[TEX: P = \sqrt[2.035]{\frac{w \ v^2}{\pi \ g \ d \ 3852.8}}]

Col. Maitland gives

w v²
P = ------------
g d² 16654.4

[TEX: P = \frac{w \ v^2}{g \ d^2 \ 16654.4}]

Maitland's latest formula, now used in England, is

_
v /w
P = ----- \/ - - 0.14 d
608.3 d

[TEX: P = \frac{v}{608.3} \sqrt{\frac{w}{d}} - 0.14 \ d]

General Froloff, Russian army, gives

w v
P = ------
d² 576

[TEX: P = \frac{w \ v}{d^2 \ 576}]

for plates less than two and one-half inches thick, and

w v