Ship Steering Gear, Rudder Torque, Hydraulic Power & Pump Capacity Tool

Rudder Force, Stock Torque, Ram Force, Hydraulic Pressure, Pump Flow, Motor kW & SOLAS Steering Time

Ship Steering Gear, Rudder Torque, Hydraulic Power & Pump Capacity Tool

Estimate rudder force and stock torque, convert torque into ram force and hydraulic pressure, calculate cylinder oil volume, main and auxiliary pump flow, motor kW and steering time, compare power-unit packages, and screen SOLAS redundancy and alternative-power triggers.

Currency

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

Vessel & SOLAS Basis

Timing screens use SOLAS II-1/29. The hydrodynamic torque is a screening estimate. Enter an approved class / designer / OEM torque override when available.

Ship type

Gross tonnage

Maximum ahead service speed, knots

Required rudder-stock diameter at tiller, mm Excluding strengthening solely for navigation in ice.

Alternative steering-power transfer, s

Alternative power endurance, min

Rudder Hydrodynamic Load

Rudder planform area, m²

Water density, kg/m³

Normal-force coefficient Cn Use approved rudder / CFD / towing-tank data where available.

Center-of-pressure lever from stock, m

Hydrodynamic design margin, %

Approved main rudder torque override, kN·m 0 = use hydrodynamic estimate.

Ram, Tiller & Cylinder Geometry

Effective tiller / actuator radius, m

Mechanical leverage effectiveness, %

Active powered rams / chambers

Ram bore, mm

Ram rod diameter, mm

Pressure area

Stroke / arc geometry factor, %

Pressure design margin, %

Volumetric efficiency, %

Default pump / drive efficiency, %

Motor service margin, %

Main Steering Power Units

Installed main power units

Main units normally online

Pump flow per main unit, L/min

Maximum hydraulic pressure, bar

Motor rating per unit, kW

Main steering package / retrofit cost

Main Power-Unit Candidate Register

Compare candidates against the same torque, pressure and steering-time requirement. One-unit-out capacity is shown separately from normal capacity.

Candidate	Installed	Online	Flow each	Max bar	Motor each	Eff %	Cost

Auxiliary / Emergency Steering Unit

Auxiliary steering arrangement

Auxiliary pump flow, L/min

Auxiliary max pressure, bar

Auxiliary motor, kW

Steering-Time & Power-Supply Screen

Main benchmark

Custom main travel, degrees

Custom main max time, s

Auxiliary benchmark

Custom auxiliary travel, degrees

Custom auxiliary max time, s

Annual full-angle steering equivalents

Electricity cost

Engineering Readiness

Approved rudder torque available Replace simplified hydrodynamic torque for final sizing. Ram geometry confirmed Bore, rod, lever and force angle reflect the actual steering gear. Relief / design pressure verified Piping and component ratings close the pressure case. Steering-trial basis confirmed Draught, speed and accepted trial condition are documented. Independent controls / alarms checked Bridge, steering room and power-failure paths are mapped. Alternative steering power checked Where triggered, transfer, endurance, controls and rudder indication are verified.

Engineering screening only: This tool is not a class-approved rudder-force calculation, steering-gear scantling, hydraulic transient analysis, fatigue assessment, relief-valve setting, electrical protection study, SOLAS survey, steering trial, single-failure analysis or OEM guarantee. Hull wake, propeller race, rudder type, cavitation, astern conditions and actuator geometry can materially change actual steering loads.

Reference basis: SOLAS II-1/29 screens the main steering gear from 35° on one side to 30° on the other in not more than 28 s under the specified deepest-draught / maximum-service-speed condition. Auxiliary steering is screened from 15° to 15° in not more than 60 s at half maximum ahead service speed or 7 knots, whichever is greater. A rudder-stock diameter over 230 mm in way of the tiller triggers alternative steering power, automatically available within 45 s, with at least 30 min endurance at 10,000 GT and above and 10 min below 10,000 GT. Tankers, chemical tankers and gas carriers at 10,000 GT and above, and other ships at 70,000 GT and above, have additional multiple-identical-power-unit provisions. IMO survey guidance · DNV Rules & Standards Explorer.

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