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Steering gear

Rotary vane steering gear for smaller vessels

Typical applications: • Work boats• Fishing vessels• Offshore supply vessels• Chemical/product tankers• LPG tankers• Smaller naval & coastguard vessels and auxiliaries• Smaller cargo vessels• Smaller passenger vessels• Yachts

The SR series is designed with integrated frequency controlled pumps.

Rolls-Royce supplies a complete range of steering gear, suitable for all types and sizes of ships. The products are designed as complete steering systems with the actuator, power pack, steering control, alarm and rudder angle indicating system in mind, and can therefore be delivered with complete control systems, including control panels with start/stop, non-follow-up and follow-up, mode

selection, alarm panels and rudder angle indicators or just a portion of this. The system is also prepared for interface to VDR, ships main alarm system, autopilot, joystick and DP when requested. Due to a wide range of demands, great care has been taken from material selection through construction, in order to meet the strictest quality demands.

General description

Key product benefits• Compact• Low weight• Easy installation• Easy maintenance• High positioning accuracy• No external moving parts• Up to 70º rudder angle

• Available with steering control and rudder angle indicators as one complete system

• Built-in rudder carrier• Polymer sealings internally

for optimal tightness• Simple and robust

components

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The Rolls-Royce series of rotary vane steering gears has been manufactured for more than 60 years, with more than 30 000 machines delivered. The principle of a rotary vane gives more flexibility when choosing the design and types of rudder, thanks to the rudder angles of up to 2 x 70º.

The rotary vane principle also ensures a constant torque throughout the steering sequence, providing the gear with maximum power output at all rudder angles. This makes navigation through narrow straits or busy shipping channels safer, because maximum torque and steering time can always be achieved, resulting in improved manoeuvrability and improved control. Unique technical solutions ensure very low noise and vibration levels. The compact and simple design reduces weight and the number of components, which in turn secures fast and easy installation of the steering gear. The actuators are mounted directly on the rudder stock, without requiring the use of keys or keyways, facilitating easier assembly and dismantling of the rudder stock. The rudder torque is transmitted by hydraulic coupling or by hydraulic sleeve coupling/expansion rings (for the

smaller machines). The naval series of rotary vane steering gear is designed to meet the highest standards for noise, shock and vibration. For naval applications without Milspec requirements the SR & RV ranges offer reliability and maintainability at low cost for a wide range of applications.

The SR series of steering gearThe SR series is suitable for small to medium-sized vessels. The steering gear is designed with integrated frequency controlled pumps. The pump utilises a reversible hydraulic pump motor together with a frequency converter to reduce the power consumption and to change the speed and the direction of the pump. The design gives smooth starting and stopping of the steering gear, and enables a precise analogue control system. The pump units are mounted directly on the rudder actuator, which lessens the need for piping work on board a vessel. Full frequency control means the pumps and motors are only running when a steering command is given, this reduces the amount of heat generated and leads to a cleaner hydraulic system, improving the lifetime of components.

Std. rudder Max. Max. Max. Weight Max. Max. stock working working mechanical approx. radial axialTYPE dia. (mm) pressure (bar) torque (kNm) rudder angle (deg) (kg) load (kN) load (kN)

SR562L 120 54 16 2 x 61 400 175 104SR562 160 133 40 2 x 61 400 175 104SR622 200 125 70 2 x 71,5 620 400 200SR642 240 125 110 2 x 72 920 600 250SR662 280 125 170 2 x 72 1800 700 354SR722 300 125 275 2 x 72 2750 855 370SR723 320 125 412 2 x 44 2800 855 370SR742 340 125 433 2 x 72 3700 1400 480SR743 360 125 650 2 x 44 3750 1400 480

1 2 3 1. Unique technical solutions minimise noise and vibration levels.

2. The pump units are mounted directly on the rudder actuator.

3. Red indicates pressurised oil. Green indicates return oil.

*All rights reserved. All data subject to change without prior notice.

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Integrated propulsion and manoeuvring system

Promas with nozzle

Promas + nozzle For efficient high bollard pull applications

A natural evolution of the successful Promas, this system unites a new type of nozzle with an optimised propeller, hubcap, rudder bulb and a special rudder profile developed to provide very high steering forces yet minimise drag. It meets the requirements for large pulling power at low speed with a high free-running speed in transit. Components are designed to work together in a ducted system, maximising efficiency and minimising disturbances in the water flow both through and around the nozzle. Developed through CFD testing and analysis, the nozzle is a major advance on the profile used in conventional nozzle propeller installations. In a typical anchorhandler propulsion system it will reduce fuel

consumption in transit by 15% or more, and improve bollard pull by around 5%. Depending on the exact requirements the rudder may be either a one-piece design or a medium flap type.

Promas LiteImproving propulsive efficiency is the key in reducing fuel burn, and this simple modification allows vessels already in service to benefit from Promas efficiency gains. There are three areas of modification – welding a prefabricated bulb to the existing rudder, bolting a hubcap to the propeller, and fitting a new propeller or reblading the original. Installation is normally 7-10 days and the payback time can be under 2 years.

Typical applications: • Anchorhandling offshore vessels• Seismic survey• Tugs• Fishing vessels• Multipurpose platform supply vessels• Offshore construction vessels

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1. The leading edge of the twisted rudder is adapted according to the inflow angle from the propeller slipstream.

2. Rudders of a special profile have been developed to provide high steering side forces with minimum drag, either of a one piece or medium flap-type design.

3. The Promas Lite modification allows vessels already in service to benefit from Promas efficiency gains.

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Rudders

Classic rudders

Classic rudderThe classic rudder series, with no rudder angle limitation and optimised profile designs, provides an economical way of improving the manoeuvring capabilities of most vessels. To meet each vessels requirements, we offer tailored solutions that can be integrated as a package together with Rolls-Royce steering gear or as an integral part of the PROMAS – Propulsion manoeuvring system. Furthermore, with few moving parts it is also easy to install and maintain. This ensures your vessel will have optimal reliability, excellent manoeuvrability and low life cycle costs.

For transit speeds the directional stability of the vessel must be considered, we have developed and use advanced computer programs to simulate different manoeuvres such as the IMO criteria (zig-zag test), making it possible to evaluate different rudder sizes and types in order to optimise the rudder design for each vessel.

Type CBfor lower speedsA bulbous profile and large vane end platesimprove low speed manoeuvrability. It sharesthe same profile as the FB flap rudder andis typically used for offshore supply, cargo,fishing and seismic vessels.

Options:• Heel connection module• Wire guard

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Type CMfor medium speedsThe profile is optimised to provide goodmanoeuvrability with propulsive efficiency,with a tapered or rectangular blade,meeting the rudder needs of passengerand cargo vessels. Ideal for use on passenger vessels and cargo vessels.

Options:• Twisted leading edge• Wire guard

2"Rudder Periodic Table" in principle

FB rudderFlap rudder with bulbous profile

CB rudderClassic rudder with

bulbous profileCM rudder

Classic rudder with medium profile

CS rudderClassic rudder with

slim profile

FM rudderFlap rudder with medium profile FS rudder

Flap rudder with slim profile

Estimated equal rudder area Increased propulsive efficiency

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1. Rudder performance comparison, based on same area and aspect rudders in similar conditions.

2. Rudder designs are optimised in accordance with propeller and hull characteristics, in order to meet owner requirements for efficiency and manoeuvrability.

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Rudders

Classic rudders

Type CSfor higher speedsThe slim profile increases overall propulsive efficiency and reduces cavitation risk. The blade is tapered with rounded corners. It has the same profile as the FS flap rudder.Ideal for use on passenger vessels, cruise ships, cargo carriers and high speed vessels.

Options:• Twisted leading edge• Wire guard

Key product benefits Available options:• Easy installation• Easy maintenance• Custom-built to fit hull• Optimal performance• Suits all steering gear

• Steering gear foundation• In-water-survey• Automatic lubrication system• Cathodic corrosion protection • Custom rudder trunk • Heel connection module

• Hydraulic nut for steering gear• Water lubricated bearing • Ice class• Special bearings • Stainless steel liners• Wire guard

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Rudders

Flap rudders

Flap rudders Our flap rudder series provides both excellent low speed manoeuvring performance and high propulsive efficiency. A Flap rudder produces more sideforce than a classic rudder of equivalent size. Depending on shipowner requirements, a flap rudder may be used to reduce the overall area of a rudder whilst maintaining equal lift forces or may be used whenever there is a requirement for high manoeuvrability. Therefore a good understanding of Shipowner requirements is vital when designing a rudder.

As a supplier of both rudders and propellers, Rolls-Royce uses experience in cavitation prediction and hydrodynamics, generated from in-house model testing and in collaboration with leading European test centres, in order to optimise and document the manoeuvring performance of our rudders at low speeds. The r udders can also be optimised for higher speeds and the leading edge of the rudder can be twisted to improve the efficiency and cavitation characteristics of the rudder.

Type FBfor low to medium speedsThis rudder has a bulbous profile formaximum manoeuvring performance. Thedesign also has large upper and lower vaneplates. It is ideal for use on workboats, fishingvessels, offshore vessels, small tankers, cargovessels, ferries and other coastal vessels.

Options:• Heel connection module• Wire guard

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Rudders

Flap rudders

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Type FMfor medium speedsDesigned with a moderate profilefor enhanced manoeuvrability andpropulsive efficiency. Ideal for use on passenger vessels and cargo vessels.

Options:• Twisted leading edge• Wire guard

1. The leading edge of the medium and slim rudders can be twisted to improve efficiency and cavitation performance and to improve the manoeuvring performance of the rudder at low-speeds.

2. Trunk type: extended, with steering gear foundation or standard. Designed for minimum installation time and cost. The extended trunk is available with or without fairwater/shell plating.

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Type FSfor medium to high speedsA slim profile that is purpose-designed to suitthe vessel. The rudder is built around a castcone module and has a robust link mechanismand hinge system to withstand the high forces.It is also an ideal all-round flap rudder suitablefor a wide range of vessel types.

Options:• Twisted leading edge• Wire guard

Key product benefits• Easy installation• Easy maintenance• Custom-built to fit hull• Optimal performance• Suits all steering gear

Available options:• Steering gear foundation• In-water-survey• Automatic lubrication system• Cathodic corrosion protection • Custom rudder trunk • Heel connection module • Hydraulic nut for steering gear

• Water lubricated bearing • Ice class• Special bearings • Stainless steel liners• Wire guard