Through the use of CFD and FEA design tools, CJR-designed rudders are tailored to your specific hull form and optimised for peak performance and longevity.  With an accurate understanding of the flow into the rudder from the propeller and the hydrodynamic loading, as well as the ability to calculate rudder stock and blade strength requirements and supporting bearings reactions with precision accuracy, CJR provides the finest rudders on the market.

Design and manufacture can meet any classification society rules, including all IACS societies, and rudders can be cast in a range of materials to suit the specific application, with nickel aluminium bronze (NiBral) or high tensile bronze representing the most popular choice of material,  Equally, CJR’s rudders, can be manufactured using a range of alternative approaches to best meet your needs.

Flow-Aligned Twisted Rudders

Although traditionally motor yacht rudders are straight, they operate in an area of uneven water flow directly behind the propellers. As a result, a suction pressure peak can form at or near the leading edge of the rudder. Through another unique CJR innovation, we are able to accurately simulate these forces and can predict how they would impact the propulsion system’s performance. With this comprehensive understanding, we’re able to design a rudder with a unique ‘twisted’ profile – one which is perfectly aligned with the propeller flow angles along the entire span.

Read more about flow-aligned rudders here

Key Features of Twisted Rudders

  • Optimised profile of each rudder delivered through CFD.
  • Significantly improved propulsive efficiency, with no impact on vessel manoeuvrability or steering performance.
  • Reduced rotational losses and minimised drag provide the potential to increase top speed by up to two knots.
  • Power savings provide the opportunity to reduce engine load by up to 3% at the same RPM, in turn significantly reducing fuel burn.
  • Lower suction pressure peaks to reduce cavitation, noise and vibration, improve both ride comfort and rudder lifespan.
  • Potential to downsize the steering rams to save weight and cost.
  • Manufactured to any classification society rules, including all IACS societies.

We are able to satisfy any required construction approach, with experience across all major methods.

  • Of the many elements which make CJR unique and successful, it is the company’s investment in technology which truly sets it apart from the competition.

Custom Assemblies

  • Cast Rudders

    Cast in a single piece in either aluminium bronze or high tensile bronze, before the stocks are fully machined in our CNC machining centre for adherence to the required tolerances and ensuring optimum fit.

  • Bolt on stock

    Bolt on stock rudders follow the same quality-centric approach as our cast rudders but with a bolt on stock for easy replacement and repair of the blade if it gets damaged.  The stock and blade are fitted with flanges with a ring of bolts which usually fits into a recess in the hull to minimise drag.

  • Fabricated

    Fabricated single plate or streamlined NACA shape rudders are manufactured and welded in stainless steel or mild steel and can offer a notable weight saving for large vessels.  All welding is carried out by Class Society coded welders and all our rudder types can be manufactured to major Classification Society requirements

Get in Touch

CJR combines decades of experience with continuous investment in the latest technology and engineering prowess. Just drop us a note to find out more about how we can help you.

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