Thrust Deduction - Holtrop Approximation
Thrust-deduction fraction t from the Holtrop-Mennen resistance regression - used to convert propeller thrust to ship resistance.
Thrust deduction t
0.201 -
1 − t factor
0.799 -
Formula, assumptions, and limits
Rough single-screw estimate. Holtrop-Mennen original formula uses more terms including stern shape coefficient. Hull efficiency η_H = (1-t)/(1-w).
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Block coefficient | - | hydrostatics | |
| Beam-length ratio | - | ship particulars |