Wind & Current Side Force, Yaw Moment, Tunnel Derating, Thruster kN & Electrical Capacity

Bow & Stern Thruster Sizing, Windage, Thrust, Power & Tunnel Capacity Tool

Turn windage, underwater current load and maneuvering moment into a bow-and-stern thrust requirement. Split force around the vessel's center of rotation, correct for tunnel and forward-speed losses, test candidate thruster kN and kW, screen tunnel geometry and thrust density, check generator reserve, and see where the maneuvering envelope actually runs out.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Vessel & Maneuvering Basis

The environmental-force model is a screening calculation. Project-specific wind and current coefficients, projected areas, centers of effort, tug-assist assumptions and harbor operating limits should come from the naval architect, maneuvering study or operating basis where available.

m
%
kN·m
Positive moment shifts more demand toward the bow. Negative moment shifts more toward the stern.
kN
knots
h/year

Wind Side Force

m²
knots
m +bow
kg/m³
%

Current Side Force

m²
knots
m +bow
kg/m³
%

Bow Thruster Candidate

m
kN
kW
%
%
Enter the project-specific loss at the ship speed above. Tunnel thrusters can lose effectiveness once the vessel has headway.
%
m
m

Stern Thruster Candidate

m
kN
kW
%
%
%
m
m

Thruster Register

Use one row per thruster bank or distinct unit type. Positive lever arm is forward of CG; negative is aft. Rated thrust is static vendor thrust before the entered installation and forward-speed derating. The tool allocates the required bow and stern force to available banks at each end.

Bank / unit End Qty Reserve Lever m Rated thrust kN each Power kW each Tunnel loss % Speed loss % Drive eff % Diameter m Tunnel L m

Electrical Capacity & Operating Cost

kW
kW
kW
$ / kWh
%
Used only for annual energy / cost. Peak sizing uses the calculated maneuvering power.

Tunnel & Installation Screening

kN/m²
Editable project screening threshold, not a universal class limit.
kW/m²
Editable vendor / project screening threshold.

Thruster System Readiness

Maneuvering and equipment screening only: This tool is not a CFD or model-test maneuvering analysis, DP capability plot, class-approved thruster sizing calculation, tunnel hydrodynamic design, cavitation study, structural tunnel design, propeller selection, electrical transient study or OEM performance guarantee. Final thrust and power selection should use naval-architect force / moment data and vendor thrust curves at the actual tunnel geometry, draft, grid arrangement, direction and vessel speed.
Design context: Transverse tunnel thrusters generate side force for harbor maneuvering and station keeping. Useful thrust depends on more than motor kW: propeller design, tunnel geometry, grids, hull interaction, installation losses and vessel headway can materially change effective force. The tunnel L/D band, thrust-density limit and power-density limit in this tool are editable screening inputs, not class or OEM limits. Use current OEM thrust curves and naval-architect maneuvering data for procurement.
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