I found a primary source related to the construction of Yamato, so I would like to share it.
This document describes the installation work of the sloped deck armor near the No. 2 main turret.
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“一号艦工事記録 Construction Record of Ship No. 1 (Code Name for Battleship Yamato): Armor Installation Work” Issued by the Hull Factory, Shipbuilding Department, Kure Naval Arsenal. September 1941. Captured Japanese Ships’ Plans and Design Data, 1932-1945 R06. Frame Number 184, 327
https://dl.ndl.go.jp/en/pid/14054473/1/327
Based on measurements taken from the drawings, the angle of the armor slope is approximately 15 degrees.
When estimating the thickness of the sloped armor using the standard 200 mm thickness of the flat deck as a reference, it measures approximately 300 mm. This is close to the 320 mm thickness that I have been asserting.
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This diagram is very inaccurate in terms of the dimensions. If you overlap different perspectives you will find them not even matched with themselves:
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And this “90deg”:
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Regarding this particular slope, I have already seen 4 different versions of inclination angles from different drawings:
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19deg:
15deg:
9deg:
7deg:
With all these inconsistencies it’s hard for me to trust these drawings by measuring their dimensions because they all contradict with each other, sometimes even with themselves.
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You’re absolutely right, and I appreciate your point. Rather than roughly measuring values from drawings, it is certainly best to reference specific figures from published sources whenever possible.
Based on two books I consulted, I believe the thickness of the sloped armor near the No. 2 turret is 320 mm. Would this be considered an acceptable claim and source from the perspective of the Technical Moderator Team?
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The angle of Yamato’s sloped armor is incorrect.
I also have a question. I reported that the angle of the 230 mm armor on the side of the Yamato is 77°, meaning it is mounted at an angle of 13°, but the manager said that the developers had previously rejected a report with the same content. (The manager responded to me politely, which I appreciated.) I think it is beyond doubt that the angle should be 83°, or 7°.
I believe the angle of the side of the second turret is 82° or 81°, but even so, the overall slope is too steep. Could it be that the 7° slope is only in one section, which I am unaware of? Or is it because the developers are expecting to receive official drawings from DMM, so the report is unnecessary? I would like to hear your opinions.
13°!?
7°
everywhere(except No.2 turret...)
I just figured out how to use the document storage feature for the first time. Sorry for being hard to read before.
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I also found a distribution diagram of horizontal armor that I had never seen before in Mr. Janus’s drawings. I seem to have poor spatial awareness, as I cannot imagine what shape it would take.
230mm
