Jefa GRP rudder blades
Jefa Marine produces a wide range of standard rudder blades for boats from 22 to 75 feet length. This unique product line offers the boat builder a modern rudder blade without investing in expensive molds. The rudders are made in our modern GRP factory and are available in many sizes depending on the boat size. What makes the Jefa rudder blades unique and distinct from all other rudder blade producers and yard made rudder blades is the production in solid aluminium molds. This unique production method allows very high pressures to be used in the gluing and foaming process and results in an extremely precise end shape. Traditional glass fiber molds don’t allow any pressure from inside the blade, so one can’t be sure of a good bonding of both sides and the final shape of the rudder.
Another unique feature is the overlapping parts of the blades. This feature substantially strengthens the blade integrity making it nearly impossible to split. Traditionally the rudder halves are glued heads on together, allowing only a very small contact area which causes the blade to split easily.
The cross section shown in the picture at the right side perfectly shows all advantages of our unique production method. Due to the high pressure foam filling system, the foam is guaranteed present in all remote ends of the blade so no air pockets can be present. Also well visible is the large overlap at the front and the huge glue contact area at the aft side of the rudder blade.
The left illustration shows the way the Jefa rudder blades are build. The blades are made of one layer of 300g chopped E-glass and 3 layers of 600g. The metal (Aluminium or Stainless Steel – for details see this web page) rudder stock is MIG welded to the spokes which are glued to the rudder blade at each side. On top of that there is extra lamination at one side of 2 layers 600g glass. This extra laminate is very important as any movement between the rudder stock and rudder blade is fatal for the lifetime of the rudder. All rudder blades comply to the ISO 12215-8 norm ( the CE regulations). Please look further on the page for more detailed information on sizes, production methods and specials. All Jefa rudders are delivered in a gel coat finish and should be treated with non-water penetrable epoxy coating and anti-fouled. This will prevent water entering in the gel coat and underlying GRP structure. For detailed instructions, please open this PDF instruction leaflet.
Overview of all available standard CRUISING blades:
The JEFA cruising blades are the perfect solution for modern cruising-racing production boats. The modern blade shape is thick enough to allow aluminium AL6082 rudder stocks which are normally used by production yards, but mounting stainless steel shafts is also possible. Please read more on the different usable materials on our materials page. By adding a solid insert in the mold, the top and bottom shape can be altered easily. Please follow this link for all 2D and 3D CAD data on our rudder blades. Rudder stocks are made to suit customer requirements and are unique for each rudder we make and are priced individually.
| Jefa cruising rudder blade prices:
(prices in EURO excl. VAT and excluding rudder stock)
|
|
|---|---|
| RUD26 | GRP rudder blade 0.49 m², volume 20.3 dm³ |
| RUD29 | GRP rudder blade 0.55 m², volume 24.3 dm³ |
| RUD30 | GRP rudder blade 0.55 m², volume 26.3 dm³ |
| RUD31 | GRP rudder blade 0.60 m², volume 28.3 dm³ |
| RUD32 | GRP rudder blade 0.65 m², volume 32.7 dm³ |
| RUD33 | GRP rudder blade 0.70 m², volume 32.8 dm³ |
| RUD34 | GRP rudder blade 0.70 m², volume 39.3 dm³ |
| RUD35 | GRP rudder blade 0.59 m², volume 27.7 dm³ |
| RUD36 | GRP rudder blade 0.87 m², volume 46.0 dm³ |
| RUD40 | GRP rudder blade 0,92 m², volume 56.7 dm³ |
| RUD46 | GRP rudder blade 1.11 m², volume 77.0 dm³ |
| RUD55 | GRP rudder blade 1.45 m², volume 101 dm³ |
| RUD70 | GRP rudder blade 2.17 m², volume 208 dm³ |
| RUD-MOD | Modification to rudder mold |
| RUD-MOD-S | Simple modification to rudder mold (straight line in top or bottom) |
|
Jefa rudder blades are delivered in a white gel coat finish and for future protection should be treated with non-water penetrable epoxy coating and anti-fouling. Failing to do so invalids the warranty. Read this manual for more info.
|
|
Overview of all available standard RACING blades:
When the budget is not there, but a thin rudder profile like a carbon rudder profile is required, the JEFA racing blades are the best alternative! The profile is as thin as carbon solutions at only a fraction of the costs. In IMS ratings these rudders work great as they are as thin as carbon, but don’t get the heavy rating. As the profile of these rudders is so thin, only high strength stainless steel rudder stocks (AISI630 or 16PH) can be used (so aluminium can’t be used!). The RUD45R and 48R can also accept a stainless 329 rudder stock. Please read more on this material on our materials page. By adding a solid insert in the mold, the top and bottom shape can be altered easily. Please follow this link for all 2D and 3D CAD data on our rudder blades. Rudder stocks are made to suit customer requirements and are unique for each rudder we make.
| Jefa racing rudder blade prices:
(prices in EURO excl. VAT and excluding rudder stock)
|
|
|---|---|
| RUD27R | GRP rudder blade 0.36 m², volume 9.27 dm³ |
| RUD28R | GRP rudder blade 0.37 m², volume 10.2 dm³ |
| RUD30R | GRP rudder blade 0.53 m², volume 20.7 dm³ |
| RUD31R | GRP rudder blade 0.48 m², volume 14.1 dm³ |
| RUD32R | GRP rudder blade 0.69 m², volume 34.3 dm³ |
| RUD33R | GRP rudder blade 0.61 m², volume 20.3 dm³ |
| RUD36R | GRP rudder blade 0.69 m², volume 30.4 dm³ |
| RUD37R | GRP rudder blade 0.75 m², volume 28.6 dm³ |
| RUD39R | GRP rudder blade 0.80 m², volume 34.4 dm³ |
| RUD44R | GRP rudder blade 0.95 m², volume 46.0 dm³ |
| RUD45R | GRP rudder blade 1,03 m², volume 51,1 dm³ |
| RUD48R | GRP rudder blade 1.14 m², volume 64.1 dm³ |
| RUD-MOD | Modification to rudder mold |
| RUD-MOD-S | Simple modification to rudder mold (straight line in top or bottom) |
|
Jefa rudder blades are delivered in a white gel coat finish and for future protection should be treated with non-water penetrable epoxy coating and anti-fouling. Failing to do so invalids the warranty. Read this manual for more info.
|
|
Overview of all available standard CATAMARAN blades:
| Jefa catamaran rudder blade prices:
(prices in EURO excl. VAT and excluding rudder stock)
|
|
|---|---|
| RUDCAT45 | GRP rudder blade 0.57 m², volume 25.0 dm³ |
| RUDCAT50 | GRP rudder blade 0.72 m², volume 30.9 dm³ |
| RUDCAT55 | GRP rudder blade 0.92 m², volume 44.0 dm³ |
| RUD-MOD | Modification to rudder mold |
| RUD-MOD-S | Simple modification to rudder mold (straight line in top or bottom) |
|
Jefa rudder blades are delivered in a white gel coat finish and for future protection should be treated with non-water penetrable epoxy coating and anti-fouling. Failing to do so invalids the warranty. Read this manual for more info.
|
|
Jefa rudder blade CAD data:
Using below link, you will transferred to our FTP document server where you can find 2D & 3D CAD files of our rudder blades. Please don’t hesitate to contact the Jefa commercial team for any specific inquiries.
Jefa rudder production:
