Talk:General Discussion/@comment-195.184.83.35-20140914155536/@comment-106.160.143.172-20140918145301

Checking it again and I was actually wrong, the A-150 class does actually use 51cm guns, not an imperial measurement. It does get confusing when half of the IJN guns used imperial measurements and the other half use metric measurements, although they typically used the metric units for naming all of them. For example the 12.7cm guns are 5-inch guns, similar to the 20.3cm guns being 8-inch guns. At least the 15.2cm and 35.6cm guns have the excuse of being designed in England, being the weapons on the Kongou-class. Some of the unbuilt classes of ship the IJN designed also have this issue as the number-13 class battleships had 45.7cm (18-inch) guns, the Amagi class was planned to have 40.6cm guns (16-inch).