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The Empire State was a relatively quiet ship since she only used steam power to drive the turbines, which then spun the generators that made the electricity needed to energize the powerful electric motors, which were directly geared to turn the propeller shafts. All in all, the ship was nearly vibration free, making for a smooth ride.
With the sound of three short blasts on the ship’s whistle, we backed away from the pier. This ship was unlike most ships and we all noticed a definite difference in her sounds and vibrations. At that time, most American vessels were driven by steam propulsion that relied on superheating water. The reciprocating steam engines, with their large pistons, were the loudest as they hissed and wheezed, turning a huge crankshaft. Steam turbines were relatively vibration free, but live steam was always visible as it powered the many pumps, winches, etc. Steam is powerful and efficient, but can be dangerous and even deadly. Diesel engines were seldom used on the larger American ships of that earlier era since they were not considered cost or energy efficient. Led by German ships, diesel driven vessels, they are now the most popular engines in use.
The NS Savanna was the only nuclear merchant ship, ever built. Launched in July 21 1959, at a cost of $46.9 million, the NS Savannah was a demo-project for the potential use of nuclear energy. She was deactivated in 1971, and is now located at the Canton Marine Terminal in Baltimore, Maryland.
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