The 40-year old Iowa class
Dammit, did a slip into one of those aforementioned alternate time lines? I could swear WW2 took place in the '40s, not the '70s.
The
Iowas were 40 years old when the
Ticonderogas entered service.
While that's true, it ignores the scope of the difference in size between a heavy cruiser and a battleship or carrier.
As I said, though, we're talking "heavy cruiser". By definition the only things after that are battleships and carriers. (And possibly a type of Battlecruiser depending on how you parse the nomenclature). Seriously, what's
left between them, or after them?
Among primary combatants, essentially* nothing is between them, but the distance that separates them is significant. It's like saying that Earth is the next biggest planet after the gas giants (if not quite to that scale); while true, the statement means much less than it seems it does.
Other ship types, though, are sometimes larger than heavy cruisers. The
Sacramento class fast combat support ship (a combination oiler, ammunition ship, and refrigerator ship), for instance, which slightly predates the
Ticonderoga class, is 242 m long and displaces 53,000 tons. Other modern auxiliaries are also rather large, such as the
Lewis and Clark class dry cargo ship, which is 210 m long and displaces 40,300 tons.
Auxiliary ships of various types actually represent the bulk of current large-displacement American ships. We have dozens, with displacements ranging from 20,000 tons to more than 50,000 tons
*Technically, battlecruisers, light carriers, and escort carriers are longer and displace more than heavy cruisers.
So if the NCC-1701 is a heavy cruiser, then what the hell would a 'surveyor' NCC-0514 that's several times its size supposed to be? This is to say nothing of an 'old cruiser' that has a diameter in one screenshot measured in miles.
The
Kelvin isn't identified as a survey ship in the film. Nor is the
Mayflower (which I don't think is nearly so large as is often suggested; its saucer is somewhat smaller than the
Enterprise's by my calculations - I could be wrong, though) identified as a cruiser. The
Mayflower may be an older design of battleship/dreadnought (whatever type the new
Enterprise represents), and the
Kelvin may be some kind of battlecruiser - or even a battleship. Or the Kelvin may fill some other role we haven't seen on Star Trek. Perhaps its a carrier, a mobile repair ship, a fleet support vessel, etc. Maybe it really is a survey ship, but is designed to survey entire planets in detail, so is quite large, carrying many shuttles, laboratories, heavy sensor platforms, etc.
