Resistance & propulsion

Estimates calm-water resistance and effective power of conventional displacement monohulls in deep water with the Holtrop–Mennen and Holtrop empirical methods. A supplied open-water curve of a single fixed-pitch propeller can be matched to calculate shaft speed and delivered propeller power at specified ship speeds, with interaction factors that are supplied, estimated, or derived at model scale from a matched model resistance and self-propulsion test. Machinery-limited attainable speed and model-to-ship extrapolation are not calculated. The methods, the inputs the tool refuses and the limits of the validation are stated on the tool's About and Benchmarks & validation pages; the method's papers give no numeric range of application.

Input

Hull particulars and form parameters, entered, derived from a closed STL or OBJ hull mesh or read from a saved setup; for propulsion matching, a propeller open-water curve and interaction factors that are supplied, estimated or derived from a model test.

Runs on

A current web browser, online or as a single file for offline use.

Licence

The OpenNAOE Tool Licence 1.0 for its own code: free to use, not to be modified or redistributed. Third-party components keep their own licences, listed in the tool's notices. Full terms

Release

Version 1.0.0 · DOI 10.5281/zenodo.23817326

All versions

DOI 10.5281/zenodo.23817325

SHA-256 of the file

1442ef3aca3e35fb78e873e401e93382d5a03d50c730e2db9e814aa2e104c31e

This tool supports learning, teaching and early design exploration using established empirical methods, documented equation checks and model-test comparisons. Further validation and matched accuracy comparisons are needed before qualification for real-world engineering use.