Nuclear generators need no oxygen, so a nuclear sub can stay underwater for weeks at a time. The limits of battery technology severely constrain the amount of time a diesel sub can stay underwater.īecause of these limitations of batteries, it was recognized that nuclear power in a submarine provided a huge benefit. Battery operation is the only way a diesel sub can actually submerge. The batteries power electric motors driving the propellers. Once the batteries are fully charged, the sub can head underwater. The sub must surface (or cruise just below the surface using a snorkel) to run the diesel engines. Or they can work in combination, one engine driving a propeller and the other driving a generator. The diesel engines can run propellers or they can run generators that recharge a very large battery bank. Most diesel subs have two or more diesel engines. A diesel submarine is a very good example of a hybrid vehicle.
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