Would a nuclear-powered carrier sent into the past have a larger and more durable impact than HMS Nelson at Trafalgar?
Short answerIt would retain propulsion longer, but aircraft fuel and replacement parts would still matter. A 1941 industrial base would offer more support than the economy of 1805.
NotesA nuclear reactor could keep the carrier moving for a long time, but other machinery would still need replacement parts. Its jets would also need fuel. The outcome therefore depends on the receiving society's industrial capabilities as well as the ship's propulsion. Returning from the 1980s or 1990s to 1941 gives the carrier a much stronger technological base to work with than sending HMS Nelson to 1805.