Flow-Aligned Rudders

Flow-Aligned Twisted Rudders

Although traditionally motor yacht rudders have a straight surface area, they operate in a position 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 and craft a rudder blade with a unique ‘twisted’ profile – one which is perfectly aligned with the propeller flow angles along the entire span.

Key Features of Twisted Rudders

At CJR, we pride ourselves on producing expertly-designed, durable and attractive rudders that have a considerable impact on fuel consumption and maximising boat speed. Highlighted below are some of the top features specific to twisted rudders, to help you consider the best options for your motor yacht:

• Up to 2kts increase in speed compared to top straight 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 also able to satisfy any required construction approach, with experience across all major steering system methods.

Proven Performance Enhancement

Flow-aligned twisted rudders have been proven to work more efficiently with the flow of water when compared with standard rudders. A recent case study revealed increased boat speed throughout the rev range and an approximate speed gain of one knot at wide open throttle.

Read more about standard rudders, common issues and FAQs here.