As others have said spaceships does not go into such detail. It only cares about mass, not volume or surface area.
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Originally Posted by the-red-scare
If the latter (causing the engines to be ridiculously huge at large sizes) should performance decrease, perhaps in a Speed/Range kind of way, as ships get bigger? Could be a justification for “fast” fighters and “slow” capital ships…
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Basically: if you wish. But then the capital ships would have a smaller mass fraction of engines.
But a possible other reason for “fast” fighters and “slow” capital ships is that capital ships have less engines and fuel fraction because they require things like long term crew quarters and likely more armor, thus no need to go into surface area considerations. Whereas a typical fighter would have only a cockpit, weapons, engine and fuel with minimal or no armor.