Randomiser wrote:I'm not an expert in naval warfare, perhaps those who are could comment, but the idea that you could replace 74 gun galleons on a one for one basis with gunboats which have exactly 5 guns total, only one of which is any longer ranged than the opposing galleon's weapons seems ludicrous.
But the problem is, that it's the right idea.
When the shell guns was invented, it became obvious, that you wouldn't need a lot of guns anymore. In 1850-1860, even before the ironclad era, the steam frigates with only one deck of shell guns practically replaced the screw ship-of-the-lines in all world fleets exept the British and French. You don't need a hundreds of shell guns to sunk a wooden warship. What you need, is a bigger shells to make more destructive effect in each hit. One big shell gun is generally better than a few small, because her shell could be much more powerfull.
Of the 74 guns of the galleon, only a guns on the lower gun deck coud be made effective shell guns. Because shell guns are heavy. Very heavy. You couldn't place them on the upper gun decks, without compromising the ships' stability. And all the guns that couldn't fire shells are useless in shell-guns era. The destructive power of solid shots is so ridiculously small in comparsion to the shells, that
there is no reason to have a lot of non-shell guns on the ships anymore.
Another consideration. With the solid shot, to make the effect, you need the shot to come through enemy sides. It could be done only at the small distance. With the shell, all you need for shell is to get INTO the enemy sides - and the detonation inside the planking is, actually, even better than inside the hull.
So, the shell guns could work effectively on the much greater distance then solid shots. I.e. with a few big shell guns you could sunk the solid-shot armed enemy without even coming into the range of his guns. This is another reason to make shell guns BIG. The gunboat with, for example, one 11-inch smoothblre Dahlgren, could wreck the galleon armed with hundred of 36-pounders without even coming into the range of galleon's guns. Her single guns threw shell, that is much heavier - and have much more kinetic energy - than 36-pounder's.
How could a 74-gun sail galleon battle the one-gun steam gunboat? The galleon's ability to aim her guns is pretty limited, and the angle of fire isn't good either. The gunboat could easily stay out of range and out of the fire angle for the galleon boardside, and methodically pound the galleon with heavy shells until it would be wrecked. And even if the galleon manage to come into the gun range of gunboat - the galleon is big, towering target, and the gunboat is small. Very small.
About "what could the gunboat do", you could read this:
https://en.wikipedia.org/wiki/CSS_Selma_(1856)
CSS "Selma" vs USS "Masssachussets" was the pretty good poin about the power of gunboat. Basically, the more agile "Selma", armed with two big rifles, just stand outside of "Masssachussets" boardside smoothbores, and give a few nasty hits. And "Masssachussets", at least, was a propeller, too!