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Wake Fraction (Harvald 1983)

Closed-form Harvald estimate of the Taylor wake fraction w from block coefficient - single- and twin-screw variants.

Propulsion
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Formula, assumptions, and limits

wsingle=0.5CB0.05,wtwin=0.25CB0.05w_\text{single} = 0.5 C_B - 0.05, \quad w_\text{twin} = 0.25 C_B - 0.05
SymbolMeaningUnit
CBC_BBlock coefficient
wwTaylor wake fraction
ttThrust deduction (correlated)

Source: Harvald - Resistance and Propulsion of Ships (1983)

In short

Closed-form Harvald estimate of the Taylor wake fraction w from block coefficient - single- and twin-screw variants.

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