SHP stands for shaft horsepower. It measures the power delivered to a ship's propeller shaft, rather than the final effect of the propeller working through water. The occasional phrase 'ship horsepower' is explained as a childhood shorthand, not a different engineering unit. That distinction matters when the class's roughly 60,000 SHP and 30-knot design speed appear later.
Notable Point · 1:01-2:09
What SHP means in warship specifications
Shaft horsepower is defined before the Leanders' machinery output and design speed come into the discussion.