Advantage - Boat Builder
Saildrives seem to be a trend in the industry, showing up on more new models each year.The largest advantage is for the yacht builder, because the engine, drive, transmission, and prop are a pre-assembled, aligned "drop-in" subassembly. That saves costs.For the boat owner; maintenance is about the same; you can only change trans oil with the boat out of the water, you must watch the seal around the drive and change it every 7-years (max),you get NO water into the boat (unless the seal fails - in which case you have a serious problem), and there is slightly less prop walk in reverse.The prop is lower, below the boat, and well forward of the rudder with a saildrive - not far behind the keel.