UK National Physics Laboratory formula for penetration of RHA

[Peasant_wb]

I’ve made a spreadsheet calculator, so anyone can play with it:

Formula

Spreadsheet

Link.

Edit: Comparison with historical data:

Spoiler

Edit: I feel like, perhaps, there is some confusion in regards to what this formula is.
Probably as soon as people read “formula” they think of it as something distinct and separate from “hard” data from “real” penetration tests. But, as you can see in this snippet, the output of “formula” is very real and true to real life experimental data.

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Spoiler

[Peasant_wb]

@KillaKiwi The calculator is showing error because you put target thickness too high. This model is applicable only to plates up to 2 calibers thick.