Typical Firetube Boiler

The Steam Engine is double acting and directly coupled to the propeller shaft ( no gear box or clutch ). When manoeuvring, the engineer on watch must stop the engine, select the right valve timing and start the engine again.

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SS Master’s Triple Expansion Double Acting unit was built in 1916 by William Beardmore’s Speedwell Iron Works Co. in Coatbridge, Scotland. It was built for the Royal Navy for installion in a First World War Minesweeper that was ordered but never completed. The diameter of the cylinders are as follows; High Pressure (HP) 9.625″, Intermediate Pressure (IP) 15.5″, and Low Pressure (LP) 26″. The stroke is 18 inches and the indicated horsepower is 332.