Three-dimensional extrapolation form factor (1+k) derived from low-Fn resistance data - the ITTC-78 correction that separates frictional from residual resistance.
Formula
$$ 1 + k = 0.93 + 0.4871 \cdot (B/L)^{1.07} \cdot (T/L)^{0.46} \cdot (1 + C_B)^{0.36} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $C_B$ | Block coefficient | - | hydrostatics |
| $B/L$ | Beam-to-length ratio | - | particulars |
| $T/L$ | Draft-to-length ratio | - | particulars |
| $1 + k$ | Form factor | - | result |
Sources
- Prohaska (1966) - Form factor for ship extrapolation.
- ITTC 7.5-02-02-01 Resistance Test.