of 22.5 knots (a record at the time), and at the expense of the stern torpedo tubes, two vertical four-stroke blast-injection ten-cylinder diesels, developing a total power of 8000 bhp at 400 rev/min, were installed. Using two auxiliary generators, driven by two Ricardo sleeve-valve engines, these engines could be supercharged to give a total of 10 000 bhp.
The machinery was of Admiralty design and, when built, weighed 347 tons - 33 tons less than allowed for in the legend weights. Without this saving the Thames Class might have had serious stability problems. When first constructed, Thames, when surfacing, experienced heavy listing due to a water build-up in the main tanks on one side. The position of the flooding holes was modified to remedy this trouble. In addition, her large superstructure meant that Thames rolled heavily when
