Stainless Steel Propeller Titan 3 13.9X19 Right Hand

Function and Technical Context

The three-blade HR Titan stainless steel propeller measuring 13.9×19 inches with right-hand rotation acts as the final link in the transmission chain for outboard motors, converting engine torque into net propulsive thrust on the water. It operates directly on the propeller shaft of the stern drive assembly, in the zone most exposed to the marine environment, where the high-strength stainless steel alloy of the HR Titan series provides superior protection against galvanic corrosion, cavitation and impacts with floating objects compared to conventional aluminum alloys. The 13.9-inch diameter and 19-inch pitch have been selected to place the motor in its optimal rpm range under load, maximizing propulsive efficiency in medium to high-power motors in the 90, 115 and 140 HP segments. If the propeller loses geometry due to bending, erosion or blade breakage, propulsive performance drops immediately, the motor operates outside its design point and vibrations are generated that can damage the shaft, the stern bearings and the reverse gear pinion.

When to Replace This Part?

The clearest signs that a propeller needs replacement are unusual vibrations perceptible in the shaft or hull at different engine speeds, loss of top speed with no apparent cause in the motor, loss of acceleration response and increased fuel consumption; along with visual signals such as cavitation marks on the blades, deformed leading edges or impact cracks. It is recommended to visually inspect the propeller at the beginning and end of each boating season, as well as immediately after any contact with bottom, nets or submerged objects. Replacing the propeller at the first sign of damage prevents dynamic imbalances that transmit to the shaft and stern pinion, turning a simple repair into a costly workshop failure.

Compatible Johnson/Evinrude Motors

Equivalent Manufacturer References