The US considered using 18" guns on the Montana class - but decided to stick with the 16" 50 caliber guns used on the Iowa class. They didn't gain much in range or accuracy with the 18" gun (that they designed) and the broadside weight with only 8 18" guns (4 turrents of 2 guns) was lighter than the broadside weight of 12 16" guns (4 turrents of 3 guns).
Since they knew this they must have built one or two 18" guns for testing.
The Japanese battleships with 18" guns had a slight range advantage over the 16 50s of the Iowa class - but they couldn't utilize the extra range because they had no means for optical aiming over the horizon - the Iowa class could aim using their radar that was mounted on the highest point of the ship making shots over the horizon possible.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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