The Type 23 frigates show why a long production run can conceal substantial internal variation. Some were built around the Sea King's landing gear, later ships were arranged for Merlin, and earlier hulls could acquire a third aft configuration after modification. A two-ship class offers a closer comparison, though different careers still show how design interacts with circumstance. Two examples also help separate a genuine design weakness from a one-off mechanical or human failure. The comparison frames the video around design, availability, and contingency.
Chapter · 9:40-14:54
Why compare sister ships?
A two-ship class makes design choices and operational differences easier to see than a large, evolving class.