Wake Fraction (Harvald 1983)
Closed-form Harvald estimate of the Taylor wake fraction w from block coefficient - single- and twin-screw variants.
Wake fraction w
0.360 -
Thrust deduction t
0.226 -
Formula, assumptions, and limits
Simple Harvald 1983 closed-form; for fine hulls with bulbous stern the model-basin result is lower (10–15 %). Thrust deduction t is correlated to w via Harvald's second curve: t ≈ 0.60 w + 0.01.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Block coefficient | - | hydrostatic table | |
| Taylor wake fraction | - | result | |
| Thrust deduction (correlated) | - | result |