The Post-Treaty Battleships (Part 2)

By Chuck Hawks


Yamato
IJN Yamato. Imperial War Museum photograph.

As I pointed out near the beginning of this article, after their final rebuild and re-commissioning in the 1980's, the Iowa class battleships became the all time, undisputed, battleship heavyweight champions of the world. No other battleship in history even came close to the awesome firepower of the four Iowa's in their final form. Let's take a look at Wisconsin's specifications back in 1945 (again from my trusty copy of Conway's):

Displacement:

48,110t standard; 57,540t full load.

Dimensions:

860ft wl, 887ft 3in oa x 108ft 2in x 36ft 2.25in full load.

Machinery:

4-shaft Westinghouse geared turbines, 8 Babcock & Wilson boilers,
212,000shp = 32.5kts, Oil 7,621t.

Armor:

Belt 12.1in on .875in STS, lower belt 12.1in-1.6in on .875in STS, armor
deck 6in with 1.5in weather deck and .625in splinter deck, bulkheads
11.3in, barbettes 11.6in-17.3in, turrets 19.7in face, 7.5in roof, 9.5in side,
12in rear, CT 17.5in with 7.25in roof.

Armament:

9-16in/50 (3x3), 20-5in/38 DP (10x2), 80-40mm AA (20x4),
51-20mm AA (47x1, 2x2), 3 aircraft.

Complement:

1,921 designed (actually about 2,700 in 1945)

Range:

15,000nm at 15kts.

If these specifications do not exactly match what you are used to, don't fret. I have several reference books at hand, and they all vary slightly.

Jane's Fighting Ships from the war years, the 1950's, and into the 1960's credited these ships with a standard displacement of 45,000t, a rated speed of 33kts and a service speed of 35kts, and 19in to 16in belt armor. These figures were widely repeated, with variations. Whether the extreme over estimation of the Iowa's armor was simple mistake, or government misdirection dating back to the war years, I do not know.

For what appears to be the final word on all US battleship classes, I recommend the book U.S. Battleships, An Illustrated Design History by Norman Friedman. Mr. Friedman, by the way, says that the Iowa class ships never ran a measured mile in speed trials due to fear of enemy submarines. He quotes the same design speed as Conway's (and the other specs are very similar, if not identical, to Conway's figures), but says that the power plant was designed to permit up to 20% overload, that is 254,000shp, enough to drive a fully loaded ship to 33.5kts, or a light ship (51,000t) to 35.4kts.

He also states that on trials New Jersey showed fuel consumption equivalent to a range of 20,150nm at 15kts, or 4830nm at full power, far exceeding the design specification. The operational flexibility conferred by this great radius of action should not be underestimated. It is the kind of thing easily overlooked when comparing battleship guns and armor and so forth, but in the real world it may mean that battleship "A" is on station performing her mission, while the more impressive (on paper) battleship "B" is in port refueling.

As to the plusses and minuses of the Wisconsin, the extreme longevity and usefulness of the class certainly indicates that the fundamental design got it right. She was designed to be a battleship that could escort the fast carrier task forces. The wisdom and foresight of her design can not be denied. By the time Wisconsin joined the fleet, the fast carrier task force had become the final arbiter of sea power, having replaced the battle line in this role. Wisconsin and her sisters fit naturally into the new role. Their high speed, long range, and unsurpassed AA capability made them the right tool for the right job at the right time.

The superb 16in/50 gun (probably on balance the best battleship gun ever built) fired a super heavy 2700lb AP shell (the previous 16in AP shell weighed 2240lbs) at 2500fps, for a range of 42,345yds at 45 Degrees elevation.

The hull had a "bulbous" bow, to reduce drag (this increased both speed and range) The size and volume of their great hulls, plus their other sterling attributes, would make them useful to their country's Navy 40 years after the end of the war they were designed to fight. They would live to help bring down another Evil Empire.

There were some minuses, however none proved to be critical. The Iowa class proved to be wetter ships, particularly at speed, than they should have been. The very long fine bow tended to bury itself in large waves, and the sudden change to the full beam made them wet in the vicinity of the foreword turrets. They needed about six feet more beam. Their armor was insufficient to provide a decent immune zone against either the 2700lb 16in shell or the 3200lb 18.1in shell. The machinery could have been redesigned to save weight and space, and the machinery spaces further subdivided.

The torpedo-protection system was relatively unsatisfactory, a problem accentuated by the narrowness of the hull in the vicinity of number one turret and its magazine. The only solution would have been a blister, but this was estimated to slow the ship by 1.5kts, a price the General Board refused to pay. As it was, Wisconsin's torpedo protection system was only designed to resist about 680lbs of explosive, and this estimate may have been optimistic. This was probably her most serious deficiency. Fortunately, none of the Iowa class were ever torpedoed.

The light AA guns should have been placed higher to give them larger sky arcs, and some of them were in-operable in a seaway due to spray interference. The hull shape set up unusual standing waves which made the Iowa class difficult to refuel from. Berthing was cramped (given the large increase in wartime complement), and the bridge was too small. Minor complaints like these could probably be leveled at any battleship.

In a stand up gunfight against any other battleship in the world (ignoring her sisters), Wisconsin would have been expected to win. The single exception might be against one of the Japanese Yamato class (more about this later).

Late in her life, Wisconsin was reconstructed and returned to service. By this time there were no enemy battleships left, but the Soviet Union was making a bid to challenge the U.S. Navy's supremacy at sea, and in 1980 they commissioned the first of a class of four 28,000t nuclear powered guided missile battlecruisers, good for 33kts. The only ships in the world big enough and fast enough to counter these were the four Iowa class battleships, waiting patiently in reserve. The reactivation of the class started in 1981, with the New Jersey. The Iowa, Missouri, and Wisconsin followed. Their 16in guns were regarded as valuable assets, and were retained. Four twin 5in/38 mounts were removed to make way for Tomahawk missile launchers, the other six were retained. All of the lighter AA guns were removed. New systems added included: 8 armored box launchers for Tomahawk long range SSM, 4 quadruple launchers for Harpoon ASM, 4 Phalanax 20mm CIWS, improved communications (to the standard of a modern cruiser), SLQ-32V ECM gear, SPS-49 air search radar, SPS-67 sea search radar, various decoy systems, improved fire control systems, a new lattice foremast, installation of a helipad on the fantail, an improved fire-fighting system, and conversion to distillate fuel.

Her basic specifications stayed the same, but some figures changed as follows (from Jane's Fighting Ships 1989-90):

Displacement:

48,110t standard; 57,540t full load.

Speed:

35kts

Missiles:

SSM: 32 GDC Tomahawk (8 quad) launchers, 16 Harpoon (4 quad) launchers.

Guns:

9-16in/50 (3x3), 12-5in/38 (6x2), 4-20mm Phalanx (4x6).

Aircraft:

3 to 4 helicopters

Range:

5,000nm at 30kts, 15,000nm at 17kts.

Complement:

1,518

Off Lebanon the New Jersey taught the terrorists that SAM missile sites have no defence against 16in shells. And, during the Gulf War, Missouri and Wisconsin launched Tomahawk cruise missiles from the Persian Gulf against a variety of targets deep inside Iraq. Both provided fire support during operation Desert Storm (see my Hot Link to "Battleships in Desert Storm" for more details), and Wisconsin fired the last battleship salvoes (in anger) in history during that war.

It is hoped that most (maybe all) of the Iowa class battleships will eventually be preserved as memorials. As I write this, the New Jersey will probably return to her home state (see my Hot Link to the Battleship New Jersey Historical Museum Society). The Missouri is at Pearl Harbor. The final disposition of Wisconsin (see my Hot Link to USS Wisconsin - BB 64) and Iowa (follow my Hot Link to USS Iowa - BB 61 Veterans Assn.) is unknown. Both have been returned to the reserve fleet, after having been prematurely stricken by the Clinton Administration, and might be re-activated at some time in the future.

Well, gentle reader, we have finally gotten here. We have examined four great battleships, including one that I have gone out on a limb for and suggested might be the best all around, and another that I rated the final, undisputed, battleship heavyweight champion of the world. Now it is time to take a look at the big one. The most stunning, superlative, legendary capital ship of them all...Ladies and Gentlemen, I present the IJN Yamato class battleship: Musashi!

If you like the basic qualities that set battleships apart from other, lesser, surface combatants: big guns, heavy armor, and massive size--Musashi is the top banana, the big cheese, the last word, and the final solution. Forever at the top of the class.

Musashi was laid down in 1938, and completed in 1942. She was the second, and last, of the Yamato class super battleships (the third hull, Shinano, was completed as the worlds largest aircraft carrier). Yamato became the more famous of the giant pair, but from what I have read, just about everybody in the Imperial Japanese Navy considered Musashi the better ship. Whether this was because she was built in a private yard (Mitsubishi, in Nagasaki) instead of a Navy yard, or because she incorporated improvements, I am not sure. Perhaps a bit of both.

The final authority on these ships (almost the only authority) is the book The Battleship Yamato, by Janusz Skulski. I say "almost the only authority", because at the end of WW II, the Japanese systematically destroyed all information about these ships, even all of the photographs they could lay their hands on. For years they remained mystery ships, with little hard information available about them. After the end of the war, the U.S. Navy convened a board of inquiry to learn what they could about the Japanese giants. Some of the data following doubtless originated from that source. Even Mr. Skulski's book deals only with the visible, external features of the ship, which he painstakingly researched down to the smallest detail. I have taken the following specifications from The Encyclopedia of the World's Warships, with additional material from Conway's and The Battleship Yamato as required:

Displacement:

65,000t standard; 72,809t full load.

Dimensions:

800ft 6in pp, 839ft 11in wl, 862ft 9in oa x 121ft 1in wl, 127ft 6in max
x 34ft 1in.

Machinery:

4-shaft geared turbines, 12 Kanpon boilers, 150,000shp = 27kts (27.46kts on trials
at 69,100t), Oil 6,400t.

Armor:

Belt 3in-16.1in, deck 9.1in-7.9in, turrets 7.5in-25.5in, barbettes
15in-22in, secondary turrets 2in, CT 19.7in-11.8in.

Armament:

9-18.1in/45 (3x3), 6-6.1in/55, 24-5in/40 DP (12x2), 130-25mm AA, 7 aircraft.

Complement:

2,500 (approximate)

Range:

6,054nm at 16kts.

If the specifications you have do not exactly match these, you are not alone. I have five reference books on my table as I write this, and none of them match 100%. The above figures are as close as I can make them. Except for the Armament category, by the way, they really refer to Musashi's sister ship Yamato. I have never seen a spec sheet that refers specifically to Musashi. Hopefully, the two ships were nearly identical in their basic specs.

Some further notes are in order here. The deck armor was designed to give protection from a 2,000lb bomb dropped from 15,000ft. Protection against shellfire was designed to give an immune zone against 18in shells between 22,000 and 33,000yds. There was a 7.9in-3in longitudinal torpedo bulkhead below the main belt, this went completely under the magazines. The main belt was inclined at 20 degrees to increase its effectiveness, and the torpedo bulkhead was inclined at 14 degrees. The underwater protection system was designed to withstand an 880lb charge. The connection between the main belt and the torpedo bulkhead was weak, however, and the underwater protection system failed to live up to expectations, a familiar refrain in the history of battleship design. It took about 10 torpedoes and 6 heavy bombs to sink Yamato (off Okinawa, 7 April 1945), and up to 19 torpedoes and 17 bombs to sink Musashi (during the battle of Leyte Gulf, 24 October 1944). Judging by those extraordinary totals of ordinance, I think it is fair to conclude that the protection systems actually performed pretty well. Both Japanese giants were sunk entirely by aircraft from U.S. aircraft carriers.

The main battery 18.1in guns fired a 3200lb AP shell a distance of 45,960yds at 45 degrees of elevation. The shells themselves, by the way, had a very long fuse delay and were disappointing in service. They tended to pass through the target before exploding. Like with the German 15in shells, this was not a fault of the ship, and could have been easily rectified.

Her optical rangefinders for main battery control had a base length of 15 meters, which when coupled to the outstanding quality of the optics, gave her by far the worlds best system for precise fire control (excluding radar systems).

Her hull had a "bulbous" bow, which reduced hull resistance by 8.2% at 27kts. Her deck had a "wave shape" designed to ease stress, clearly visible in pictures. Her unmistakable superstructure and tower bridge with its 15 meter rangefinder on top was plated with 20mm armor to protect against "strafing" by enemy aircraft.

The total weight of her armor was 22,895t, more than on any previous (or subsequent) ship. It is a record which is not likely to be broken.

Musashi and Yamato were incredibly maneuverable, their tactical diameter (turning circle) was only 640 meters. For comparison, Vanguard's tactical diameter was 1025 yards, and Wisconsin's (also considered an extremely maneuverable battleship) 814 yards. I have never read any particular comment about Musashi's sea keeping qualities, but such a large ship with such a great beam almost had to be a steady gun platform.

If you notice in the specifications, Musashi carried plenty of oil, but had a fairly limited range. She must have been a terrible fuel hog, even worse than Jean Bart.

The ships extreme size was the result of Japanese determination to build battleships that the U.S. could not match and still pass through the Panama Canal (which has locks 110ft wide). In fact, when the Montana class was being designed (121ft beam), it was also planned to build new, wider, locks for the canal. Both projects were canceled during the war.

As I have said, Yamato and Musashi were intended to defeat U.S. battleships in a showdown for supremacy at sea. They were to overwhelm the smaller American battleships with their big guns, protected by the heaviest armor afloat. It is a moot question whether they could have done this against an Iowa class adversary, as the aircraft carrier became the principle arbiter of sea power before either were commissioned, a development ushered in by the Japanese attack on Pearl Harbor. Up until that time, American plans were indeed to send a fleet of battleships across the sea to confront the Japanese battle fleet. I think that would have been a long, bloody, voyage with a very uncertain ending.

As to Musashi vs Wisconsin in a gun battle: if only optical fire control was permitted (doing it the old fashioned way, like Hood vs Bismarck), I think that if they both survived the initial, very long range, phase of the battle, Musashi's bigger guns, heavier armor, and greater displacement would begin to tell as the range closed and the battle wore on.

Our one chance to find out just how good one of the Japanese giants would have been in a gunfight (although it would have been a case of Yamato, light cruiser Yahagi, and eight destroyers against the whole U.S. battle line) went by the board when Admiral Spruance, given the chance to engage the Yamato force off Okinawa with his battleships, signaled to Admiral Mitscher "you take them" (meaning with air power). Evidently the finest fighting Admiral in the U.S. Navy had plenty of respect for Yamato's surface fighting capability.

Admiral Spruance, of course, made the right decision. Sinking Yamato, Yahagi, and several destroyers cost the U.S.N. just 12 aircraft. Spruance's job wasn't to play fair, it was to win. And he did, putting an exclamation point at the end of the era of battleship supremacy at sea. An era which began to end in December of 1941 with the sinking of the U.S. battleships at Pearl Harbor, and a few days later HMS Repulse and HMS Prince of Wales off Singapore, was finally put to rest when the Yamato went down off Okinawa.

Return to Part 1.



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