Calculate form factor (1+k_1) from the Holtrop & Mennen method.

calcHMFormFactor(
  maxDraft,
  lwl,
  breadth,
  maxDisplacement,
  Cp,
  Cstern = 0,
  lcb = 0
)

Arguments

maxDraft

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

lwl

Waterline length (vector of numericals, m) (see calclwl)

breadth

Moulded breadth (vector of numericals, m)

maxDisplacement

Maximum ship displacement (vector of numericals, m^3)

Cp

Prismatic coefficient (vector of numericals, dimensionless) (see calcCp)

Cstern

Afterbody form coefficient:

  • U-Shaped Hull = 10

  • Normal Hull = 0 (default)

Can supply either a vector of numericals, a single number, or rely on the default

lcb

Longitudinal position of center of buoyancy (vector of numericals, see calclcb)

Value

formFactor (vector of numericals)

References

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

Holtrop, J. and Mennen, G. G. J. 1984. "A Statistical Re-Analysis of Resistance and Propulsion Data'.

See also

Examples

calcHMFormFactor(c(13.57,11.49),c(218.75, 209.25),c(32.25,32.20),c(80097,52382.04),c(0.81,0.67))
#> [1] 1.275601 1.184795
calcHMFormFactor(13.57,218.75,32.25,80097,0.81)
#> [1] 1.275601