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post #9 of Old 07-03-2013
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Re: Spade rudders vs blue water passage making

Originally Posted by capecodda View Post

BTW/any idea how to inspect for crevice corrosion on a shaft hidden in a bearing without dropping the rudder?
NOPE, you really have to drop it and inspect it firstly with a pocket microscope, then 'dye penetrant' (magnaflux, etc.) ... then the 'clock' to see if you exceeded approx. one million (estimate) load cycles above the 'endurance limit'. With stainless steel you only get about 1 million load cycles that exceed the 'endurance limit' ... after that value, the metal is usually considered 'tired' (embrittled). This is the same reason that old airplanes are scrapped after a certain number of 'take offs and landings' .... their metal gets 'tired' (weak).
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