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The rudder has split apart on my Hurley 20. Is it because the tangs rudder post and tangs have become corroded causing them to expend and crack the rudder shells apart?

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The rudder has split apart on my Hurley 20. Is it because the tangs rudder post and tangs have become corroded causing them to expend and crack the rudder shells apart?

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I had to rebuild the rudder on my Hurley 20 due to corrosion on the stainless post where it exits the boat. I used a grinder with a thin cutting disk to cut around the periphery of the rudder, then split the two halves, removed the old rudder post and tangs. Glued the two halves back together with epoxy resin and filled the perimeter of the blade with thickened epoxy. One other thing I did was use a dremel tool to router a cove where the stainless rudder post enters the top of the rudder blade and exits the bottom of the rudder blade. I filled this cove with 3M5200. The reason for this mod is that the flexible 5200 is less likely to let water into the rudder than the brittle epoxy. The rudder was then filled with expanding polyurethane foam and the sinker and riser holes for the foam filled with epoxy filler.

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