The Swift achieved something like 64 SHP/ton in trials

When the British large destroyer Swift in trials, circa 1907, she produced about 50,000 SHP on a machinery weight of about 781 tons (420 tons boilers and 361 tons turbines). That comes out to about 64 SHP/ton. Admittedly, she was pressed to produce that much power, and she was so overweight that she was only good for 35 knots, maximum. I wanted to point this out, though, so that if you had concerns about high power output per ton of weight, it is not out of line.