Aluminum Propeller AMITA3 9.30X9 Right-Hand 2111-093-09

Function and technical context

The AMITA3 9.30X9 right-hand pitch propeller acts as the final element of the transmission line in outboard motors, converting engine torque into hydraulic thrust on the water through the clockwise rotation of its blades. It works directly coupled to the output shaft of the reduction gearbox of the propulsion unit, being the component that ultimately determines the pulling capacity, top speed, and RPM range at which the motor normally operates. Its construction in marine aluminum alloy provides the lightness required for 9 HP motors, favoring agile acceleration response and reducing dynamic loads on the bearings and seals of the propeller shaft. The 9.30-inch diameter together with the 9-inch pitch are sized so that the motor reaches the RPM band specified by the manufacturer under normal load conditions, avoiding both overspeeding due to under-pitch and bogging down due to over-pitch. A propeller in poor condition or with incorrect geometry causes loss of thrust, increased fuel consumption, excessive stress on the reduction gearbox, and premature wear of the internal components of the propulsion unit.

When to replace this part?

The clearest signs that the propeller needs replacement are: abnormal vibrations transmitted to the steering helm or to the hull at any cruising speed, inability to reach maximum RPM under normal navigation conditions, progressive loss of thrust, and visible physical damage such as bent blades, leading edges chipped by impact with submerged objects, or surface erosion from cavitation. It is recommended to visually inspect the propeller at the beginning and end of each boating season, checking blade balance and hub condition, as a deformed blade generates asymmetric loads that accelerate the deterioration of the shaft seals and bearings. At any sign of deformation, however minor it may seem, immediate replacement of the propeller prevents more costly transmission failures during navigation.

Equivalent manufacturer references