Marine Engineering Toolbox
Hull Resistance, Propeller
& Engine Powering
A free, browser-based naval architecture toolbox for calm-water resistance, Wageningen B-series propeller sizing and ship power prediction. Works offline — no data leaves your computer.
Select a module
Resistance
Hull Resistance
Calm-water total resistance and effective power (EHP) from hull dimensions using the Holtrop–Mennen regression.
Open Resistance toolPropeller
Propeller Sizing
Wageningen B-series open-water curves and a first-cut propeller diameter/pitch design from thrust loading.
Open Propeller toolPowering
Engine Powering
Effective → delivered → shaft → brake power with hull, open-water and shaft efficiencies and engine/sea margins.
Open Powering toolSpeed–Power
Speed–Power
Speed–power curve, required power at a target speed, and achievable speed at an available power.
Open Speed–Power toolNavStudio Benchmark
NavStudio Benchmark
Quantified resistance and powering-chain comparison against NavStudio-type reference values for published hulls.
Open benchmarkBuilt for real engineering workflows
✓Engineering-grade regression methods
🌐9 interface languages, auto-detected
◇Metric & Imperial units
⇲Export / import project as JSON
↯Works online & offline
Methods used
- • Total resistance: Holtrop–Mennen (1982)
- • Friction: ITTC-1957 line (CF = 0.075/(log10 Re − 2)²)
- • Propellers: Wageningen B-series Kt–Kq polynomials
- • Interaction: Taylor wake fraction, Hankel thrust deduction
- All estimates are approximate. Always confirm with model tests or a design office before finalizing a design.