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Clements Marine manufactures a large number of rudder profiles to suit the individual hull, ranging from slow speed displacement boats to 'deep vee' planing designs, and covering many other applications.The principal designs are shown above and include dagger type, conventional spade and wedge profile rudders.
Rudder design is of paramount importance to the performance of the boat, especially for high speed craft. Steering performance must be optimised, whilst drag is kept to a minimum. Clements Marine's experience will help the boat designer optimise conditions both in terms of high speed directional sensitivity, and low speed manoeuvrability.
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As every rudder stock is different, we always produce them to the specific customer requirements. In general the designer of the yacht specifies the material and dimensions. We can be of assistance if a calculation for a different material is required or if the design has to be modified for a more economic production. In a lot of cases designers draw a rudder shaft with a maximum diameter rounded off to a full figure (i.e. Ø 70, Ø 80, Ø 90,etc mm). It could be that the calculated diameter is 2 mm less. This is a very costly round off that is completely unnecessary: To achieve a high tolerance surface of Ø 90 mm we would need to use a 100 mm solid bar profile. If the diameter of the rudder stock would be 88 mm, we could use a 90 mm solid bar profile. As the price of bar material goes up exponentially with the diameter, one can save a lot of money by acquiring the exact calculated diameter from the designer.
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RUDDER POSTS
Rudder posts can be ordered individually or with blade and bearing assembly.
Each rudder post consists of a hand-wound, custom designed shaft of uni-directional carbon tape thermally step-cured over aluminum mandrels.
Composite bearing journals are bonded to the shaft and turned to the desired diameters. Shafts can be either round or rhomboid shaped for flatter profile. All shafts are engineered to customer requirements and ABS standards where applicable.
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