Component of inductance $H_2$ of 2nd armour

Second component of inductance due to second layer armour steel wires.
For steel tape armour, the length of lay $p_{a_2}$ is assumed to be equal to the mean diameter of the second armour layer $d_{a_2}$.

Symbol
$H_{2_{2}}$
Unit
H/m
Formulae
$\frac{1.0 \cdot 10^{-7} d_{f_{2}}^{2} \mu_{e} n_{a_{2}} \pi \sin{\left(\beta_{a_{2}} \right)} \sin{\left(\gamma_{a} \right)}}{d_{a_{2}} p_{a_{2}}}$
Related
$\beta_{a_{2}}$
$d_{f_{2}}$
$\gamma_{a}$
Used in
$B_{2_{2}}$