As a clever reader might deduce from the name NavWeaps.com, the site provides information on Naval Weapons, mostly from the classical 20th Century age of battleship warfare, but with an objective to cover the period from 1880-present.
Extensive technical information resides here: not only on naval guns from AA popguns to ship-shredding 18-inchers, but also on torpedoes, mines, depth charges, rockets and hybrid weapons.
While a lot of sites discuss the main armament of American, British and Japanese capital ships, few go deep into the secondary and tertiary armament of these vessels, and fewer still review the armaments of smaller combatant vessels, or any vessel of secondary seafaring nations, such as Russia, Italy or Austria-Hungary. This site doesn’t get every single gun on every single vessel… yet. But it does seem like that’s their ambition.
Looking at the rise and fall of great guns through history, it’s interesting to see how gun caliber, range, throw weight, and power rose from the dawn of the Dreadnought Era to peak in the great battleships of World War II … and has declined ever since. US Navy ships now have nothing greater than 155mm (approx. 6″) on the Zumwalt class, and 5″ guns on most cruisers and destroyers. (And the ammunition for the 155 is not being procured; the Navy instead wants to convert the Zumwalts to fire the ground forces’ 155mm guided Excalibur rounds, but their first cut at the costs for doing that is $250 million for the engineering, before buying the first bullet — and, of course, before the Pentagon’s usual cost overruns.
The “big gun” on the all-but-defenseless LCS class is a 57mm (~2.3″), also selected for Coast Guard cutters. So if the Navy that Ray Mabus built gets in a war with the Coast Guard, they’ll be at technological parity, at least.
But that was a long and bitter digression, and this post is really about NavWeaps.com. Along with the already-mentioned weapons information, there are some excellent historical articles on some aspect of naval warfare: for example, this one on German radar development.