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Peter, you get all the fun! <br /> <br />According to John Jordan, "Modern U.S. Navy," USN Spruance class destroyers and Ticonderoga class cruisers (which have the same hull and propulsion) generally trail one of their two shafts at cruise speed in the interests of fuel economy. These are 2-shaft COCAG ships with four LM2500 gas turbines. All recent USN frigates are single-shaft; the Perry class with two LM2500 gas turbines and the earlier Knox, Garcia and Bronstein class with steam plants.
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