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The Scott-Still marine oil engine was built by Scotts Shipbuilding and Engineering Co based on the principles of the engine designed by William Joseph Still under licence. Much of the design work was undertaken by Scott's engineers. The diesel operated on a two-stroke cycle.
1924 First trials involved fitting 2 engine in the Dolius built for Alfred Holt and Co (Blue Funnel Line). In these trials the cylinders operated under combined internal combustion and steam power, with the latter acting on the lower part of the pistons and the former on the upper. Although efficient, there were technical problems due to oil entering the steam system and due to leakage when the cooling system operated at full boiler pressure.
1928 The engines fitted in the Eurybates employed five diesel cylinders and two separate steam cylinders. As a means of improving efficiency the Still concept was useful, but by the mid-1920s normal diesel efficiency had improved so much that the complexity of the design was not justified. Scott developed the diesel part of the engine and fitted engines in three ships, but there was no attempt to licence the design. As Scott had an extensive warship order book, no further diesels were built.