Effective length per unit lay length of 1st armour

For concentric wires or straps, touching, or tapes with overlap, or two or more layers of tapes in contact with each other, the effective length is limited to 2.

Symbol
$F_{a_{1}}$
Unit
mm
Formulae
$\frac{\sqrt{d_{a_{1}}^{2} \pi^{2} + p_{a_{1}}^{2}}}{p_{a_{1}}}$default
$\operatorname{Min}{\left(2,\frac{\sqrt{d_{a_{1}}^{2} \pi^{2} + p_{a_{1}}^{2}}}{p_{a_{1}}} \right)}$for concentric wires or straps, touching, or tapes with overlap
$1$for TECK
Related
$d_{a_{1}}$
Used in
$R_{A_{1}}$