Maximum battleship



The "Maximum Battleships", also known as the "Tillman Battleships", were a series of World War I-era design studies for extremely large battleships, prepared in late 1916 and early 1917 upon the order of Senator "Pitchfork" Benjamin Tillman by the Bureau of Construction and Repair (C&R) of the United States Navy. They helped influence design work on the Pennsylvania-class battleship and first South Dakota classes of battleships. The plans prepared for the senator were preserved by C&R in the first of its "Spring Styles" books, where it kept various warship designs conceptualized between 1911 and 1925. “Maximum battleships” referred to the largest-possible battleships the U.S. Navy could afford to construct and field while still being able to utilize the Panama Canal.



Context
During the years leading up to World War I, some members of the U.S. Congress were growing frustrated with what they perceived to be chronic overspending by the U.S. Navy on battleships.

The only limits on the potential size of an American battleship were the dimensions of the locks of the Panama Canal. The locks measure roughly 1000 x, and so the "maximum battleships" were 975 x. The Panamax draft limit during the designing of these battleships was 39 ft, however the Department of the Navy required that all designs be limited to only 34 ft in draft.

Designs
Tillman's first request for designs of so-called "maximum battleship" in 1912–1913 led to several estimates for battleships unconstrained by cost. Created by the US Navy Bureau of Construction and Repair (C&R), these ships would displace up to 38000 LT and carry 14 inch guns. Although C&R was "appalled," in the words of naval historian Norman Friedman, by the extravagance of these designs, they admitted that far larger warships could transit the Panama Canal's locks, which, due to the US's geography, were often held to be the final limiting factor on the size of a US warship. Such larger designs would be often and seriously proposed within only a few years.

In 1916, Tillman repeated his request, and C&R produced another series of design studies. C&R drew up four blueprints, all ships having varying characteristics despite being built on the same hull: • Tillman I - Armed with 12 16-inch guns in four superfiring triple turrets (two at the bow, two at the stern), with a considerable 18-inch thick armor belt and a speed of 26.5 knots.

• Tillman II - Armed with 24 16-inch guns in four superfiring turrets in the same layout as "Tillman I", but with 6 guns in each turret. Her speed was kept the same so the weight for the additional guns was gained by reducing the thickness of the armor belt.

• Tillman III - A return to the armament of "Tillman I", with the reduced armor of "Tillman II" and an increased speed of 30 knots on displacement of 63,500 tons.

• Tillman IV - Using the sextuple turrets and layout of "Tillman II", Tillman IV retained the 18-inch belt of "Tillman I" in exchange for dropping speed to 25.2 knots, all with an increase in displacement to 80,000 tons.

• Tillman IV-1 - One of the two sub-designs that came out of refinement of Tillman IV. Armed instead with 13 18-inch guns in five twin and one triple turret. It dropped the 18-inch belt to an 16-inch belt. It kept the same displacement as Tillman IV.

• Tillman IV-2 - The second of the two sub-designs that came out of refinement of Tillman IV. Armed instead with 15 18-inch guns in five triple turrets. It kept the 16-inch belt of IV-1. It also kept the same displacement as Tillman IV.

Comparisons to other US Navy battleships
The Tillman designs all included five casemate guns mounted aft, two on each side and one at the tip of the stern. Similar "stern chasers" had been previously mounted in Nevada, but were omitted from the Pennsylvania-class battleship. These casemates were a return to an older design idea; American battleship designers had abandoned hull-mounted casemates after the New Mexico-class battleship. They had transpired to be too "wet" – heavy seas rendered them unusable—and they had been removed from all earlier classes.



Fate of the designed battleships
The Washington Naval Treaty of 1922 limited naval armaments, causing the cancellation of the South Dakotas and halting all consideration of the "maximum battleships."