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Rotational inertia is just another type of load the engine experiences. It is not any different than hauling a trailer, climbing a hill, or pushing through air in the sense that they are all loads the engine needs to oppose. The only difference is that rotational inertia only becomes a load during acceleration. It is a non-issue if the engine is running at a steady rpm. An engine accelerates/revs faster when it experiences less "total" load.
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