Aeration: To all boat owners with inboard engines: Next time you haul your vessel, check the rudders for pitting and in extreme cases pitting of the propellors. If you notce pitting on the rudders your propellors could very well be the wrong pitch or diameter. This pitting occurs when the wrong pitch or diameter props are installed. The barometric pressure in front of the props becomes so low that water actually boils at surface temperature from the prop friction. This produces bubbles that explode at and around the rudders and in extreme cases on the props themselves. If pitting is noticable then a re-evaluation of the prop pitch and diameter is necessary. Contact a highly reapected propellor shop to correcty size the props to the vessel.

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