I don't know where this might have been discussed before, I couldn't find it. But it's bothered me that the known lables for ships in the FSverse are limited to Cruiser, Corvette, and Destroyer (not to mention juggernaught or super destroyer).
Not only is there a lack of other lables, but the existing ones don't seem to fit. To steal from
Dr. Saxton:
gunboat
a small vessel of shallow draught and with relatively heavy guns. [Oxford]
monitor
a heavily armed warship of shallow draught. [Oxford]
corvette
a small, lightly armed, fast vessel, used mostly for convoy escort, ranging between a destroyer and a gunboat in size. [Macquarie]
frigate
a naval escort vessel between a corvette and a destroyer in size. [Oxford]
destroyer
a fast warship with guns and torpedoes used to protect other ships. [Oxford]
cruiser
a warship of high speed and medium armament. [Oxford]
battlecruiser
a warship of maximum speed and fire power, but with lighter armour than a battleship. [Macquarie]
battleship
a warship with the heaviest armour and the largest guns. [Oxford]
Please correct me if I'm wrong, but it looks sort of like the situation is this:
FS1:
The oldest ship class in the GTA navy is the Fenris Cruiser. At one time, it was the epitome of a cruiser, a fast ship that could pack a punch. the Leviathan varient was apparently developed for the V-T war, and was also called a cruiser because it was simply a varient on the existing design. The Orion class was developed with a new scale in mind, where a fleet would be composed of vessels so large that the Colossus would be considered only fairly large. With a ship that big, including some fighters wouldn't be a problem, and might be good for anti-bomber defense. The resulting ship design was so large and powerful, and the present resources of the GTA so limited relative to the production of a super-sized fleet, that it was adapted to serve in a carrier role, thus creating a sort of battleship/carrier when it was clear that the Fenris-scale would have to suffice (war had begun, and for real, current war, you need a lot of ships with proven designs, not some new concept model). For some reason the original designation of destroyer was kept when the design went into production.
FS2:
So now you have this bizzaro fleet left over from a major war, and you need to gun up just incase the Shivans come back. Now is not the time to go and restructure things. By bizzaro, I mean you've got destroyers larger than cruisers serving as carriers, and your cruisers have gotten pretty useless, possibly useful as anti-fighter frigates. Everything's upgraded with beam cannons. The Aeolus Crusier is created as a replacement for the Fenris and Leviathan, but is called a cruiser because by this point the names would have lost their original meaning for all practical purposes, and the ship is designed to fit in with the bizzaro fleet as it is now. Meanwhile, the super-sized ship idea is brought back, and the Deimos is called a Corvette such that it makes sense size-wise with the destroyers. The Hecate Destroyer is designed with the same idea as the Orion, with a fairly large armament and a fighter complement that is sufficient but small relative to its size. Concepts for a new fleet are outlined, but the prototype vessel to serve as a Cruiser or Battleship in this new navy isn't completed in time for this new war, and ends up being nothing more than a poorly deployed, underwhelming supership.