Angle between armour and cable axis

Angle between axis of first layer armour wire and axis of cable.

Symbol
$\beta_{a_{1}}$
Unit
rad
Formulae
$\operatorname{atan}{\left(\frac{d_{a_{1}} \pi}{p_{a_{1}}} \right)}$
Related
$\beta_{a_{2}}$
Used in
$H_{1_{1}}$