5 UNAVOIDABLE THREATS TO PROPELLER AND RUDDER

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Most boat rudders and propellers are cast from perpetual quality alloys in an effort to reduce corrosion and other wear from immersion and performance in seawater. Depending on the design and requirements of the boat, inboard rudders are well organized and not so susceptible to wear as the outboard ones.

Boat propellers are designed to suit the hull and engine configuration, having three, four, or five blades.

The following describes the repair of worn-out rudders and propellers;

1. Corrosion from seawater:
Propellers and rudders are usually cast correctly from high-quality alloys having resistance to seawater corrosion. Over time, immersion in seawater forms a film on the boat's propellers and rudders, acting as a protection against extended use in seawater.

However, cheaper inferior alloys that have been badly cast will not develop this overall protective film, but a patchy one. This allows the seawater to corrode the components, exhibiting the classic green color oxides in bronze components and red/brown oxides for stainless components.

2. Erosion
This is a mechanical form of corrosion caused by the rotation of the propeller producing air bubbles. These bubbles flow, constantly bombarding and bursting against the rudder surfaces, creating pitting.

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