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Really random I know, but I was thinking if a engine in a huge yacht goes out what do you do? I can't see how you can "swap out" the engine. A engine in a boat like this one below.

Noob question, but wouldn't that made the hull weak?Actually, in many cases, the boat is taken out of the water (Dry Dock) and a HOLE is cut in the side of the hull (Steel Hull) the engines are then replaced, and the hole is welded shut!
Did not know this. Thank you.As with every weld, the weld is usually stronger than the material being welded.
Ive seen it done on 3 separate occasions on early 1970s Fedships. I honestly cannot remember the reason behind it, but Im fairly sure that the blocks on these engines would not fit out through the existing access. I also recall it having to be done for the generator on one occasion....Ive never seen one taken out thru the side of a steel hull, if it was large enough to be a steel boat, the motors would be rather large and have the ability to be rebuilt while on-board (not saying they DONT do it, Ive just never seen that before)
Generator I could understand, being that they are typically against the bulkhead and removal of the engines would be first on the list of getting it out of there! But unless the block was cracked, I dont know why they'd want to pull the motor out the side... Steel being much easier to fix than fiberglass, it may make more sense.. I'm not terribly familiar with single steel hulls, I slept through that class, knowing I wouldnt be working in that field....Ive seen it done on 3 separate occasions on early 1970s Fedships. I honestly cannot remember the reason behind it, but Im fairly sure that the blocks on these engines would not fit out through the existing access. I also recall it having to be done for the generator on one occasion....
AmazingCruise ship/fleet tankers/ cargo ships are all rebuilt while in motion, they are so short rpm'ed motors that they can rebuild one cylinder at a time while its still under way.
.Where did the resident yacht builder go off to...his name is escaping me at the moment.