Aluminum Propeller AMITA3 9.30X10 Right Hand 4111-093-10A

Function and Technical Context

The AMITA3 aluminum propeller with a diameter of 9.30 inches and a 10-inch pitch, right-hand rotation, acts as the final link in the kinematic chain of outboard motors, transforming the rotational torque of the crankshaft into net thrust on the water through its three blades. It works directly on the motor's tail shaft, at the interface between the powerplant and the aquatic environment, being the component that ultimately determines the vessel's propulsive efficiency. Its marine aluminum alloy design guarantees an appropriate strength-to-weight ratio for low and medium displacement engines, while offering acceptable corrosion resistance in both saltwater and freshwater. A 10-inch pitch places this propeller in the optimal acceleration segment for lightweight and semi-rigid vessels powered by 10 to 15 hp motors, allowing the engine to operate within its recommended RPM band without overloading the transmission train. Installing a propeller with incorrect pitch forces the engine to operate outside the design RPM range, which increases fuel consumption, reduces the service life of internal bearings, and may cause peak power losses that are difficult to diagnose without first inspecting the propeller.

When to Replace This Component?

The clearest signs that the propeller requires replacement are vibrations transmitted to the transom during navigation, the inability to reach the usual planing speed, or a noticeable loss of thrust when accelerating—symptoms that generally point to bent blades, blades with bite marks, or cracks caused by impacts against submerged objects, rocky bottoms, or sediments. For aluminum propellers, a detailed visual inspection of the blades is recommended at the beginning and end of each boating season, as this material absorbs impacts by deforming rather than fracturing, so damage is not always evident without close examination. Preventively replacing a deformed propeller, even if the motor starts and operates apparently normally, protects the tail shaft seal against the eccentric vibrations that, if prolonged, can lead to water ingress into the motor housing and considerably more expensive repairs.

Compatible Johnson/Evinrude Motors

Equivalent Manufacturer References