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Mariner's Formulae Quick reference guide
Propeller Slip
 
SLIP

Slip = 100% - Efficiency

Efficiency = observed speed or distance
                   engine speed or distance

Mean Apparent Slip = distance run by propeller - distance run by ship
        per Day                          distance run by propeller

Dist. run by propeller in n.m. = pitch [m] x total engine revolution per day
                                                                    1852

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