The two principal fuels used by the Navy are Navy special boiler fuel oil and marine diesel fuel oil. These two fuels, one for high-pressure steam plants and one for high-duty diesel engines, supply the energy to propel practically all Navy ships and boats. At maximum efficiency, these plants can recover from 30 to 40 per cent of the energy input as shaft horsepower. Contrasted to this, a gas turbine can only recover up to about 25 per cent of the fuel energy. Therefore why would the Navy have an interest in a power plant which can recover such a small percentage of the Btu input? The answer is given in the paper.

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