Trade Protection Cruisers
In the early 1920s, the Royal Navy found itself with a large number of
war-weary cruisers that would face eventual block obsolesce in the
not-too-distant future. With the post-war economic and political
situation not conducive to the kind of extravagant spending known during
and before the Great War, coupled with the realities of Cleito treaty
limitations, the RN explored the possibility of producing more economic
trade protection cruisers to eventually replace it's Great War vintage
light cruisers in secondary empire roles. Key among the features
intended for the design was enclosing the main armament in a turret, and
to reduce costs, use a crew-serviceable 5.5" gun, rather than the
larger 6" guns then common in use on light cruisers, with it's lighter
crew-serviceable shells.
Diana Class
While the first three ships of this project, the 4800 ton Minerva class
were being built, a successor 5000t design with an additional turret was
also put into production. However, while the four ships of the Hector
class were still being built, the evaluation of the Minerva class proved
to be poor to the RNs tastes. The 5.5" shells, while lighter than the
6" shells, still proved too heavy and cumbersome for unassisted crew
handling for any length of time. With the shells not proving to be a
benefit onboard ship, Quartermasters also found the need to maintain a
separate ammunition stock at worldwide bases to be a not-insignificant
logistical boondoggle. With other issues stemming from their small size
and corner-cutting lack of amenities, the Minerva class was quietly
transferred to the Royal Canadian Navy not long after their
commissioning, while the four ships of the Hector class never completed
fitting out, and put into reserve for almost 20 years.
Hector Class
The three Minerva class ships performed as the core of the RCN for
several years as domestic Canadian construction took time to meet
Canadian needs, before being reduced to training roles in 1938. But as a
result of the RCN being formed with a core of 5.5" armed vessels, the
caliber took root in the Canadian logistics establishment, with newer
automation-assisted mounts being developed on other ships. With a need
to soon retired the aging Argyll class cruisers, an agreement has been
reached with the Royal Navy to transfer the Hector class to Canada to
complete fitting out and serve with the RCN until such time as modern
replacements are ready.