Realised that most modern submarines (and some aircraft carriers) use nuclear power, but destroyers and frigates don’t. I don’t imagine it’s a size thing, so I’m not sure what else it could be.
In: Engineering
It’s an operational thing.
A submarines biggest advantage is its ability to submerge and hide, it’s biggest disadvantage is having to surface.
Conventional engines need oxygen for the combustion cycle, they can only stay under on battery power. Nuclear subs don’t have this limitation.
So long as they have enough food and air for the sailors aboard, a nuclear sub could stay submerged indefinitely.
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