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Introducing the Iowa-class: The Navy’s Plan to Build the Ultimate Battleship

Iowa-class
Iowa-class battleship firing a broadside. Image Credit: Creative Commons.

The U.S. Navy’s Iowa-class Had Its Sights on Japan Before The First Ship Was Even Built – While the United States Navy’s USS Iowa (BB-61) didn’t enter service until 1943, she and her sister battleships had their sights on the Imperial Japanese Navy before construction even began. In 1936, when there was every indication suggesting that the Empire of Japan would fail to ratify the London Navy Treaty, the United States Navy began the development of a new class of “fast battleships” to succeed the South Dakota-class battleships then under construction.

Due to the failure of the treaty, battleship displacement was increased to a limit of 45,000 tons. The American planners opted to use the increased tonnage for extra power and protection rather than for increased firepower and armament, which naval officials had considered to have reached an acceptable plateau. Another consideration was a warship that would have a maximum beam that would allow it to pass through the Panama Canal – and thus be readily able to operate in both the Atlantic and Pacific Oceans.

Major War Effort

In total, it took 3,432,000 man-hours – more than 206 years of draftsman hours – to complete the final design for the Iowa-class battleships. The total completed plans reportedly weighed 175 tons, 30 inches in width, and are 1,100 miles long when laid out.

Work on what was to become the warships began in early 1938 under the direction of Adm. Thomas C. Hart, head of the General Board, which followed the Battleship Design Advisory Board’s recommendation. At 860 feet long, the length of almost three football fields, the Iowa-class was 200 feet longer than the previous South Dakota-class. That allowed for additional space to be devoted to the ship’s engine, enabling the new class to be truly fast, reaching a top speed of 32.5 knots and protecting the U.S. fast carriers.

Although the armament was not increased in terms of caliber or number, it was improved in quality. The new 50-caliber 16-inch (406mm) gun replaced the 45-caliber weapon employed in the South Dakota-class. In addition, a new turret had been designed, which also saved almost 850 tons. The new class also carried the same secondary battery of twenty 5-inch/38mm guns in ten twin turrets.

The battleships were equally well protected, with a belt of internal hull armor plates – consisting of nickel-steel – of 12.1 inches (307.3mm) tapered to 1.62 inches (41.1mm) on a 19-degree incline, while the face-plate of the turrets had 17 inches (431.8mm) of armor. Instead of bulges, the Iowa-class was provided with solid internal protection, which consisted of four substantial longitudinal bulkheads, alternate bulkheads reaching up to the armored decks running into the top and bottom of the main belt.

U.S. Steel, Bethlehem Steel, and Lukens Steel all manufactured the armor used on the Iowa-class battleships, and it was strong enough that it could have likely withstood a direct hit from an 18-inch armor-piercing shell from 18,000 yards (about 10 miles).

Six Planned, Four Built

The U.S. Navy originally called for six planned Iowa-class battleships, which were authorized in three batches of two. The first two ships, USS Iowa (BB-61) and USS New Jersey (BB-62) were authorized in Fiscal Year 1939 (FY3), and the contract was signed on July 1 1939. They were laid down in June 27 and September 16, 1940, respectively.

The next pair, which included the USS Missouri (BB-63) and USS Wisconsin (BB-64), was part of the FY41 budget – and they were ordered on June 12, 1940 and were laid down on January 6, 1941, and January 25, 1941, respectively.

Two additional ships were ordered – USS Illinois (BB-65) and USS Kentucky (BB-66) – but canceled before completion. The former’s hull remained as a parts hulk until she was broken up in 1958, while various proposals were made to complete BB-65 as a guided missile battleship. That plan was finally abandoned due to cost concerns as well as the rampant evolving missile technology, and Kentucky was sold for scrap at the end of the 1950s.

It took approximately two years, eight months to build each of the four completed Iowa-class battleships. Though some 2,800 men would serve on each of the warships during in World War II, tens of thousands of men and women worked in shifts around the clock at each of the U.S. naval yards that produced the battlewagons. More than 71,000 people were employed at the Brooklyn Navy Yard, the largest center in the navy and the largest employer in the State of New York during the war.

A Good Value?

As capital warships, they were a capital investment, costing a reported $100 million each in 1940 dollars – or around nearly $2 billion per ship today. However, to put that in perspective, the U.S. Navy’s USS Gerald R. Ford (CVN-78) aircraft carrier has been estimated to be $13.3 billion – but it is running 30 percent overestimates.

For the cost of the single carrier, the Navy could have built all six Iowa-class battleships with money to spare.

Now a Senior Editor for 1945, Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers and websites. He regularly writes about military hardware, and is the author of several books on military headgear including A Gallery of Military Headdress, which is available on Amazon.com. Peter is also a Contributing Writer for Forbes.

Written By

A Senior Editor for 1945, Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers, and websites with over 3,000 published pieces over a twenty-year career in journalism. He regularly writes about military hardware, firearms history, cybersecurity, and international affairs. Peter is also a Contributing Writer for Forbes. You can follow him on Twitter: @PeterSuciu.

2 Comments

2 Comments

  1. Andrew M. Winter

    April 6, 2022 at 12:01 pm

    Something else to consider. A battleship of almost any generation can withstand a contact detonation of an atomic bomb, and did so at Bikini Atol in, https://en.wikipedia.org/wiki/Operation_Crossroads, “Operation Crossroads”.

    The Japanese Battleship Nagato, actually one of the last early Dreadnoughts to be built, was launched in 1919.
    https://en.wikipedia.org/wiki/Japanese_battleship_Nagato#After_the_war

    She was less than one mile from the airburst of the atomic bomb being tested, which was a mark III bomb of 23 kilo tons, which was the same kind of bomb used at Nagasaki.

    The Iowa’s were, of course far better protected than a design that dated to World War ONE. So, when the United States needs to make a “statement” recommissioning these beasts is a fairly cheap way to make it.

    Now take those 16 inch guns. Run one of the newer powered artillery rounds currently available in 155mm, five inch, and 8 inch, and you could really have something here that is hugely more formidable than ever before.

  2. Edward Santillan

    April 8, 2022 at 12:19 am

    25.4 mm in an inch. So why are 5″ and 38 mm together?

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