The paper outlines the experiences which have resulted from the application of two gas turbine engines (Proteus and Gnome) to provide main propulsion in marine craft. The emphasis is on the use of these engines in the Air Cushion Vehicle (Hovercraft). Summarizing the lessons learned with the Marine Proteus powering fast displacement craft, and the development of the engine for this role, the author then relates this work to the advent of Hovercraft. The fore-running small hovercraft had been largely dependent on the Marine Gnome engine, and much of the experience with both units can be cross-related. Marine Proteus entered the hovercraft world in the larger vehicles. This experience is discussed in some detail, and is further correlated to the continuing build-up of usage of the same engine in Fast Patrol Boats and Hydrofoil Craft.

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