WWII subs didn't have steam boilers & steam driven turbine generators. They were all electric. Now instead of duplicating and/or additional equipment inside the tight and $$$ subs. With a separate prop steam turbine, a separate electrical generator, duplicate condensers, pipework etc. and a massive drive shaft. Less noise too without a gear box and turbine on the end of the prop shaft. Now the sub runs just one overall smaller/lighter steam turbine/electrical generator. That doesn't have to be mounted in a straight line with the prop(s). Electric bow thrusters will allow a sub to turn quickly on it's axis . Instead of ploughing in a circle over thousands of yards. Just the ticket for those tense moments. Some cruise ships run electric drives as well. The main engines/generators still run at rated power. The ship just slows down some as the "hotel load" rises when all the ladies are using hair dryers. And the kitchen is cooking before supper. The electric props also allow the props to be steered/pivoted. Which allows easier docking of these huge ships, in small ports without $$$ tugs. The aircraft carriers are going to electric aircraft launching for similar reasons.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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