Calculate bulbous bow resistance (Rb) (kN) from the Holtrop & Mennen method.

calcHMBulbousBowRes(
  shipSpeed,
  maxDraft,
  forwardDraft,
  Abt,
  hb,
  seawaterDensity = 1.025
)

Arguments

shipSpeed

Ship actual speed (vector of numericals, m/s) (see calcSpeedUnitConversion)

maxDraft

Maximum summer load line draft (vector of numericals, m)

forwardDraft

Forward draft (deviation from actual draft indicates trim) (vector of numericals, m)

Abt

Traverse bulb area (vector of numericals, m^2) (see calcAbt)

hb

Center of bulb area above keel line (vector of numericals, m) (see calchb)

seawaterDensity

Sea water density. Default = 1.025 (g/cm^3). Can supply either a vector of numericals, a single number, or rely on the default

Value

Rb (vector of numericals, kN)

References

Holtrop, J. and Mennen, G. G. J. 1982. "An approximate power prediction method." International Shipbuilding Progress 29.

See also

Examples

calcHMBulbousBowRes(seq(1,5,1),13.57,13.57,25.09,5.43,seawaterDensity=1.025)
#> [1] 3.290392e-06 2.498191e-05 7.766593e-05 1.656017e-04 2.859400e-04