$\{\begin{array}{c}\text{:}\frac{V_T-V_a}{V_T}**100\end{array}$

$\{\begin{array}{c}\text{:}\frac{V_T-V}{V_T}**100\end{array}$

$PN$

$\frac{P}{D}$

$\frac{V-V_a}{V}**100$

Pitch $($P$)$

Pitch ratio $($p$)$

Theoretical speed of propulsion $(V_T)$

Apparent slip

Wake fraction $(w_t)$

Velocity of advance $(V_a)$

Real slip