| Definition |
When a propeller moves through water, the water is forced against the pressure side of the propeller. The faster the propeller blades cut through the water the lower the pressure on the reverse side of the blades. At a certain speed, which varies from case to case, the pressure on the reverse side of the blade becomes so low that the water begins to “boil” - and bubbles of steam mixed with air are formed. The resulting damage is similar to corrosion and is therefore known as cavitation corrosion. The reasons for cavitation can be many; an unevenness of the propellers leading edge, exaggerated cupping, blade edges that are too sharp or poor surface finish are a few such reasons.
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