According to ADM 281/40,ROYAL NAVY tested the Old-type cemented Armor plate from HMS Rodney.
According to archive records, the hardened layer thickness of these armor plates is maintained at around 20% (16%~23%)
as:Depth of face.
No.8203(Cammells)
Top:1.375 inch＝17%
Bottom:1.125inch＝16%
and something strange happened......
According to ADM 281/32 and USNTMJ-200E-16，It may be found that the calculation of hardened layers in the UK and Japan seems to be different:
"The depth of face" of Japanese VH type armor is about 25%~27.3% under UK standard，but is about 30%~33% under Japanese and American standard.
This may be because the hardness is greater than 300B can be counted as a hardened layer under the British standard, but under the American and Japanese standards, all parts except the back that has not been hardened at all are counted as a hardened layer.
As we all know,As a result of the alliance between Japan and Britain, Japan introduced a full set of manufacturing processes for British VC armor plates in 1910, and succeeded in manufacturing the first 320Ibs(199mm) VC armor plate in 1915.However, the hardened layer thickness of these VC armor plates is only 20%(Japanese standard) according to Japanese data. Considering the issue of technical exchange between Japan and the UK mentioned earlier, the hardened layer thickness of the "C" armor plates manufactured by the UK during World War I should also be within this range.
The Japanese Navy did not conduct a comparative test of 63mm hardened layer (20%) and 100mm hardened layer (30%) 325mm armor until 1928. In the test, the armor with a 30% plate thickness hardened layer had significantly higher bulletproof performance. Therefore, the hardened layer of surface hardened armor was subsequently set at 30-33% plate thickness.
So, compared to the armor plates produced by the British Navy during World War I, have these armor plates from HMS Rodney undergone improvements such as hardening layer thickness and composition ratio. Is its performance more similar to the armor plates of the Royal Navy during World War II, or during World War I, or maybe it is a transitional intermediate state between the two?
If the plate from HMS Rodney is a transitional intermediate state between the two?What is the performance difference between this armor plate and the performance during World War I and World War II？
When did the Royal Navy transition from armor plates manufactured during World War I to this type of armor plate, and when did it transition from this type of armor plate to the production mode of armor plates during World War II?
According to archive records, the hardened layer thickness of these armor plates is maintained at around 20% (16%~23%)
as:Depth of face.
No.8203(Cammells)
Top:1.375 inch＝17%
Bottom:1.125inch＝16%
and something strange happened......
According to ADM 281/32 and USNTMJ-200E-16，It may be found that the calculation of hardened layers in the UK and Japan seems to be different:
"The depth of face" of Japanese VH type armor is about 25%~27.3% under UK standard，but is about 30%~33% under Japanese and American standard.
This may be because the hardness is greater than 300B can be counted as a hardened layer under the British standard, but under the American and Japanese standards, all parts except the back that has not been hardened at all are counted as a hardened layer.
As we all know,As a result of the alliance between Japan and Britain, Japan introduced a full set of manufacturing processes for British VC armor plates in 1910, and succeeded in manufacturing the first 320Ibs(199mm) VC armor plate in 1915.However, the hardened layer thickness of these VC armor plates is only 20%(Japanese standard) according to Japanese data. Considering the issue of technical exchange between Japan and the UK mentioned earlier, the hardened layer thickness of the "C" armor plates manufactured by the UK during World War I should also be within this range.
The Japanese Navy did not conduct a comparative test of 63mm hardened layer (20%) and 100mm hardened layer (30%) 325mm armor until 1928. In the test, the armor with a 30% plate thickness hardened layer had significantly higher bulletproof performance. Therefore, the hardened layer of surface hardened armor was subsequently set at 30-33% plate thickness.
So, compared to the armor plates produced by the British Navy during World War I, have these armor plates from HMS Rodney undergone improvements such as hardening layer thickness and composition ratio. Is its performance more similar to the armor plates of the Royal Navy during World War II, or during World War I, or maybe it is a transitional intermediate state between the two?
If the plate from HMS Rodney is a transitional intermediate state between the two?What is the performance difference between this armor plate and the performance during World War I and World War II？
When did the Royal Navy transition from armor plates manufactured during World War I to this type of armor plate, and when did it transition from this type of armor plate to the production mode of armor plates during World War II?
statistics: Posted by HMS Monarch — 2:52 PM - 1 day ago — Replies 0 — Views 126