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Slip Ratio - Coggle Diagram
Slip Ratio
Apparent Slip Ratio
Propeller behind hull
\( S_A=1- \dfrac{V}{P_n} \)
V - ship velocity
[m/s]
Often recorded in logbooks
Escorregamento Menor
Veloc Ship > Veloc Advance
\(P_n=\) Passo x Veloc Rotação
[m] x [RPS] = [m/s]
Real Slip Ratio
\( S_R=1- \dfrac{V_A}{P_n} \)
Real guide
for ship performance
Requires
knowledge of
effective wake fraction
Pn - distance for n-revolutions
When propeller rotating n-revolutions
Will not advance distance LM
\(P_n=[m/s]=LM/time \)
Will advance distance smaller
Because of thrust developed
distance LS
\( V_A=[m/s]=LS/time \)
The ratio \( \dfrac{LM-LS}{LM} \)= Slip Ratio= \( \dfrac{P_n-V_A}{P_n} \)
