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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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RUDDER ASSEMBLIES WITH BLADE
Rudder components can be assembled at our factory with a custom designed CNC machine rudder blade. The blade generally consists of a ribbed, foam core substrate covered with precisely engineered layers of carbon and glass epoxy. The finished blade is primed and ready to paint.
We provide and install bearing races, bearings, shaft seals, tiller plugs and a bearing housing tube ready for installation into the hull and glassing in-place.
We can also incorporate additional features such as a kelp-cutter.
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OUR RUDDERS ARE ESPECIALLY STUDIED TO OFFER RELIABILITY, EASY MAINTENANCE AND COVER ALL RANGE OF APPLICATIONS.
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RWO Rudderheads, tillers and extensions are renown for their reliability world-wide. They are all designed to steer a sailboat positively in all aspects of sailing and wave conditions whether by Olympic yachtsman or absolute novice.
The Rudderheads offer a multitude of features that probably make them the stiffest, lightest, strongest in the world. Two ranges of RWO Rudderheads are available - one to suit fixed tillers, and the other for convenient detachment, has an extruded hood. Both cover standard blade widths and are suitable for a range of dinghies and dayboats. The inbuilt rigidity gives the helm the positive control of a fixed rudder with the convenience of a lifting blade.
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NEW RUDDERS DESIGNED TO IMPROVE PERFORMANCE OF HOBIE CAT 18 17 20 21
A little as a Funboard fin which is easy to change, we revised and innovated in the too often damaged and outmoded rudders.
On most of multihull boats, these rudders are very easy to replace: 2 screws to undo and here you are, equipped with new, light and successful profiles which will increase perf and make your boat easier to sail.
Strong light construction with inside carbon beam. Red end to have better visibility when upside down
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Blade Rudder 420
With wood center, covered with 220 gr.de roving, 150 gr. of mat and epoxi
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We manufacture many kinds of daggerbags: for blades, for centerboards, combo-bags etc.
We particularly have 2 very nice models, for Laser & for Optimist.
All are manufactured in a nice and strong ripstop 600D polyester PVC backed, padded with non-hydro foam.
We can study your own model.
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The 41000 series Jefa rudder bearings are the first type of roller bearings that were produced by Jefa marine. In the past 20 years more than 10.000 of these bearings have been produced. This bearing is typically suitable for GRP or wood core cruising yachts where a light revolving and backlash free rudder system is required that will not be stretched to the limits as on racing yachts.
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These rubber lined bearings are specially designed for water lubricated sterntubes and rudder stocks. The nitrile rubber bearing material gives the bearing a high resistance to abrasion and wear whilst providing effective noise and vibration insulation.
The bearing's outer shell is manufactured from either corrosion resistant naval brass or non-metallic material. The non-metallic shell has the advantage of being lighter and it prevents electrolytic corrosion. Non-standard sizes and flange bearings are available on request.
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Tides Marine manufactures a wide variety of rudder bearings, rudder sleeves, rudder tubes and rudder ports (with and without seals). This product line provides builders, engineers, naval architects and repair facilities with solutions to most any problem they may encounter.
Most of these Rudder Bearing products are precision-machined from UHMW-PE, an ultra-high molecular weight polyethylene. UHMW is extremely durable, abrasion resistant and does not absorb water. It's coefficient of friction (when water-lubricated) approximates that of Teflon in these bearing products.
Tides Marine rudder bearings carry American Bureau of Shipping and Lloyds Register Type Approval.
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Fuel savings and a reduction in emissions can be achieved with Wärtsilä Energopac. This is an integrated propulsion and steering system which increases the propulsion efficiency, but does not compromise on manoeuvring characteristics and comfort levels. Energopac includes a special propeller design, a sophisticated high-lift flap rudder equipped with an efficiency bulb and a special fairing cap connected to the propeller hub. The bulb and fairingcap work together to streamline the water flow behind the propeller while the twisted leading edge and rudderflap reduce rudder drag. Depending on the 11 specific application, the power savings and emissions control with Wärtsilä Energopac may result in operational savings of up to 9%.
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MACOR Marine is a well-established supplier of rudder systems for vessels of all types and sizes.
Presently, our rudder product range includes the following designs for single or twin-screw propelled vessels:
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SCHOTTEL Rudderpropellers (SRP) are combined propulsion and steering systems rated at up to 6000 kW, which convert the engine power into optimum thrust. As the underwater components can be steered through 360 degrees, the full propulsive power can also be used for manoeuvring and dynamic positioning of the ship.
Maximum manoeuvrability, optimum efficiency, economical operation, space-saving installation and simple maintenance - these are just a few of the outstanding features of this robust and reliable propulsion concept, which has proved its worth under tropical and arctic conditions in vessels of all kinds all over the globe.
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Stabilizer
Rudder Roll Stabilization (RRS)
Owing to its fast rudder rates, the Simplex-Compact rotary vane steering gear is well suited to stabilizing ships through rudder action. Today, there are 22 units in operation on ships of the Netherlands, Korean and German Navies.
In collaboration with our longstanding partners, we offer turnkey systems that include the rudder and autopilot with integrated RRS control.
Benefits:
- Substantial roll-damping performance with unrestricted manoeuvrability
- Small size and weight
- Low capital expenditure
- Reduced installation and life cycle costs
- High system reliability and availability
- Reduction of the underwater signature
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SCHOTTEL Rudderpropellers (SRP) are combined propulsion and steering systems rated at up to 6000 kW, which convert the engine power into optimum thrust. As the underwater components can be steered through 360 degrees, the full propulsive power can also be used for manoeuvring and dynamic positioning of the ship.
Maximum manoeuvrability, optimum efficiency, economical operation, space-saving installation and simple maintenance - these are just a few of the outstanding features of this robust and reliable propulsion concept, which has proved its worth under tropical and arctic conditions in vessels of all kinds all over the globe.
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RWO'S range of anodised aluminium fittings offer excellent strength, great rigidity, exceptional choice and are lightweight. We also offer electro polished stainless steel fittings and a range of reinforced nylon transom mounts.
Aluminium Rudder Fittings come in three widths with a choice of length and pintle diameter plus optional packing pieces.
Aluminium Transom Mounts and our reinforced nylon mounts have 2 pintle diameters and two or four hole fixing. The transom/pivot distance is 15mm (9/16") which can be increased by the use of packing pieces.
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