Rudder profile and sections are carefully selected to specific regime of the flow around sterngear. Streamline low drag sections are used for low and medium speed vessels and wedge sections for high speed boats to prevent early stalling. Rudders can be tailored to the hull using the latest design techniques including CFD to determine the accurate flow into the rudder from working propeller. 

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Detailed hydrodynamic loading is calculated to assess rudder stock and blade strength by FEA as well as supporting bearings reactions. Design and manufacture can be done to any classification society rules including all IACS societies. More about overall design process here.



Cast rudders are made using our precision tooling and cast in either aluminium bronze or high tensile bronze.

Rudder Cell

  • Balancing 350 kgs of a spinning Aluminium Bronze rudder takes years of development and experience combined with the latest technology.
  • We deploy a cell of 3 axis CNC lathes that are dedicated to machining our range of cast rudders in a single set-up. They are capable of machining rudders weighing from 20kg to 350kg.

Fabricated single plate or streamlined shape rudders are manufactured and welded in stainless steel, mild steel or aluminium.

  • Fabricated Welding Cell
    • Capabilities for welding Marinemet 25 to 316L stainless steel to reduce stock size.
    • Coded welders are employed for products requiring IACS approval.
    • Full NDT on all welding.

All castings are finished to the highest standard and can be IACS approved when required. 
Rudders can be supplied with their full assembly items such as tillers, jump collars and tubes.


Most common method of rudder installation inside the boat is a rudder tube accompanied with bearings, jump collars and wear plates.
For some boats with limited aft space, transom hung rudders can be utilised. They are fixed to the boat by a transom hung housing.


Aftersales support

CJR can help to assess rudder performance and solve a problem with any rudder that is stalling or underperforming.
TrialAPP is capable of measuring turning radius, rate of turn and boat speed during the turn, and therefore can assess the performance of the rudder at various speeds.
We can also repair or replace any rudder if damaged.


Related Products

Bearings, Tillers, Rudder tubes

  • Bearings

    Suitable bearings are required in stern tube and rudder tube assemblies.

  • CJR Propellers

    Every boat is different and the first sign of this difference can be seen in propeller operation.

  • Couplings

    Couplings are the elements that transfer torque from gearbox to the shaft and because of their role they are under strict supervision of class societies.

  • Ducted Propellers / Nozzles

    CJR can offer ducted propellers systems including any type nozzles and impellers under full IACS approval.

  • Rudder Tubes Assemblies

    CJR manufactures rudder tube assemblies designed for hull trough installation to suit stock diameter from 30mm up to 180mm.

  • Rudders

    Rudder profile and sections are carefully selected to specific regime of the flow around sterngear.

  • Shaft Brackets

    Our shaft brackets are designed bespoke to achieve optimum performance in line with every vessel individual requirements.

  • Shaft Seals

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  • Shafts

    Shaft design starts from designing entire shaftline incorporating all the components from the propeller to the gearbox and including the bearings to make the system safe, vibration free and efficient in operation.

  • Stern Tubes / Shaft Logs Assemblies

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  • Tie Bars

    Tie bars connect both rudder tillers on twin rudder boats to simply synchronise them together.

  • Tillers

    Tiller is important part of steering gear which design is covered by strict rules of classification societies when the boat is built under class.

  • Shaft Alignment

    Using laser technology and precision engineering a bespoke shaft alignment tool has been developed to aid the boat builder’s task of accurately fitting and aligning the stern gear.

  • PropSmith

    For the fast, simple and precise installation and removal of propellers, PropSmith is the professionals’ choice.

  • TrialDAS

    TrialDAS is a new data acquisition system specifically tailored for monitoring sea trials. The system is based on rate gyros, GPS, accelerometers and magnetic field sensors to record every movement of the boat.

  • Keyless Hub Hydraulic Kit

    Quick and convenient method of pushing and releasing large propellers or couplings to and from the keyless shaft cone.

  • Hydraulic Propeller / Coupling Pusher / Puller

    Quick and convenient method of pushing and pulling propellers or couplings to and from keyed shaft end.

  • TrialsAPP

  • Quality Policy

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  • Design

    We don’t only make propellers, we analyse entire propulsion system of each boat starting from hull resistance prediction and hull propulsive factors.

  • Pattern Making

    Precise pattern assures high accuracy of final product and it is one of the most important stages in manufacturing process

  • Casting

    CJR's foundry team has the combined benefits of over 150 years experience in the industry.

  • Machining

    CAD/CAM controlled machining of the cast propellers, P brackets and rudders are undertaken to the fine tolerances of their original design

  • Finishing

    Our processes ensure that the geometry of our finished castings is always true and accurate to the original design.


Contact Us
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CJR Propulsion Ltd
70-72 Quayside Road
Bitterne Manor
SO18 1AD
United Kingdom

Tel: +44 (0)23 8022 2032
Fax: +44 (0)23 8021 1832