Well in this case it was moreso that gas turbines technology advanced way faster than anticipated
True that...
Now for another fictional ship:
The Jormungand class Blue Water Cruiser. Two triple-barreled Long Tom turrets, two Twin-PPC/AC-10 combination turrets, a twin LRM-20 turret, a forward pair of LRT-20s, and three pairs of SRT-6 launchers in fore-sides and aft positions (and enough ammo to last quite a while for all weapons) make up its principal armament and it also includes a refrigerated cargo bay (745 ton rated capacity), a regular cargo bay (3696 ton rated capacity), a helipad, two light vehicle bays, two field kitchens, a MASH unit with eight operating theaters, and twelve tons of communications equipment.
CASE is integrated into the design in later variants.
It has a top speed of 97.2km/h (or almost 52.5 knots), has a cruising speed of 64.8km/h (or just shy of 35 knots), and is powered by a fusion engine. It is also a Trimaran design, which is quite unusual in all honesty. It's basically a blue-water cruiser designed for naval patrols, being a flagship, a mobile hospital, and fire support. Sure if a
space warship decided to say hi, it'll die, but in all honesty, by the time it was commissioned, there were no
officially combat-capable warships, and having something that would use the vast oceans of various planets would be nice to have available.
It is a rarity that you see
sensible fictional blue-water ships in fiction...