Marine Hull Resistance: SWATH|Cb0.45|Rn10e8.0
Ship hull resistance coefficients for resistance prediction: ITTC 1957 friction line, Schoenherr line, Holtrop-Mennen form factors, residuary and wave-making resistance coefficients, and total resistance coefficients. Covers displacement monohulls, planing hulls, catamarans, SWATH, sailing yachts, and barges across Froude numbers 0.10–2.00.
| hull type | Froude number | Cf ITTC57 (dimensionless) | Cf Schoenherr (dimensionless) | Reynolds number log10 (dimensionless) | appendage allowance pct (%) | beam draft ratio (dimensionless) | block coefficient Cb (dimensionless) | correlation allowance Ca (dimensionless) | form factor 1 plus k (dimensionless) | length displacement ratio (dimensionless) | notes | residuary resistance coefficient Cr (dimensionless) | roughness allowance Cf (dimensionless) | total resistance coefficient Ct (dimensionless) | wave making coefficient Cw (dimensionless) | wetted surface coefficient (dimensionless) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SWATH|Cb0.45|Rn10e8.0 | 0.2 | 0.001985 | 0.00201 | 8 | 25 | 1.2 | 0.45 | 0.0004 | 1.3 | 9 | SWATH — Small Waterplane Area Twin Hull; low Cw due to slender struts; high wetted surface coefficient; appendage allowance includes strut and pod resistance | 0.0005 | 0.0004 | 0.003285 | 0.0005 | 3.8 |
| SWATH|Cb0.45|Rn10e8.0 | 0.3 | 0.001985 | 0.00201 | 8 | 25 | 1.2 | 0.45 | 0.0004 | 1.3 | 9 | Fn=0.30 SWATH; excellent seakeeping but higher resistance than displacement monohull | 0.0008 | 0.0004 | 0.003585 | 0.0008 | 3.8 |
| SWATH|Cb0.45|Rn10e8.0 | 0.4 | 0.001985 | 0.00201 | 8 | 25 | 1.2 | 0.45 | 0.0004 | 1.3 | 9 | Fn=0.40 SWATH; slender strut wave pattern still low | 0.0015 | 0.0004 | 0.004285 | 0.0015 | 3.8 |
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displacement_monohull|Cb0.75|Rn10e8.03 rowsdisplacement_monohull|Cb0.60|Rn10e8.03 rowsdisplacement_monohull|Cb0.68|Rn10e7.53 rowsdisplacement_monohull|Cb0.56|Rn10e8.33 rowsdisplacement_monohull|Cb0.82|Rn10e8.53 rowsplaning_hull|Cb0.45|Rn10e7.53 rowsplaning_hull|Cb0.42|Rn10e7.03 rowscatamaran|Cb0.50|Rn10e8.03 rowscatamaran|Cb0.48|Rn10e7.53 rowssailing_yacht|Cb0.38|Rn10e7.03 rowsbarge|Cb0.90|Rn10e8.03 rows