Crosswind Side Force, Bow/Stern Thrust Split, Tunnel Jet Loading, Shaft Power, Headway Loss & Generator Capacity
Bow & Stern Thruster Sizing, Windage, Thrust, Power & Tunnel Capacity Tool
Turn a berth-maneuvering crosswind into required side thrust, split it between bow and stern, estimate static tunnel jet velocity and shaft power, and test the installed thrust and power package. Advanced mode adds transverse current, force and yaw-moment balance about CG, separate bow/stern lever arms, installation and forward-speed losses, detailed tunnel screening and generator reserve.
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Need much more depth? Click Advanced above.
Add current force, force/moment balance about CG, separate bow/stern lever arms and tunnels, vendor thrust/power, installation losses, headway losses, generator reserve and tunnel screening limits.
Fast Crosswind Thruster Screen
Simple mode is deliberately a zero-headway crosswind sizing screen. Advanced is the correct mode for current, yaw moment, separate bow/stern geometry and vendor installation losses.
m².
knots.
%.
%. Stern takes the balance.
m.
% used only in the axial-flow momentum power screen.
kN after known installation losses.
kN after known installation losses.
kW aggregate motor nameplate for the modeled bow + stern package.
Environmental Force & Moment Basis
kg/m³.
%.
m, positive toward bow.
m².
knots.
kg/m³.
%.
m, positive toward bow.
kN, positive in same direction as wind/current.
kN·m, positive shifts demand toward bow.
m.
m magnitude aft of CG.
knots. Actual effectiveness loss remains a project/vendor input below.
Bow Thruster Candidate
kN.
kW.
%.
% at the entered ship speed.
%.
m.
m.
Stern Thruster Candidate
kN.
kW.
%.
% at the entered ship speed.
%.
m.
m.
Electrical Capacity & Operating Cost
kW during maneuvering.
kW.
kW.
Planning multiplier for peak bus sizing. Not a universal class factor.
h/year.
% of modeled peak electrical demand.
Selected currency / kWh.
Tunnel & Installation Screening
Editable project/vendor screen.
Editable project/vendor screen.
kN/m², editable project threshold.
kW/m², editable vendor/project 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, tunnel structural 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.