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
Cost/benefit analysis.
Submarines and Aircraft carriers are few in number so the cost is worth it. Submarines need to be able to go as long as possible without surfacing for refueling/resupply so nuclear is best. Aircraft carriers are so massive that a nuclear reactor makes the most sense. Everything else it makes more sense to just use conventional fuels.
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