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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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