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

Symbol
$\beta_{\mathrm{a_{\mathrm{1}}}}$
Unit
$\operatorname{atan}{\left (\frac{d_{\mathrm{a_{\mathrm{1}}}} \pi}{p_{\mathrm{a_{\mathrm{1}}}}} \right )}$
$\beta_{\mathrm{a_{\mathrm{2}}}}$
$d_{\mathrm{a_{\mathrm{1}}}}$
$p_{\mathrm{a_{\mathrm{1}}}}$
$\pi$
$H_{\mathrm{1}}$
$H_{\mathrm{2}}$
$H_{\mathrm{3}}$