The Royal Navy's 4-inch, 4.5-inch, two 4.7-inch variants, proposed 5-inch gun, 5.25-inch gun, and 5.5-inch gun record repeated attempts to standardise around changing requirements. Each programme tried to reconcile dual-purpose performance with a different mix of surface fire, anti-aircraft fire, ship roles, and treaty displacement limits. Continuing 4.7-inch production was partly a consequence of the service still seeking a satisfactory replacement and mounting. The lesson is that calibre diversity can emerge from funded experimentation and changing priorities within an institution actively seeking a standard.
Notable Point · 3:25-6:59
Royal Navy gun diversity reflected changing priorities
The Royal Navy's seven medium-calibre gun paths are framed as repeated attempts to balance surface fire, anti-aircraft work, treaties, and ship displacement.