mobocracy
Active Member
Fair points. Just look at Mercruiser's continued use of mild steel for the steering pin on Bravo 3 drives. That mild still will always corrode, chew up the seal, and cause a leak that eventually rots the transom ring. Simply switching that one part to stainless steel would reduce a big source of damage.
TBH though, Mercruiser basically failed on the pods so it might not be the best comparison. They teamed up with Cummins to co-engineer Zeus and the partnership fell apart. It may not be corrosion-related, but Zeus owners other problems like seals that get blow out and cause leaks.
I think Mercruiser's inability to do a pod drive is probably a function of Sea Ray/Brunswick's failure to move into the large yacht market successfully. I think they were counting on the same vertical integration "advantages" that they had with Mercruiser -- own the company that makes the drive, don't bother being super competitive since it'll be the only power choice.
I don't know how their deal with Cummins fell apart, but it wouldn't surprise me if Cummins wanted more input or demanded more ongoing engineering investment in the solution and Brunswick was generally only interested in good enough.
But really, my larger take is that pod drives are basically stern drives rotated to the hull from the stern. OK, they're not, but in some conceptual way they are -- more than just a drive shaft and prop at least. If they can be made robust enough for long-term wet slipped salt water boats, I see no reason why the same anti-corrosion concepts can't be applied to stern drives.