Timo,One need not analyze a fleet merely in terms of the ships extant in it. A nation doesn't necessarily declare its best ship "battleship" if it's just a gunboat in comparison with the neighboring nation's best ships. Also, an upstart or underdog may wish to exaggerate the significance of its warships, or then belittle it, for strategic reasons.
Quite possibly the early Starfleet did the early USN thing and decided that it would be politically (and not just economically or strategically) wise to only have a cruiser fleet (with cruisers as the de facto capital ships) rather than start building a battleship fleet.
That the hero ship of the TOS movies is a cruiser of some sort is an onscreen fact. Whether this is a "demotion" from former "higher" status is a possibility perhaps worth exploring. Possibly "battleship" was replaced in Starfleet terminology by the politically more palatable "starship" at some point, and NCC-1701 used to be that originally, while lesser vessels of the era were considered cruisers. But possibly a series of bigger or stronger ships was introduced by the 2270s (say, the oft-mentioned dreadnoughts), making NCC-1701 a "mere" cruiser in the new reality.
Frigates could be ships with only a primary hull.
This doesn't hold true for the only canonically known frigate, the New Orleans...
Perhaps one might argue that frigates are ships that carry external (weapons) modules to achieve what cruisers manage without modules? That would nicely embrace both Miranda and New Orleans in the frigate category if one so desires.
Timo Saloniemi
And let's not forget the Roddenberry TMP-novelization passage, which further muddies the waters.
When you get right down to it, there really is not that much difference between descriptive terms like "heavy cruiser", "battlecruiser", "battleship" and "dreadnought" anyway. They all describe extra-big, extra-powerful, extra-well-armed/armored ships of the line that can go fast.
There used to be fairly distinct differences between those types of ships.
Maybe something similar happened in TOS era and TNG era.
Cruisers were of a certain tonnage and generally carried 8" guns. Heavy cruisers were, well, heavier.
Perhaps it would help to understand where the term "Cruiser" came from to start with?
Cruiser - literally means a ship that cruises. The term 'cruising' in Naval terms used to mean a long-range independant mission. Many different classifications of wooden ships could be assigned a 'cruise' mission including - most famously - Frigates.
After the introduction of steam power, and then iron and steel construction, the term 'Frigate' fell out of use and was replaced by the new classification 'Cruiser' to describe the type of ships that evolved from the old wooden Frigates.
Cruisers could be used for the classic cruising missions - be it a peaceful patrol of foreign ports, 'showing the flag' or hunting down a enemy ship in distant waters. Cruisers could also be used as the centerpiece of a small battlegroup or a screening ship for a large fleet.
More than likely - the primary difference would be their intended missions.
A 'Cruiser' might be meant to run longer deep space missions, further from resupply. That would mean such a ship would need a greater proportion of interior space for supplies, crew comforts etc.
A 'Frigate' might be meant for shorter missions and maybe more defense focused. As such, a larger proportion of space could be given over to weapons and defense systems, OR the ship could be a bit smaller and cheaper (whatever that means in the future).
So, in a way, it does fit. The nature of the Frigate as we know it now could have changed yet again...
We use essential cookies to make this site work, and optional cookies to enhance your experience.