Abstract: A drive system is disclosed for increasing the total output power from a main driving and gas turbine engine combination. The subject drive system is particularly suitable for use in ships which include both a main driving engine such as a diesel or small turbine, having high efficiency at low power outputs, and a gas turbine engine, for high power outputs. In accordance with the subject invention, in order to obtain the maximum total power from both engines, the main driving engine is coupled to a compressor for supercharging air prior to its introduction into the gas turbine engine. The resulting horsepower generated by the supercharged gas turbine engine is greater than the sum of the horsepower of each individual engine.