SOLAS Steering Time, Rudder Torque, Ram Force, Hydraulic Pressure, Pump Flow, Motor Power & Alternative Steering Power
Ship Steering Gear, Rudder Torque, Hydraulic Power & Pump Capacity Tool
Convert an approved rudder design torque into ram force, hydraulic pressure, pump flow, steering time and hydraulic motor power. Screen the 28-second main-steering requirement, the 60-second auxiliary requirement, power-operated steering triggers and alternative-power requirements. Advanced mode adds a hydrodynamic torque estimate, detailed actuator geometry, individual power-unit capacity, N-1 performance, pressure-envelope checks, auxiliary steering and emergency-source endurance.
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Need much more depth? Click Advanced above.
Add hydrodynamic rudder-torque estimation, detailed ram geometry, individual power units, N-1 timing, auxiliary steering, alternative power, pressure-envelope checks and readiness.
Vessel & Steering Requirement
Simple mode starts from the approved or project rudder design torque. If that value is not available, Advanced can generate a clearly labeled hydrodynamic screening estimate.
knots.
mm, excluding strengthening solely for navigation in ice.
kN·m at the governing main-steering condition.
Actuator & Main Hydraulic Package
m effective moment arm.
cm² total pressure area producing steering force.
litres for the 65° SOLAS main-steering travel.
L/min from all main steering pumps operating in the trial configuration.
bar at the required steering flow.
Rudder Torque Basis
m².
kg/m³.
Use approved CFD, model-test or designer data where available.
m.
% planning margin applied only to the hydrodynamic estimate.
kN·m. 0 uses V² scaling from the selected main torque as a planning estimate.
Detailed Actuator Geometry
% of ideal force × radius converted to rudder-stock torque.
mm.
mm.
L. 0 uses the Simple entered 65° sweep volume.
L. 0 scales the 65° volume by 30/65.
% delivered pump flow converted to useful actuator flow.
% for motor input-power screening.
Main Steering Power Units
L/min each.
bar.
kW.
Piping / unit failure can be isolated so steering is maintained or speedily regained.
Auxiliary Steering & Alternative Power
L/min.
bar.
kW.
s to automatic availability.
minutes.
kW available to steering gear power unit, controls and indication.
Hydraulic Pressure Envelope
bar.
bar.
× maximum working pressure. 1.25 matches the cited current ClassNK rule, but verify applicable class.
% above calculated steady actuator pressure. Ship Universe planning input, not a SOLAS limit.
Engineering Readiness
Steering-gear screening only: this tool is not a class-approved rudder-load calculation, steering-gear scantling, hydraulic transient analysis, fatigue assessment, relief-valve sizing, single-failure analysis, electrical protection study, SOLAS survey, steering trial or OEM guarantee. Rudder type, hull wake, propeller race, cavitation, astern loading, actuator kinematics and real pump curves can materially alter the actual design case.