Multi-c Propeller Alum. 11.6X13 Right Hand

Function and Technical Context

The Multi-C aluminum propeller 11.6x13 right-hand rotation is the propulsion element responsible for converting the outboard motor torque into effective hydraulic thrust, directly determining cruising speed, acceleration response, and overall fuel consumption performance. With a diameter of 11.6 inches and a pitch of 13 inches, its geometry is specifically designed for 4-stroke outboard motors between 40 and 50 HP, ensuring that the engine operates within the RPM band recommended by the manufacturer and without mechanical overstress. Construction in marine aluminum—the material of choice for recreational and intermittent use—provides an excellent strength-to-weight ratio and natural ductility that absorbs impacts with submerged objects in a controlled manner, reducing the risk of damage to the shaft and propeller seals. A deteriorated or unbalanced propeller generates cavitation, loss of traction, increased fuel consumption, and excessive vibration transmitted to the internal transmission of the lower unit, accelerating wear on bearings, seals, and bevel gears.

When to Replace This Part?

The clearest signs that the propeller requires inspection or replacement are anomalous vibrations at the transom, inability to reach cruising RPM with throttle wide open, appreciable loss of top speed, and unjustified increase in fuel consumption. Bent blades, with notches or partial fractures—the usual result of impacts with bottoms, rocks, or floating debris—should be corrected immediately, as even slight deformation causes dynamic imbalance and transmits pulsating loads to the propeller seal and shaft bearing. It is recommended to visually inspect the propeller before each outing and perform a complete technical inspection at the beginning of each boating season; replacing it preventively at any sign of visible damage is the most economical measure to avoid major repairs to the lower unit away from port.

Compatible Johnson/Evinrude Motors

Equivalent Manufacturer References