series balances thrust during acceleration with efficiency at cruise speed, reducing cavitation and vibrations transmitted to the hull. Installing a propeller with incorrect pitch or rotation direction causes the engine to operate outside its power curve, resulting in excessive fuel consumption, overheating, and premature bearing, shaft, and stern tube wear.

When to Replace This Component?

The clearest signs that an aluminum propeller should be replaced are: abnormal vibrations perceptible in the shaft or hull at certain RPM, evident loss of top speed or acceleration response, and excessive cavitation manifested as characteristic rumbling noise or visible effervescence beneath the vessel. Aluminum blades are especially vulnerable to deformation, bite marks, cracks, and fractures following impact with floating objects, rocky bottoms, or sandbars, so it is essential to perform detailed visual inspection at the start of each boating season and immediately after any grounding or collision. Preventively replacing a deformed or damaged propeller, even when the damage appears minor, avoids asymmetrical stress on the shaft, rubber bearing, and stern tube, saving more costly haul-out repairs.

Equivalent Manufacturer References