Multi-d Propeller ALUM.AMITA3 13X21 Right Hand 2411-130-21

Function and Technical Context

The AMITA3 aluminum propeller element with Multi-d geometry and three blades acts as a direct interface between the engine power and the aquatic medium, converting crankshaft torque into net thrust on the hull. With a diameter of 13 inches and a pitch of 21 inches, this propeller is optimized for right-hand rotation outboard motors in the mid-to-high power range, offering a balanced trade-off between acceleration response and maintenance of cruising speed. The Multi-d design of its blades distributes hydrodynamic load progressively, reducing parasitic cavitation and slip in flat and rough sea conditions. A propeller in poor condition or with incorrect pitch imposes inadequate operating regime on the engine, increases fuel consumption and can cause vibrations that damage the shaft seal and tail bearings.

When to Replace This Part?

The clearest signs that the propeller requires inspection or replacement are: persistent vibration at the stern at any rpm, appreciable loss of top speed with no apparent engine cause, excessive cavitation and difficulty in reaching nominal RPM under full load. Blade bends, impact nicks or advanced galvanic erosion reduce propulsive efficiency immediately and transmit shock loads to the shaft, vibration dampening bushing and reduction gearbox. It is recommended to visually inspect the propeller at the beginning and end of each boating season, and proceed with preventive replacement at any detectable deformation, as prolonging the use of a damaged propeller can result in serious and costly transmission failures.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References