Originally Posted by Chief Engineer
transmission in reverse........prop had shown some signs of electrolysis
due to stray current
at marina...prop and zinc are tight.
I have heard of this before but I don't remember where.
At what rpm
? Probably a hamonic condition at a rpm
range that should avoided (more to do with bearings and bushing wear). If so the chances of really finding the cause is slim. But changing anything in the drive train line-up might stop it, even as simple as putting the zincs at a different section of the shaft.