Ram Mark II manual

[45jim]

You are creating a problem by converting from Imperial to Metric. If you are trying to determine the correct thickness of armour plate you need to remember the different methods of production and the inherent tolerance related to each. Only then can you convert. RHA (rolled homogeneous armour) has a much tighter tolerance than cast sections or face hardened plate. I believe you must select the correct source (original manuals) and then examine the relevant specification on manufacture. A common modern material MIL-A-46100 has a nice standard and is widely available and will demonstrate the methodology used in armour production and grading. It shows the variability in dimension and composition that was acceptable. Is this for wargaming?