Comments by "Steve Valley" (@stevevalley7835) on "The Drydock - Episode 306" video.
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wrt the USN building 16" armed battleships, the "more smaller guns vs fewer bigger guns" argument raged for some time in the Navy Department. Head of BuOrd, Joseph Strauss was the main driver of the "more smaller guns" school. When Jutland demonstrated the need for being able to penetrate at greater range, Strauss was overruled by the SecNav and General Board. In his 1916 annual report, SecNav Daniels said the decision to go to 16" was made over the objections of some officers.
When the decision to go to 16" was made in the summer of 1916, there was speculation in the press about the New Mexicos and Tennessees being upgunned to 16" during construction. A Navy spokesman said that the cost to make the changes would be prohibitive. The article did not make clear if the Navy spokesman was talking specifically about the New Mexicos, which had been laid down the previous year, or the Tennessees, as well, which had not yet been laid down.
The 14"/50 was ordered into production, off the drawing board, with no test program. Having taken that shortcut, the first production 14"/50 was test fired at about the same time as the prototype 16". Strauss' 1915 report speaks glowingly, at length, of the virtues of the 14", and briefly mentions the 16". If the 14"/50 had been subjected to an in depth test program, the dispersion issue that dogged these guns may have been discovered before production started.
Given the timelines of events, I think the most probable situation would be the New Mexicos built with 14" and Tennessees built with 16". The two Tennessees, and three Colorados, would give the USN 5 16" armed "post-Jutland" ships.
At the same time, the Japanese could argue they were entitled to a 42,000 ton ship, because of Hood, and complete Tosa, as well as Nagato and Mutsu.
So, then the RN is allowed to build four new ships, so that, combined with Hood, the RN has parity with the USN at 5, and the IJN has 3.
5