Calculate appendage resistance (Rapp) (kN) from the Holtrop & Mennen method.

calcHMAppendageRes(
  shipSpeed,
  Cf,
  appendagesList,
  wettedAppSAList,
  seawaterDensity = 1.025
)

Arguments

shipSpeed

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

Cf

Frictional resistance coefficient (vector of numericals, dimensionless) (see calcCf)

appendagesList

List of appendages on ship (vector of strings)

  • "rudder behind skeg"

  • "rudder behind stern"

  • "twin-screw balance rudders"

  • "shaft brackets"

  • "skeg"

  • "strut bossings"

  • "hull bossings"

  • "shafts"

  • "stabilizer fins"

  • "dome"

  • "bilge keels"

wettedAppSAList

List of wetted surface areas corresponding to list of appendages (vector of numericals, m^2)

seawaterDensity

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

Value

Rapp (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

calcHMAppendageRes(seq(1,5,1),0.0015,"rudder behind skeg",50,seawaterDensity=1.025)
#> [1] 0.05765625 0.23062500 0.51890625 0.92250000 1.44140625
calcHMAppendageRes(seq(1,5,1),0.0015,NA,0,seawaterDensity=1.025)
#> [1] 0 0 0 0 0