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Comment Policy: Be nice to one another, don't go into politics (except defense policy, where appropriate), and try to stay vaguely on topic. Also, Iowa is the best battleship ever built. If you want to speculate about a ship being better than one of her sisters, that's allowed.

As battleship construction resumed in the late 1930s, designers were faced with an array of challenges that had only been on the drawing board when battleships were last built. These significantly changed the nature of the protection game, although they resembled the All-or-Nothing schemes of the last WWI-era battleships. Iowa's armor scheme was developed to meet these challenges, and examining it will show how they were met.

Iowas armor scheme. See here for larger version without labels, or alternate here.

Iowa’s belt is 12.1” of US Class A armor¹ on 30 lb STS,² sloped at 19 degrees inboard.³ This slope makes it lighter than a vertical belt would be for the same immune zone,⁴ but requires the belt to be mounted inside the hull. This means that the damaged waterline of the ship is somewhat narrower than the undamaged waterline, compromising damaged stability. This tradeoff was forced by the treaty limits and the need to get through the Panama Canal, and the next class, the never-built Montanas, would have reverted to an external belt. To enhance the belt, the outer hull plating near the belt was 60 lb STS, an amount that should be sufficient to remove the AP caps from any shells, increasing the resistance of the belt by 30% or more and protecting the waterline from splinter damage.

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The terminology of ships during the first half of the 20th century is rather confusing, so to explain things, I've put together a pair of glossaries, one for each of the world wars. Each entry will give a sketch of the kind of ship you’d be likely to find under each description. These are not intended to be completely comprehensive, as I just don’t have time. I’m sure my nitpickers valued commenters will be able to come up with all of the cases I missed. I've also written a similar guide to contemporary ships.

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Today marks two months of regular Naval Gazing here. I bring this up because it seemed an appropriate point to ask again for thoughts on upcoming topics. I asked in early November, and got some good feedback, but it's been a while and my direction is taking more shape. So here is my existing topic list. Vote for what you want, or suggest things that aren't on it:

• Updates/expansion on the basic technical posts (weapons/engineering/etc.)
• More on design history⁵
• More early battleship battles
• More on WWI⁶
• More on WWII, either battleships or other matters
• Leyte Gulf
• Amphibious Warfare
• More on Net-centric warafare
• So you want to build a battleship - design, construction, finance, operations, disposal
• Torpedoes
• More on fire control and gunnery
• The USS Missouri on Thimble Shoal
• Mothballing
• Jackie Fisher
• The Falklands (War, or the Battle of the Falklands, I guess)
• Naval auxiliaries
• I have permission from Iowa's tour lead to repost some of his sea stories that he wrote up for the tour guides
• Ship control
• Merchant sailors in WWII/Operation Pedestal
• Never-realized design concepts of various powers
• More on modern naval warfare⁷
• Histories of specific battleships. I expect to start with the other Iowas, but would then move on to other ships with interesting/well-documented histories.
• Repairing a warship
• Analysis of ideal battleship armor schemes⁸
• Anti-submarine warfare
• Dry docks
• Battleship tactics

Again, even if you don't normally comment, or think the idea you have is probably stupid, please post it. I've gotten some really good ideas from people who almost never comment. I can only promise I'll do my best to get around to things voted for some day, but I do take it into account when deciding what to do.

Also, does anyone have ideas for how to make good maps relatively easily? I do want to revise the Jutland series, but the mapping is going to be a pain. Read more...

Dreadnought's armor scheme was surprisingly close to that of her immediate pre-dreadnought predecessors of the Lord Nelson class, and was in fact the only area where no great advance was made. This was partially because a major increase in protection would have been prohibitively costly, and partially because the Lord Nelsons themselves marked a significant improvement in armor, as the abolition of the 6" battery allowed much of the side armor, designed to protect the QF guns, to be eliminated.

Dreadnought's armor scheme (above) and a section view (below).

Due to the increasing power of guns, the area over which designers could provide adequate armor to keep shells out entirely was decreasing. It was concentrated in a thick lower belt near the waterline (11"/279 mm on Dreadnought), to stop shells from holing the ship in areas where adequate compartmentalization could not be provided, such as engines and magazines. To keep shells from going over the top of this belt, naval architects would provide a thinner upper belt (here 8"/203 mm), which would keep out light shells and set off heavy ones. The splinters from the heavy shells would be kept out of the vitals by an armored deck (1.75"/43 mm). Often, the edges of the armored deck were sloped down to meet the bottom of the belt, reinforcing it in case of penetration. Sometimes, an upper splinter deck was placed over the top of the upper belt, in case the ship took hits at long range, or when rolling enough to make the main armored deck vulnerable. Read more...

Armor penetration is a phenomenally complex issue, and one that isn’t wholly understood even today. But a basic explanation is necessary to understand why warship armor was designed the way it was during the dreadnought era.⁹ The basic factors that drive armor penetration can be roughly broken down into the armor, the shell, and how they meet. We’ll start with the last of these.

“How the armor and shell meet” boils down to impact velocity and obliquity, or angle of impact. A higher striking velocity is always going to result in higher penetration, all else equal. Obliquity is measured between the axis of the shell and the line normal (perpendicular) to the plate, so 0 obliquity is a direct hit and 80 degrees is a very glancing blow indeed. Oblique impacts have less penetration than direct ones, sometimes significantly so. This is not simply due to the geometry of the impact sending the shell through more metal, despite what most works that discuss armor penetration would have you believe. The front of the shell hits first, and the contact tends to make it rotate, either glancing off or hitting the armor side-first. This is obviously tremendously less efficient than a direct hit, and the usual counter was to design the projectile to dig in to the armor slightly, which would actually reverse this process. A shell hitting and piercing at high obliquity would come out with a lower obliquity than it went in at.¹⁰

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Besides the major naval powers, quite a few other countries bought or tried to buy dreadnoughts. Last time I discussed those built as part of the South American Dreadnought race. This time, we'll look at the Ottoman, Spanish, Austro-Hungarian, Greek, and Dutch battleships.

HMS Erin with a kite balloon for spotting

The Ottomans attempted to buy two battleships in the years before World War I. One of them, Sultân Osmân-ı Evvel, began life as the Brazilian Rio de Janeiro, and was discussed last time, while the other, Reşadiye, was ordered by the Ottomans directly, and armed with 10 13.5” guns. The design was similar to the British Iron Duke, although somewhat lighter.¹¹ Like Sultân Osmân-ı Evvel, Reşadiye was seized by the British shortly after she was completed, for fear they would turn her over to the Germans. The ship, commissioned as HMS Erin, served at Jutland, where she fired a grand total of 6 rounds from her 6” secondary battery. Contrary to the experience of Agincourt, she was very cramped.¹² After the war, Erin was scrapped under the Washington Naval Treaty.

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Armoring a warship doesn’t seem like it should be hard. Figure out how much armor you need to stop what you expect to be shooting at you, and then slap that much on.

Dents on the turret of a Monitor after seeing action

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While Huascar was fighting the Esmeralda, another action was taking place off off Iquique. Another Peruvian ironclad, Independencia, had come with her, and had gone in pursuit of the Chilean Covadonga. This fight was, if anything, even more uneven than Huascar’s. Independencia was five times Covadonga’s size, armored, and three times faster.

Independencia

Covadonga’s captain, Carlos Condell, handled her with skill equal to Prat’s. He stayed close inshore, using the fact that Covadonga drew considerably less water than Independencia to avoid the Peruvian ship. The fact that his gunnery was as good as Independenica’s was bad helped, too. Independencia tried to ram twice, both times taking careful soundings on the way in and aborting when the water grew too shallow. A third attempt occurred near Punta Gruesa, where Covadonga barely avoided grounding. Independenica’s helmsman was killed by a sharpshooter just as she touched the reef, and she ran hard aground. Covadonga rounded and poured fire into Independenica’s stern, setting her on fire. Read more...

Most of the attention given to the dreadnoughts focuses on those of the major powers, Britain, the US, Germany, and Japan, with lesser attention on those of France, Italy, and Russia. But this is not the full story of the big-gun warship. Several smaller nations also bought them before World War I. The most prominent of these ships are those involved in the South American Dreadnought Race.

Minas Geraes in 1910, shortly after delivery

In 1907, flush with cash from a boom in rubber and coffee, and attempting to assert itself as a world power, Brazil ordered a pair of ships from British yards. These ships, the Minas Geraes class, were briefly the most powerful battleships in the world. Each ship had 12 12" guns, and a 10-gun broadside thanks to the unusual combination of wing and superfiring turrets. In response, Argentina and Chile both rushed to order dreadnoughts of their own.

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